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#226 Re: Dark Discussions at Cafe Infinity » ACK! The worm might be getting released tomorrow! EXLUSIVE! » 2009-04-13 15:01:51

Identity

I don't think that test can tell for sure. I heard the worm infiltrated CBS or CNN or something and it took them 5 days 24 hours a day to find and eliminate it, and they think even now the worm may still be hiding on the system somewhere.

#227 This is Cool » The square roots of recurring '1's » 2009-04-13 03:13:16

Identity
Replies: 2

Try taking square roots of numbers of the form 111...1111 with different numbers of  '1's. Notice anything interesting?

What happens when the number of '1's tends to infinity?

Can you predict what the square root of 111...111 (1000000 '1's) will be with great accuracy?

Can anyone explain why this is?

I thought it was interesting smile

#228 Re: Help Me ! » Find Area » 2009-04-12 05:44:57

Identity

Thanks Jane, I was having trouble finding the vertices for the first graph. big_smile

However, I used the cross product to find the areas and they are still equal.

#229 Help Me ! » Find Area » 2009-04-12 05:00:02

Identity
Replies: 2

Find the area described by

and

Is this the SAME area as

and
?


Thanks~!

#230 Re: Help Me ! » u-substitution question » 2009-04-12 03:16:08

Identity

Thanks both of you smile

#231 Help Me ! » u-substitution question » 2009-04-11 14:55:45

Identity
Replies: 5

When solving

,

If I let

, then the limits of integration become
and
. Why? dunno

#232 Re: Help Me ! » hard complex numbers » 2009-04-04 17:03:33

Identity

Thanks mathsy smile

#233 Re: Help Me ! » Argand graph » 2009-04-04 16:52:27

Identity

Thanks daniel!! big_smile

#234 Re: Help Me ! » hard complex numbers » 2009-04-04 07:24:23

Identity

Wait, so is this right for

?

and

If

, and

So

But here

isn't any single value, rather it is within a range of values, how can you change this to x and y?

#235 Help Me ! » hard complex numbers » 2009-04-04 04:36:19

Identity
Replies: 4

Let

. Let
. Hint: Use

a) Find the relation between x and y such that:
i)


ii)

b) In each case describe carefully the locus of z.


I don't know how to start, help please!

#236 Help Me ! » Argand graph » 2009-04-04 03:57:57

Identity
Replies: 2

What does the graph of

look like?

Also, is it equivalent to

, or do you have to make everything positive, like with Real graphs?

Thanks smile

#237 Re: Exercises » Play with numbers » 2009-04-03 19:22:07

Identity
smiyc86 wrote:

OR here in no way meant that it can be div by both ... u cannot implicitly arrive to a conclusion of ur own ....

The standard definition of 'OR' is inclusive. Standards are created so misunderstanding cannot occur, so if you don't agree with a standard then it is your responsibility to explain your own definition in the problem statement, otherwise everybody will assume the standard definition.

But anyway, this is a trivial matter, nothing to get too fussed or upset about, I thought Jane was quite mannered in her post.

#238 Help Me ! » Find maximum w » 2009-04-03 05:38:16

Identity
Replies: 1

Please help me with this question,

Let

Find

such that
is a maximum in S.

Thanks smile

#239 Re: Dark Discussions at Cafe Infinity » ACK! The worm might be getting released tomorrow! EXLUSIVE! » 2009-04-02 23:06:36

Identity

Thanks MathsIsFun, I'm not infected smile

By the way, how is this worm spread? Is it by email or website? I don't have good computer security at the moment so what do I have to watch out for?

#240 Help Me ! » just a locus concern » 2009-03-30 19:33:19

Identity
Replies: 1

If the real part of

is zero, describe the locus.

Here's what I eventually came to:

The answers get

Thanks

#241 Re: Formulas » Complex Number Formulas » 2009-03-30 19:10:10

Identity

Properties of the magnitude:

  (Triangle Inequality)

#242 Re: This is Cool » Abel prize awarded to Mikhail Leonidovich Gromov » 2009-03-28 15:15:05

Identity

I thought the Fields Medal was the Nobel Prize of Maths

#243 Re: Help Me ! » Please help » 2009-03-23 23:15:12

Identity

Thanks Jane smile

#244 Re: Help Me ! » Please help » 2009-03-23 00:09:17

Identity

Ah, so the second case introduces extraneous solutions?

#245 Help Me ! » Please help » 2009-03-22 23:39:09

Identity
Replies: 4

You could....

Or you could....


Is this correct? It seems quite bizarre to me !

#246 Re: Dark Discussions at Cafe Infinity » Eleven die in Alabama shootings » 2009-03-14 12:14:32

Identity
integer wrote:

It is not the people of Alabama, the United States, Britian, France, Iran, Iraq, or any other place.  It is persons who cannot control or direct anger in a more meaningful manner.

Sometimes death by violence is the only choice.
Most often, there are many other ways to reach a solution to a problem.

Re-arranging you prejudices doesn't make you a more rational person, but sometimes it allows insight into your specific bias.  (And for that, I apologize to the original author - William James)

Maybe we should be questioning the freedom to own firearms...

#247 Re: Help Me ! » List of quadrilateral vector proofs » 2009-03-09 22:33:31

Identity

Thanks a heap Jane! big_smile

I'll have to change my list

#248 Re: Exercises » Prove composite » 2009-03-08 18:59:00

Identity

But I don't think that is the solution you were looking for

#249 Re: Help Me ! » Asymptotes » 2009-03-07 22:25:10

Identity

Thanks luca-deltodesco! big_smile


I'm just wondering, which method do you prefer? My teachers like the transformation method but I find it very annoying!

#250 Re: Help Me ! » trig simplification » 2009-03-07 22:24:10

Identity

thanks kurre! I thik I made a mistake factoring

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