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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.
Mar
7
comment How can I conclude that an automorphism is the identity map?
What about the cyclic group $Z/8Z$? There is the automorphism taking $x$ to $-x$, but 4 remains fixed.
Feb
11
awarded  Notable Question
Oct
26
awarded  Yearling
Sep
16
awarded  Notable Question
Aug
20
comment A little help with algebra (homework)
Wouldn't just multiplying it out answer the question?
Apr
25
awarded  Popular Question