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Hobbie

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Top Questions

What should be in every grad student's library?

big-list reference-request asked Feb 10 '11 at 10:01

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Why are generating functions useful?

combinatorics generating-functions asked Mar 7 '11 at 3:32

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How does one get the formula for this bijection from $\mathbb{N}\times\mathbb{N}$ onto $\mathbb{N}$?

elementary-set-theory asked Mar 28 '11 at 3:58

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In generatingfunctionology, for a polynomial $P$ and a differential operator $D$, what does $P(xD)$ mean?

notation generating-functions asked Mar 10 '11 at 7:04

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How many strings of length $n$ with $m$ $1$s have no more than $k$ consecutive $1$s? - from generatingfunctionology

combinatorics generating-functions asked Mar 11 '11 at 5:41

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Does $a^2+b^2=1$ have infinitely many solutions for $a,b\in\mathbb{Q}$?

geometry arithmetic diophantine-equations asked Apr 4 '11 at 5:13

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Is there a slick way to show that finite projective planes of $7$ points are unique up to isomorphism?

graph-theory projective-geometry asked Feb 8 '11 at 1:06

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Do there exist sets $A\subseteq X$ and $B\subseteq Y$ such that $f(A)=B$ and $g(Y-B)=X-A$?

homework elementary-set-theory fixed-point-theorems asked Feb 17 '11 at 23:15

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Determining precisely where $\sum_{n=1}^\infty\frac{z^n}{n}$ converges?

sequences-and-series complex-analysis convergence asked Mar 10 '12 at 22:15

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Does there exist a general graph for any degree sequence of even natural numbers?

graph-theory asked Apr 11 '11 at 20:22

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