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#1102 Re: Exercises » Bafflers? » 2014-03-07 23:14:06

Yeah, so it's basically

#1103 Re: Help Me ! » Evaluation of a product of two gamma functions » 2014-03-07 23:05:29

There is an identity on Wiki that says that Gamma(z)*Gamma(1-z)=pi/sin(pi*z).

#1105 Re: Exercises » Group Theory » 2014-03-07 22:51:04

JaneFairfax wrote:
Ricky wrote:

(It may be noted that matrices of integers are groups).

Are you sure? Or have I misunderstood something here? yikes

I don't think they are a group under multiplication, because not all the matrices in the set have inverses...

#1107 Re: Science HQ » Example of equilibriums » 2014-03-05 22:36:14

Hi Agnishom

I like the example of a ball on a curved surface.

When the surface is straight, the equilibrium is neutral, because you can move the ball around and it will stay in the place you move it.

When the surface is curved down, the equilibrium is unstable on the highest point of the surface, because if you push the ball just a little bit, it will fall down.

When the surface is curved up, the ball will fall back to the lowest point when you push it, so it's a stable equilibrium.

#1108 Re: Computer Math » Optimising Ackermann Recursions » 2014-03-04 16:13:50

Then I'd either find a very fast and powerful computer or do a lot of number theory.

#1109 Re: Help Me ! » arithmetic progression. » 2014-03-04 16:11:39

m and n aren't equal. The fact that they are not allows us to divide by (m-n)...

#1111 Re: Science HQ » 2-ethyl-3-methyl-hexane » 2014-02-25 02:28:56

What's in a name? That which we call a rose by any other name would smell as sweet.

#1113 Re: Science HQ » 2-ethyl-3-methyl-hexane » 2014-02-24 11:41:03

Yes, that goes without saying. smile

Just, out of pure respect, should we be saying the Oracle?

#1114 Re: Science HQ » 2-ethyl-3-methyl-hexane » 2014-02-24 08:58:48

A high-schooler with 3 years of chemistry can sure confirm that! smile

#1115 Re: Computer Math » Fourier series » 2014-02-22 22:44:24

I get the "fungi" all the time when working numerical stuff in M. The fungi part most often appears next to the imaginary number, so the answer appears to be complex, when it is, in fact, real.

#1116 Re: Computer Math » Integrating a piecewise function with Maxima » 2014-02-22 22:29:15

bobbym wrote:

Hmmm, how can you follow what I am posting if we speak different languages?

We already found that that can be quite a problem.

#1117 Re: Dark Discussions at Cafe Infinity » icelandic dictionary » 2014-02-22 09:25:27

I like Nordic languages in general. They just sound very cool!

#1120 Re: Help Me ! » lim » 2014-02-22 00:53:45

Actually, I twisted the signs a little. It's not 2/3. M gets QPochhammer[1/2, 1/2]...

#1121 Re: Help Me ! » lim » 2014-02-22 00:07:09

Hi

The answer is 2/3.

#1122 Re: Help Me ! » 9999999 = 1 » 2014-02-20 17:50:53

You NEVER divide by infinity. More precisely, you NEVER use infinity as a number. What you do in physics class is look at the limit of the expression as one of the distances tends to infinity. You just use it intuitively without notation.

#1124 Re: Help Me ! » Convergence test of series » 2014-02-20 02:47:30

Hi ffd

Yes, I've seen it. I'm trying to find 1/k^(1/k) when k tends to infinity.

#1125 Re: Help Me ! » Number of Weight stones » 2014-02-20 02:43:24

I didn't say anything about 80. I said it about 81.

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