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Aug
19
accepted Lights out game on hexagonal grid
Aug
19
accepted Proof and software
Aug
19
accepted Enumerating necklaces
Aug
19
accepted Stochastic/finance monte carlo question
Aug
11
awarded  Favorite Question
Aug
11
comment Logic behind dividing negative numbers
I most definitely disagree with the first two sentences. Mathematics is not a game of symbols. It should have a concrete foundation and it is good that the original questioner is trying to give meaning to the abstract notion of division.
Jul
16
awarded  Notable Question
Jul
2
awarded  Curious
Jun
9
accepted Area of projected surface
Jun
9
comment Area of projected surface
The area is still correct.
Jun
9
comment Area of projected surface
I'm looking at the part you just added and I am not seeing the parallelogram. Instead I see a curve $z=x^2$ on the bottom of the "parallelogram" for example, and $z=x^2+4$ for the top.
Jun
8
asked Area of projected surface
Apr
9
comment Which number is larger and Why? 1.7 or 1.73205
How did the approximation for $\sqrt{3}\simeq 1.73205$ enter the picture?
Feb
6
awarded  Popular Question
Oct
26
awarded  Yearling
May
16
comment Are these 2 graphs isomorphic?
How did you make this movie?
May
8
awarded  Caucus
Apr
30
awarded  Nice Question
Mar
7
answered How can I conclude that an automorphism is the identity map?
Mar
7
comment How can I conclude that an automorphism is the identity map?
@azimut: Zero is still going to zero. The group automorphism I give is clearly not the identity map but it does fix a non-zero element. So Zach's result is false for cyclic groups.