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  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

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#1264 Re: Guestbook » How old are you bobbym? » 2015-09-18 12:45:37

Emily316 wrote:

There are lots of different red beans. Kidney beans, Honduran beans, Azuki beans. red rice beans. All sorts. My favorite are kidney beans.

Cannellini (white kidney) beans are great, and underrated in favour of their red counterpart. The red variety are cheaper in general, however.

#1266 Re: Help Me ! » Why isn't the Feynman Integration Trick Working? » 2015-09-18 07:55:33

It's OK -- I'll try to post a video or two summarising all of those concepts as best as I can. None of them are actually difficult to understand: in fact, using them, in this context, just comes down to algebra.

#1269 Re: Help Me ! » Logarithms. What's the deal?!?!?!? » 2015-09-18 03:47:44

CIV wrote:

what power do I have to raise 8 to get 16 or whats the root of 16 to get 8? That's it. You kind of just have to play around to get the answer.

. No trial and error involved.

#1273 Re: Help Me ! » Why isn't the Feynman Integration Trick Working? » 2015-09-18 00:55:59

Sure. The main things you need to know to do definite integrals using methods of contour integration are:

-Which contour to use, and how to parametrise it;
-Defining your function (this is especially important for logarithms);
-Finding the poles of a function;
-Calculating residues at poles and using the residue theorem;
-Using the estimation lemma to bound curves that you want to tend to zero.

I'll try to create some videos about each of these things, summarising some of the concepts with some examples.

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