Math Is Fun Forum
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#476 Re: Maths Is Fun - Suggestions and Comments » Bug when logging in » 2014-05-20 23:43:45
I don't mind too much about this particular one - I can get used to it. The LaTeX display error in the dark formats is bad though, since I usually use those layouts.
#477 Re: This is Cool » I need a help » 2014-05-20 23:42:45
You have to state the question better, maybe like nontrivial solutions only.
alpha = 0, n = 0
#478 Re: Exercises » What do you think? » 2014-05-20 23:40:47
I also think it should cost more than 2 rep points. If an up vote is 5 or more, so should a down vote.
I thought they didn't cause any reputation points? Mine stay the same?
#479 Re: Maths Is Fun - Suggestions and Comments » Bug when logging in » 2014-05-20 23:38:46
Hi;
I meant that post for mathaholic, but anyway, I still wrote there that it still happens.
This still happens after the upgrade.
#480 Re: Help Me ! » Functions » 2014-05-20 23:32:59
#482 Re: Jai Ganesh's Puzzles » 10 second questions » 2014-05-20 13:53:03
#483 Re: Exercises » What do you think? » 2014-05-20 13:06:44
You're welcome.
Who's giving bobbym so much reputation?
#485 Re: Help Me ! » why do i have to login twice » 2014-05-20 13:02:14
I like the upgrade as it feels subtly better.
It doesn't matter too much which forum software is used - the content matters much more.
#486 Re: Help Me ! » Functions » 2014-05-20 13:00:54
As an added note, you are assuming that all functions are surjective. That is not the case.
#487 Re: Help Me ! » Functions » 2014-05-20 12:56:30
What about it?
#488 Re: Maths Is Fun - Suggestions and Comments » Polls and no posts count » 2014-05-20 12:14:47
We need better rules.
#489 Re: Help Me ! » general 4x4 determinant » 2014-05-20 11:36:12
Hi John E. Franklin;
Did you finish the lectures?
#490 Re: Help Me ! » help me! Q=D={x|x is an integer such that x^2=2) » 2014-05-20 11:26:43
Of course, the total amount of usually considered axioms are in the hundreds.
#491 Re: Help Me ! » kinetic energy » 2014-05-20 09:19:39
I don't have the links but what I wrote in my last post it really all the advice you will get from the other forums.
Are we done with the problem or is there something else you don't understand?
#492 Re: Exercises » What do you think? » 2014-05-20 08:42:04
Yes.
#493 Re: Help Me ! » help me! Q=D={x|x is an integer such that x^2=2) » 2014-05-20 08:37:11
I was talking about the field axioms.
(1) Addition is commutative.
(2) Addition is associative.
(3) There exists an additive identity 0.
(4) Existence of additive inverses (opposites).
(5) Multiplication is commutative.
(6) Multiplication is associative.
(7) There exists a multiplicative identity 1.
(8) Existence of multiplicative inverses (except for 0).
(9) Distributivity of multiplication over addition.
Speaking of cosmology, I am planning to have a career in quantum cosmology.
#494 Re: Help Me ! » kinetic energy » 2014-05-20 08:32:03
I deleted the older post to put all of the part solutions.
This is about the 10th time I am doing this question from other forums. Let me guess: you go to Teeside university.
a)
Work=force ×distance
W=80 ×5
W=400J
b) Use sigma F = ma. From this find the sum of forces. There are two forces acting: the 80N push and the resisting force of friction. So force of friction = pushing force - ma.
c) Calculate the mass's acceleration from the data that it moves 5 m in 0.92 seconds: from d = 1/2 at^2 and solve for a. Then calculate velocity as a function of time: v = at. Finally Kinetic Energy as a function of time is KE= 1/2mv^2 = 1/2m(at)^2
d) Kinetic Energy as a function of distance is v^2 = 2ad so Kinetic Energy = 1/2mv^2 = 1/2m(2ad)
#495 Re: Exercises » What do you think? » 2014-05-20 08:07:57
I don't care about how long to live!
I do.
#496 Re: Help Me ! » Functions » 2014-05-20 07:59:54
What does it being surjective have anything to do with it being a function? Anyway, to tell if it is a surjective function, we need it's codomain.
It is not a function.
A function is a relation that relates every element of the domain to exactly one element of the co-domain.
No, you mean range or image.
#497 Re: Help Me ! » why do i have to login twice » 2014-05-20 07:36:15
This still happens after the upgrade.
#498 Re: Help Me ! » help me! Q=D={x|x is an integer such that x^2=2) » 2014-05-20 07:28:02
Often the case, but not essential. But just to satisfy you; here are some worthy questions:
(1) What is bobbym's real age ?
(2) What is your favourite colour ?
(3) Where on Earth is the place that is furthest from the centre of the Earth ?
(4) Is this question worthy ?
Can you give an example of a question that is not worthy ? And even if you can, you would be wrong (sorry
) because your example breaks the first axiom of the theory.
Bob
1. 12
2. I do not know.
3. Of course not. I know enough physics (this pops up in geophysics) to know that it is Chimborazo in Ecuador.
Axioms outside of mathematics do not exist. 
#499 Re: Guestbook » I guess that's falling in love » 2014-05-20 01:57:44
So? Do headphones matter?
I did not listen to the song, just saw the lyrics.
#500 Re: Guestbook » I guess that's falling in love » 2014-05-20 01:10:56
I hate the songs nowadays... Nonsense lyrics and music.