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bio website math.stanford.edu/~rmbellov
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Dec
24
comment Shape of snowflakes
I don't like your random model: it seems much more reasonable to fix a probability p and at time t, attach a new hexagon at every available lattice point with probability p. Assuming a fair amount of water in the air, water crystallizing at one vertex should be independent of water crystallizing at other vertices (to a first approximation).
Oct
8
awarded  Yearling
Mar
18
awarded  Good Answer
Mar
18
awarded  Nice Answer
Mar
18
awarded  Nice Question
Nov
2
awarded  Nice Answer
Oct
8
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May
11
awarded  Popular Question
May
8
awarded  Commentator
May
8
comment What's the difference between a real manifold and a smooth variety?
Don't these all illustrate the differences between real and complex manifolds, rather than between real manifolds and smooth complex varieties?
Apr
25
awarded  Organizer
Apr
25
revised triangulations of torus, general, and Euler number. (Hopefully more interesting/relevant)
edited tags
Mar
21
comment Chinese Remainder Theorem for rings: why not for modules?
Tensor the map $R/(I_1...I_n)\rightarrow R/I_1\times...\times R_I_n$ over $R$ with $A$.
Feb
23
awarded  Fanatic
Feb
15
comment visualizing what's going on in based homotopy theory, et al.
For c), have you looked at chapter 4 of Hatcher's book? Everything there is very geometric.
Feb
14
answered Homeomorphism onto a closed subset of a scheme that isn't a closed immersion
Jan
24
awarded  Nice Answer
Jan
24
answered Why does the group law commute with morphisms of elliptic curves?
Dec
6
awarded  Enthusiast
Dec
4
comment Why is Riemann-Roch an Index Problem?
A lot is brushed under the rug, like carrying out all of these steps on more than a formal level. Also, things like metrics on line bundles are hidden in the definition of the adjoint and the defintion of c_1.