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2h
awarded  Nice Answer
12h
comment Proof bu induction?
Try asking again at math.SE. When you ask it there, make sure you've shown what you've tried.
15h
comment Time zone Projection
Still lacking. Where precisely is your timezone map and plain map? Are they in an equirectangular projection, Mercator, or something else? In any case, look up ImageCompose[].
19h
comment Expanding PolyGamma function error
@mmal, I think that the kernel couldn't handle that much recursion at that point. You may have to resort to evaluating explicit Sum[]s instead.
20h
comment $\mathbf L\mathbf D\mathbf L^\top$ Cholesky decomposition
Hi @Shutao, thank you, but let's keep that talk in the designated chatroom only. :)
20h
revised Expanding PolyGamma function error
edited tags
20h
comment Expanding PolyGamma function error
Unfortunately, I am not at a computer to test things out more fully and thus write a substantial answer; I merely guessed based on what you've shown me. What is clear is that the internal recursive implementation was not written to account for large integer arguments. I will add the bugs tag now, but let's also wait for other people to test this out.
20h
revised Legendre expansion of functions
edited tags; edited title
20h
comment Expanding PolyGamma function error
A clear bug, I think; somebody botched the recursive relation behind the scenes. Can you try Block[{$RecursionLimit = Infinity}, FunctionExpand[PolyGamma[1051/2]]]?
21h
comment Expanding PolyGamma function error
Very interesting. For reference, do you get similar errors for Gamma[] and HarmonicNumber[]?
21h
comment Calculate sum of probabilities in multinomial model
Did you know that Multinomial[] is built-in?
21h
revised Minimal overlap area of circles
edited tags
21h
comment Minimal overlap area of circles
…and you want to do this with Mathematica the software?
1d
comment Time zone Projection
How did you generate "a sphere with an accurate time zone projection"?
1d
revised Problem with mathematica plot 3d
added 183 characters in body
1d
comment Advice for Mathematica as Mathematician's Aid
The "Evaluate in place" feature is also sometimes handy when doing algebraic gymnastics. You can highlight certain sections of your long expression, press Ctrl+Shift+Enter, and whatever you've highlighted is replaced by its evaluated version.
1d
revised EquationTrekker using Mathematica 10.2
edited tags
1d
comment EquationTrekker using Mathematica 10.2
"…GUIKit which is being deprecated as far as I know…" - very sad. OTOH, this does look like something that can now be done by Manipulate[]; I hope someone there would consider rewriting this package.
1d
comment $\mathbf L\mathbf D\mathbf L^\top$ Cholesky decomposition
Dear @Shutao, I will only be able to study it over the weekend, if you don't mind waiting. P.S. I am a chemist, not a mathematician. :)
1d
comment Problem with mathematica plot 3d
The exponential constant is a capital E: E^(-(x - t)^2)