bio | website | quora.com/Alon-Amit |
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location | Los Altos, CA | |
age | 45 | |
visits | member for | 5 years, 1 month |
seen | 2 days ago | |
stats | profile views | 3,735 |
Dabbler in things.
Mar 19 |
revised |
What are the worst notations, in your opinion ?
added 24 characters in body |
Mar 19 |
comment |
What are the worst notations, in your opinion ?
@Qiaochu: I'm really only talking about the interior case. It's then that the \osum is the same subspace as the sum but with the implied additional condition on the subspaces. |
Mar 19 |
comment |
how slow can the dimension of a product set grow?
So the circle S^1 has dimension 2 in your sense? If so, I don't know if this has a name but I certainly wouldn't recommend "dimension". |
Mar 19 |
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What are the worst notations, in your opinion ?
@Francois: Sheesh, of course. Sorry. Fixed. |
Mar 19 |
revised |
What are the worst notations, in your opinion ?
deleted 4 characters in body; added 11 characters in body |
Mar 18 |
answered | What are the worst notations, in your opinion ? |
Mar 17 |
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Fundamental groups of noncompact surfaces
If I had been faster I would have proposed the same reference so you wouldn't have had to advertise your own book. I'm a fan :-) |
Mar 16 |
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Properties of Graphs with an eigenvalue of -1 (adjacency matrix)?
If G->B is a covering map (in the topological sense), then G inherits all the eigenvalues of B (just choose an eigenfunction that is uniform on the fibers). So, for instance, any graph which covers K_n for any n has -1 as an eigenvalue. The cycle of length 3k covers the triangle, which is another way to explain Kevin's example. |
Mar 16 |
awarded | Nice Answer |
Mar 16 |
awarded | Popular Question |
Mar 14 |
awarded | Enlightened |
Mar 14 |
awarded | Nice Answer |
Mar 12 |
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Books you would like to see translated into English.
That's +10 from me, too. |
Mar 10 |
answered | A historical question: Hurwitz, Luroth, Clebsch, and the connectedness of M_g |
Mar 9 |
revised |
Why are the sporadic simple groups HUGE?
added 2 characters in body |
Mar 9 |
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If $2^x $and $3^x$ are integers, must $x$ be as well?
This answer was given by Gerry. I just added the link to Wikipedia. |
Mar 9 |
revised |
If $2^x $and $3^x$ are integers, must $x$ be as well?
Added wikipedia link |
Mar 9 |
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If $2^x $and $3^x$ are integers, must $x$ be as well?
Very interesting! Just to make sure I understand - does this generalize the "n^x for all n" version only, or can it be applied to "2,3,5" and "2,3" as well? |
Mar 9 |
accepted | If $2^x $and $3^x$ are integers, must $x$ be as well? |
Mar 9 |
comment |
If $2^x $and $3^x$ are integers, must $x$ be as well?
@jef: the best hint I can think of is "calculus of differences". |