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#26 Re: Dark Discussions at Cafe Infinity » Make proposals to stopping the oil leakage in the mexican gulf » 2010-06-24 13:52:13

Odd how they don't mention he is a biomedical engineer, not a mechanical engineer.  Also quite clear that the kid is just an actor in his Dad's play, don't you think?

Gotta love American news media!

#27 Re: Help Me ! » Computing Expectation of Negative returns » 2010-06-24 03:50:30

Here is the paper.  I can't find the computation you claim.

Also, be careful George.  You need to assume an infinite amount of real numbers in order to calculate that integral roflol

#28 Re: Euler Avenue » An interesting general article on math in science » 2010-06-20 16:42:38

Bobby, please answer me this:

Consider the quote we've been talking about from Expelled, taken from the Origins by Darwin.  Do you believe Ben Stein's quote is a reasonable approximation to the idea that Darwin was trying to convey in the quote?

#29 Re: Euler Avenue » An interesting general article on math in science » 2010-06-20 16:21:24

You can't be asking me to bolster your arguments. I don't believe there is much you can say. Your position here is indefensible. Kronecker's comments are persecution. What else can I say?

What are you talking about?  I gave you what I felt was his reason, and you rejected it without criticism.  We can't go anywhere until you provide a reason for your rejection.

You are not listening. The comments in the documentary precede the comments in the video you show. They are again, damage control. Dawkins can say whatever he can get people to believe. The fact is,  that is not what he said in the documentary.

Because it's not in the documentary you saw, it's not evidence?  You won't believe a man when he tells you what he believes?  Or is it only Richrad Dawkins?  Whatever, you previously stated "He believes in some form of Intelligent design, just not God," which has been shown to be completely unevidenced.  All he said is that it was possible.

Darwinism is about life here. We have no reason to believe research in the Galapagos holds on some other planet 400 light years from here. We know nothing of any life other  than here. The chemistry may be different, certainly the biology will be very different.   Directed panspermia represents a severe threat to modern biology's present viewpoint.

You got your order all backwards.  If we start with the assumption that life was planted here from a different planet, then it would be expected that the two forms of life would be very similar.  How does panspermia represent a threat to biology at all?

Nope, I didn't leave it out, I said I don't agree. Tailoring arguments is for politicians not scientists. Anyway, he didn't tailor his arguments, he had none. Again when confronted on Intelligent panspermia he was speechless. I have made this point several times. I don't know how to put this, he was whupped real good!

I have explained in numerous ways, given examples, and all you do is say "no".  That isn't an argument.  Scientists tailor what they say all the time.  That you don't accept this is simply a denial of reality.  To imagine a scientist talking at a conference the same way they do at a public lecture is quite funny, when you think about it.

Darwins thesis is not clear. It is a theory! Not a mathematical theorem. In 50 years very likely biologists will be pushing something else.

Darwin's thesis, his point, in the quote was that human sacrifice is a good thing.  You think that isn't clear from the two paragraphs?

I told you Dawkin's video leaves out important parts of their exchange

What important points?

What supporting evidence can I give. I have offered the documentary. It contains the names, the quotes, the scientists both for and against. At the beginning I said watch it yourself. you may decide that I am wrong. That is fine, that is excellent. A person exercising their free will. Not opining what Richard Dawkins has to say.

Alright, let's try this: Imagine I go to watch the documentary.  How will I know when I've reached the point where you think there is a quote mine?

#30 Re: This is Cool » Infinite Iterations » 2010-06-20 15:57:29

Many functions will give counter examples: e^x with x=2, then \tilde{f} = infinity and

#31 Re: This is Cool » Infinite Iterations » 2010-06-20 15:48:18

Some corrects about statements involving Newton's method:

It stands to reason that for any function g (regardless of how we define x_0) we will always find a zero, if it exists.

This is not true.  Quite clearly, the function has to be differential.  But of course I assume that was implied.  However more importantly, Newton's method will only work locally.  For the function

There is only one zero, at x = 0.  For x_0 < 0.5, Newton's method will converge.  For x_0 > 0.5, it will diverge to infinity.  For x_0 = 0.5, it will oscillate between 0.5 and -0.5, never converging.

The best you can say about Newton's method is the following: Converge is guaranteed if g is a differential function with continuous derivative, and x_0 is close enough to the zero, and the derivative at that point is nonzero.

This is how I think you want to define \tilde{f}:

Now it should be clear such a limit doesn't always exist, indeed would be quite rare for most functions.  I'm not sure what A is, you introduce it without saying anything about it.  Is that a recursive definition?  An infinitely recursively defined function is not well-defined.  Then you have the differential equation involving A which you solve, and this would seem to imply that the above is not the definition of A.  So what is it?

Next you assume that A has a zero.  But if A had a zero, then your work in solving the differential equation:

Would be entirely invalid!  You can't simply assume that A has a zero when your work requires you to divide by that zero.

As for your final identity, I don't know if I am reading the symbols correctly, but it doesn't seem to work for f(x) = x at the point x=1.

#32 Re: Euler Avenue » An interesting general article on math in science » 2010-06-20 12:31:49

Yes, but Kronecker was wrong, very wrong. You are not answering my question. Why should Kronecker state that Cantor is a corruptor of children? If you believe that is acceptable criticism of someone's work than it is not likely that I will change your mind. They had no mathematical criticism just personal attacks.

I don't know why Kronecker stated that.  I provided justification that I thought was reasonable (Cantor, by studying the nonconstructible, was corrupting mathematics), but you seem to have rejected it.  What else can I say?

I can't fathom how you thought I was relating James Anderson to George Cantor.

Then why mention it? Are you stating that Kronecker was unable to determine the difference between a James Anderson and a Georg Cantor?

You said: "Remember, we are not talking about math here. Compared to the life sciences, math is pristine."  At the time, it sounded like you were talking about the (non)existence of charlatans in math, for which I wanted to show you an example.  On a second reading, it appears to me you may have been talking about persecution.

Dawkins however does not support this view, as he clearly states.

That's not accurate. In the video you supplied he has no comment after Stein's statement. Same thing in the documentary.

In the clip from before: "I don't believe in [panspermia], I didn't believe in [panspermia], I never said I did believe in [panspermia], but I was trying to bend over backwards to give intelligent design its best shot."

I don't know how much more clear that point can be made.

If [panspermia] happened then Darwinism goes right out the window.

Please, check that I replaced "that" from your post with the proper word.  Assuming I did, the statement above is false.  Darwinism (by which I assume you mean "evolution") depends not on any particular genesis, only that a self-replicating organism exists, competes, passes traits to its "offspring" (nonformal usage), and there can be modifications (e.g. errors) in the replication.

No, I don't agree. Sloppiness is what he has become used to. That is the reason for the Stein debacle. Too long he has played to captive audiences. Because the audiences were already convinced and non critical the errors in his presentation went unnoticed.

You left it out, but I take it you still don't agree that what you say depends on who your audience is.  As for sloppiness, it is often easy to convey the correct idea through informal language.  With some things, it's the language you must use which can bog ideas down.  We do it all the time in mathematics, for example when I say that the eigenvectors of a matrix A are (1 2) and (1 0).  This is incorrect (there are infinitely many eigenvectors), but anyone who knows and understands eigenvectors gets exactly what I mean: that these two are a basis for the eigenspace of the matrix A.

More is not always better. There might be good moral and spiritual reasons for having more people. Sort of like the bigger the party the more fun. But genetically speaking at one time the whole earths population was about 50 - 60 million and we did fine. That is enough for a gene pool. As a matter of fact much less is required.

Is that really your argument?  That at one time we had a population that small and therefore genetic diversity above 50-60 million is not an advantage?  That is a non sequitur.

This again is not accurate. The documentary is the evidence. The Dawkinns rebuttal as I said,  is damage control. In the rebuttal they leave out much of Stein's and Dawkins exchange. They don't show the actual footage. They leave out the fan mail comment. This is a much better example of quote mining.

Not having the rights to video footage, therefore not violating national (at least, if not international) copyright law?  This is your idea of quote mining?!?  If you are going to claim that Dawkins quote mined, but then never show the example and ask me to fish through 2 hours of dreck to find it, then you are not supporting your arguments.  You made the claim, now I ask you again to show me a quote that Dawkins took from someone else, out of context, and misrepresented what they said.

Every time we quote, we end a statement prematurely. All qoutes are quote mining.

What a crazy idea.  Darwin's thesis is clear.  It is equally as clear that Stein took the quote and chopped it so that his words appeared to have the exact opposite of his thesis.  This is quote mining.  It is not quote mining if the thesis (the idea behind the quote) is preserved.

Those 2 paragraphs some people believe are just that. Paragraph 1, his true belief... Paragraph 2 a disclaimer, so they cannot quote paragraph 1 back at him. I do not hold to this but I am aware of how others reason. Important to know both sides and not just one sides viewpoint.

Without any supporting evidence whatsoever, such a claim may be dismissed.  If you do have any supporting evidence, then I will be very interested to hear it.

#33 Re: Euler Avenue » An interesting general article on math in science » 2010-06-20 03:45:19

You never answered my question: Is calling a charlatan a charlatan wrong?

No, it is just rude. Calling a man who is not a phony a phony is persecution.

Rude?  How so?  Also you go from being rude to being a persecutor by just making an error?  By just being wrong?

How in the world could Cantor be a charlatan?

Kronecker saw Cantor as making mathematics become about the unconstructible.  He believed that this would make mathematics entirely useless.

I can't fathom how you can relate James Arnold with Georg Cantor!

I can't fathom how you thought I was relating James Anderson to George Cantor.

So Prof dawkins, is not against Intelligent design, just certain types of designers, such as God - Ben

No answer from Dawkins! Watch your video again. . Stein, knew what his response would be. Richard was not ready to answer that question. How could he not be ready to deal with that question?  After having said he believed you might find the signature of an intelligent creator ( Aliens, what? ) inside of our biochemistry. That is directed panspermia! That is intelligent design. He believes in some form of Intelligent design, just not God.

Yes, Dawkins believes that it is possible that other intelligent life planted life on Earth.  How could this not be a possibility?  Dawkins however does not support this view, as he clearly states.  The evidence thus far for it is nil, which is why Dawkins does not support the view.  However, it is an idea which could one day, theoretically, become evidenced.

This has absolutely nothing to do with intelligent design.  Perhaps if you pretended you were in a vacuum, it might.  But we aren't in a vacuum.  Intelligent designers have given lectures saying "we don't know who the designer is" and then went back to their church where they said the designer is god.  Intelligent designers have made it their position that evolution is false and can't happen.  Because so many intelligent designers believe in such ideas, they have become associated with intelligent design.

He believes in some form of Intelligent design, just not God.

I don't know how you can say this.  Dawkins merely said it was possible, and then later said he does not support the view of panspermia.  Where is you evidence for the above statement?  So far, you've presented none.

Sorry Rick, that is dishonest. The truth is the truth. Of course he would have done better with an audience filled with his lackeys. Most of the time that is who he is speaking to. He cannot even stand up to one Ben Stein, let alone a hostile audience. He is supposed to be a scientist not a politician. You don't tailor the truth, you don't have to.

You're telling me that Dawkins should speak the say way to a room full of creationists that he does to a conference of biologists?  No, clearly not.  When speaking to one who is critical of your ideas, or simply doesn't understand them, you must be careful with your language.  You must try to use the most rigor you can, and put your ideas on solid logical ground.  When speaking to someone who you know understands you and is on board, one can be way more relaxed and sloppy.

Presentation of an idea can be very important.  Knowing your audience is step one in public speaking.  If you don't, you will most certainly fail.

He was not limiting his gene pool. 50-60 million people is a large enough number.

Ah, the good ol' "It's a big number" argument.  Bobby, more is always better.  It doesn't matter how big your number is.  No matter how big something is, if you make it smaller, you are by definition limiting it.

At the end of the trial when he lost, his refusal to pay the fine could have resulted in incarceration for possible contempt.

Yes, if the court tells you do something and you don't do it, there can be consequences.  This is persecution?

The Butler act was created by legislators who were pro creationism. The new law preventing intelligent design has been created by legislators who are pro Dawkins. Same deal, still persecution.

Having laws about what can and can't be taught in public schools is persecution?  Please, show me how.

The Dawkin's camp is doing a lot of quote mining themselves.

Such as?  Why do you continue to put forward assertions you know I will question without any evidence?

As for the quote concerning Darwin's comments about weak and sick people whom he calls imbeciles. The 2 paragraphs are not what they seem. I call that technique plus minus writing.

This isn't important at all, but your first sentence shows that you are misreading Dawin's quote.

We build asylums for the imbecile, the maimed and the sick.

He is separating out three people different types of people, the first being those who have a mental handicap (for which, "imbecile" is the proper word).  He is not calling the later two the first term.  But again, this isn't really important.  And I'm not sure what you mean by "The two paragraphs are not what they seem", since you don't seem like you want to explain that.  But I'm also not sure how that is relevant to the point being discussed: Ben Stein's honesty.  I'll try to state it plainly:

Ben Stein ended the quote prematurely, making it sound like Darwin thought humans shouldn't help one another.  A full reading of the quote shows that Darwin really thought the exact opposite: that our sacrifice for one another is noble.

Again, that's dishonest.

Check out number 4 in this link.  Yet another example of the dishonesty.

#34 Re: Euler Avenue » An interesting general article on math in science » 2010-06-15 10:57:45

Calling Cantor a corruptor of children and a charlatan is not scientific review, it is a personal attack. This is persecution, plain and simple.

Remember, we are not talking about math here. Compared to the life sciences, math is pristine. It's the life sciences who are being accused of persecution.

You never answered my question: Is calling a charlatan a charlatan wrong?  Is it a personal attack?  Is it persecution?  As for charlatans  in math, there are plenty.

As for "intelligent panspermia", hear from Richard Dawkins himself.  In the quotes before Dawkin's comment on them, it is clear that Ben Stein is purposely twisting Dawkins' words.  Dawkins merely said that it's possible.  Stein added in that Dawkins not only thinks it's possible, but added in "might be a legitimate pursuit", which he did not say.

That is dishonest.

When you pass laws stating that you someone cannot express his viewpoints that is persecution. He was an evolutionist, he believed in it. He could have been jailed. In that state it was and might still be against the law. That is exactly what the life sciences have done, passed laws forbidding the voicing of another opinion. It is amazing how similar Dawkinism and Creationism really are.

You're either making this up as you go along, or someone/something is misinforming you.  The Butler Act did not make it illegal to teach evolution, but rather teach evolution in public classrooms.  Huge difference.  He could teach evolution all he wanted, he could go out in the streets and try to preach it to people.  But the law said he couldn't do it in a public class room.

Further, the penalty under the law was $100 for the first offense, and $500 for each offense after.  He could not have been jailed.

Again, that is second hand knowledge and in no way affects the results, Everyone was asked pointed questions. Everyone answered them. If the Dawkins camp came out worse they should blame their ineptness. Admittedly Ben was able to outmaneuver Richard on several key points.

Dawkins was lied to about what the film would be about.  Dawkins saying that is not second hand knowledge.  So were other people who they interviewed.  If you don't know that you need to change what you say based on who your audience is, then you would be a horrible public speaker.  Dawkins thought he was speaking to one audience when he was really speaking to another because he had been lied to.  How the heck is that his fault?

Unfortunately Hiltler was a firm believer in Darwinism as he was also a false atheist.

If Hilter was a Darwinist, then he completely failed at understanding evolution.  Genetic similarity is a weakness for a species.  Hilter, by narrowing the gene pool, was doing the complete opposite of natural selection.  Maybe you could argue that Hilter believed he was following evolutionary principles, but the plain fact is that he wasn't.


Here is another example of Stein being dishonest. 
Here is Ben Stein saying that science leads to Nazism.

#35 Re: Help Me ! » help me on the set notation » 2010-06-15 10:16:00

Think about dividing the square [0,1] x [0,1] into n^2 little blocks.  Then you want to only include those little blocks which contain some piece of delta.  Which are those going to be?  Now do this as n goes to infinity by taking an intersection.

#36 Re: Help Me ! » help me on the set notation » 2010-06-14 11:55:47

i dont get this at  all.

Good.  Because you shouldn't.  delta is a subset of R^2, and I_n is a subset of R.  The statement "d = \cap I_n" doesn't make sense.

#37 Re: Euler Avenue » An interesting general article on math in science » 2010-06-13 15:21:45

Your quotes on Cantor were all about his ideas.  Is it wrong to call a charlatan a charlatan?  If your answer to this is no, then you are only upset at Kronecker because he turned out to be wrong.  Perhaps he was harsher than you thought he needed to be, but this is just a question of degree; i.e. shades of gray.

He is willing to accept that an alien species shot spores to earth and that is how life began here. "Since Darwinism and present day biology do not know how life began - R Dawkins" He also admits that he is willing to accept any intelligent design as long as it is not God! Please see the documentary, it is right there.

Yes, Dawkins thinks panspermia is a likely candidate for the origin of life on Earth.  But this does not make him believe in an "intelligent designer".  Surely you see the large gap.  By the way, your bias shows through here by putting, "intelligent" in front of panspermia.  Google only has 93 hits for such a term, and while it may make it seem like panspermia is close to intelligent design, in reality those concepts are in no way related (other than they both deal with origin of life).

Scope's Monkey trial.

The man was tried for the teaching of evolution, not believing it.  When you teach something you've been told you're not allowed to teach, you do deserve to be fired.

It is not correct to have passed judgement on something beforehand. To accept others opinions on topics is to deny your own intelligence. It is also unscientific. You may have difficulties acquiring the documentary, this is suspicious.

Accept others opinions?  Who the heck said I ever did that?  No, I read the facts.  The fact that they lied to the people who they interviewed.  The fact that I've seen Ben Stein talk about his movie, making the connection of evolution and Hitler when it's well known there isn't one.

You shouldn't make assumptions, bobby.

#38 Re: Euler Avenue » An interesting general article on math in science » 2010-06-13 07:44:02

I don't agree that criticism and destroying someone's career, Cantor's for instance are the same thing.

Certainly Kronecker was attempting to destroy his idea, or rather, his philosophy.  You have provided no evidence that Kronecker wanted to destroy Cantor, the person.  It was, for all we know, an unintended consequence.  Indeed if someone attacks your idea and you take it personally, that is your fault.  Horribly unfortunate, but until evidence is provided otherwise, as far as I can see Kronecker was doing his duty by testing the ideas of Cantor.

True this is rarer in math. Although it is now going on to opponents of a certain British mathematician of tremendous influence.

Why not just say who instead of waiting for me to ask?

The life sciences exhibit this persecution much more frequently. We only have to look at Linus Pauling, Otto Warburg, Alexander Fleming and many others to see that their work was criticized to the point of extinction.

What part of their work?  With Pauling and Warburg I take it you're referring to their involvement with cancer.  But what of Fleming?

This is somewhat incorrect, it is not well known. The Nasser book hints that JFN's problems were due to his work for Rand. The movie makes other claims. Since JFN was the technical adviser for both this is somewhat disturbing.

Regardless of the cause, his mental instability is the reason he was not recognized until as of late.  Doesn't matter though, every mathematician worth his salt has heard of him ever since he thesis on equilibrium.

Nothing to do with intelligent design, Richard Dawkins is a believer in intelligent design.

Evidence?

I would rather you see the documentary

Why?  What would this change?  I already know it's dishonest.  What is the point of listening to someone who you already know is going to lie to you?

In the old days when creationism held sway people were fired or jailed for disagreeing.

In the United States?  Name one.

Incidentally, employers almost never relate the correct reason for dismissal. If you are fired, reasons are written down which of course makes their position stronger ( covers their hineys so to speak ).

Yes, and those fired make up their own reasons as well.  To paraphrase, "I have no evidence, but it seems reasonable to me to believe evidence exists."

#39 Re: Euler Avenue » An interesting general article on math in science » 2010-06-12 02:28:14

Now was Carl just writing a novel. Or is he trying to say something?

Are you trying to say something?

As you know Poincare, Kronecker and others essentially drove Cantor mad and out of mathematics, Sometimes people are denied the fame they deserve in their lifetime due to scientific persecution.

Two mathematicians does not make a persecution.  Besides, Cantor is a wonderful example of the exact opposite of your point.  While Cantor's idea were harshly criticized, in the end they were the right ideas and they won out.  Today they are regarded by most mathematicians as one of the most beautiful discoveries.  All ideas need to be criticized, the ones that survive are worth knowing.

I also challenge the claim that he was denied fame.  He was a well known and quite popular mathematician in his lifetime.  Perhaps one could argue he would have been more famous, but that's not what you claimed above.

Did you know even as late as the night of the presentation of his Noble prize the committee was arguing about whether he should even get it. Why did it take them almost 40 years before his work was even known?

Is this rhetorical?  The answer is well known, and it has nothing to do with him going "against the party line".

The purpose of the persecution being described in Expelled is not the suppression of knowledge, that may not be possible. But to delay it by years, decades or even centuries.

The "persecution" in Expelled is about scientists being fired for not achieving the minimum level of scientific research at their institutions. You keep claiming there is persecution, but refuse to give an example of anyone being fired because they believe in intelligent design.

#40 Re: Euler Avenue » An interesting general article on math in science » 2010-06-11 16:25:53

Trying it for yourself. If you get a nice teaching position, veer off from the party line. See what happens. Most people believe that persecution doesn't exist in science but won't take the chance. So do they really believe it? Remember the passage in Contact, the book. Eleanor wouldn't put her face up to the pendulum ball, even though physics assures us each swing is slightly shorter.

Where is your evidence for the bolded assertion?  It is quite an impressive assertion.  Careers are made in science by proving that the other guy (or all other guys) are wrong.  When Nash told a colleague that he was attempting to prove a theorem relating algebraic varieties to differential geometry, he was told that he shouldn't press the matter, it would be a waste of time.  He did anyways, and came up with a beautiful and celebrated theorem.  Of course he also overturned everything that was known about economics and what is now referred to as game theory.  Today he is revered as one of the great mathematicians of the 20th century.

Pick any great mathematician or scientist you want to, and there is a good chance that what they did was against the grain, against convention, against the "party line".

Agreed, I feel that if the math doesn't back up their theory then something is wrong with their theory. I don't think questioning math is the answer. If they want to head back to a prehistoric era where they didn't use mathematics or computers, that's fine with me. As a matter of fact I have been expecting it.

This is not what I meant.  Of course the worst math is no math at all, but I don't believe it is even possible to have a system that can make predictions (i.e. science) without a set of rules at it's base.  And that is the definition of math: a (possibly arbitrary) set of rules which must be followed.  Not only is it a bad idea, I believe the idea itself is not possible.

#41 Re: Euler Avenue » An interesting general article on math in science » 2010-06-11 09:10:32

The doc goes into some detail.

The doc?

Only one way to prove it personally...

Which is?

Have you ever had the unfortunate experience of working ( doing math ) for one of these life sciences guys?

I did some computational biology research for a summer, but it was working for a physicist/computer scientist.  Anyhow, I'm still not entirely sure what is making you upset at the article.  At first it seemed like people being forced out of science for going against the accepted theories, and now it seems to be because they think math may not be as useful as it once seemed.

They also seem to have a complete misunderstanding what math is.  To boil it down, it's any system of rules.  I find it impossible to imagine a science (or a universe!) that didn't rely on rules.

#42 Re: Euler Avenue » An interesting general article on math in science » 2010-06-11 04:20:53

Persecuting dissenters is akin to Nazism. It is not unique to Nazism.

Yes, but criticizing ideas is a necessary part to a free market of ideas.  Otherwise, there is no "survival of the fittest (idea)".

You haven't seen Expelled, then.  I don't know how many have lost their jobs. According to the reports disagreement with biological dogma is grounds for termination and more.

I have read many reviews, but never seen the movie.  Thus far, every scientists that I've seen claimed to be "expelled" for believing in intelligent design has been expelled for other reasons, such as not publishing novel work (which is a job requirement), or not teaching the proper curriculum.  I would like to see an example of a single scientist who was fired for not believing in evolution.

#43 Re: Euler Avenue » An interesting general article on math in science » 2010-06-09 08:40:22

That's not science, that's Nazism.

What is "that"?

So ticked off that they are bouncing dissenters off their jobs? There is a word for that and it isn't science. That's why the math and biology don't jive. One is wrong, think you know which I'm betting on.

Who has lost a job?

At all? Didn't this statement bother you at all? What, math doesn't work because they won't or can't use it correctly? Because it might be exposing the fallacy of their dogma?

Anyone not using mathematics for technological developments will be left behind.  The problem will take care of itself.

#44 Re: Euler Avenue » An interesting general article on math in science » 2010-06-08 14:14:29

You only have to watch Expelled to see that they are trying to force a public relations paradigm ( similar to the Lysenko affair ) on science.

Only a minority of scientists are taking this point of view, most others are pissed off at them.

#45 Re: Help Me ! » Holomorphic self-map on D(0,1) » 2010-05-31 12:05:59

You want to use Schwarz's lemma.

#47 Re: Help Me ! » separation axiom » 2010-05-25 14:36:18

For T_0, you want to find an open set that contains a but does not contain b, where a is not equal to b.  Are you having problems with this?

For T_1, remember that the sets you wish to separate two points with need not be open.  In fact, because the cocountable topology is not Hausdorff, it is actually required that they are not open.  With T_1, all that is required is that their closures not intersect.  With this is mind, your life is made much easier if you choose closed sets.

#48 Re: Help Me ! » separation axiom » 2010-05-25 14:27:59

What is (ℝ,τ_{√2}) ?

#49 Re: Help Me ! » complex power series » 2010-05-19 08:24:30

Consider the function on the disk.  That R^2 is uncountable means that for some n, there is a limit point in the set {p : a_n = 0 in the power series about p}.  The nth derivative of f is therefore zero an each of these points.  Since there is an infinite amount of points in a compact set, there is a limit point.  This implies that the nth derivative of f is zero on the entire disk.  Therefore the nth derivative of f is zero everywhere giving that f is a polynomial.

#50 Re: Help Me ! » Complexifying a problem » 2010-05-16 14:09:14

Identity wrote:

Thanks ZHero, I'm not sure what to do with the absolute value signs though. It acts as the modulus doesn't it? And everytime I evaluate the modulus of the stuff it comes out to be 1 hmm

There are no "absolute values" in complex analysis, only modulus.

The modulus of z is 1, as you said.  This has to happen, otherwise you'll get a nonreal result.  Now just calculate the arg(z) by finding the real and imaginary parts, z = a + bi, and then arg(z) = arctan(b/a).

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