Igor Rivin
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53,653
99/100 score
 3h revised What is the probability that two random permutations have the same order? fixed typo 8h answered What is the probability that two random permutations have the same order? 21h awarded Nice Answer 1d comment Most discriminants are almost squarefree Why is it true that "The proportion of polynomials in $\mathbb{Z}_p[x]\dots$ is $O(p^{-2}?$" 1d comment Ramanujan graphs and stable real polynomials Which paper? Please give a reference. 2d awarded Popular Question Feb 2 comment Hyperbolic 3-manifold groups acting on the plane @EricS. See my answer. This is all that is known. Feb 2 answered Hyperbolic 3-manifold groups acting on the plane Jan 30 comment Lattice points near a curve @FanZheng There are more symbols than words there :) And yes, the paper is about smooth curves. Jan 30 awarded convex-polytopes Jan 29 answered Lattice points near a curve Jan 28 answered Proofs of Fermat-Wiles theorem for exponent 3 Jan 28 comment Spectrum of Laplacian matrix of an infinite tree graph @NateEldredge If you read the OP's question, that is NOT what he is asking (although it is true that there is continuous spectrum in the interval - I think this is not so difficult to check by looking at eigenfunctions decaying exponentially radially from the root). And if by "deduce", you mean "subtract from $4$" yes, correct. Jan 28 comment Derivative of eigenvectors of a matrix with respect to its components This is definitely in Kato's book. Jan 28 answered Spectrum of Laplacian matrix of an infinite tree graph Jan 26 comment Fast Symbolic Linear Algebra CAS? If you described your problem, perhaps something useful could be said, otherwise, your question is too general. Jan 26 answered Closed formula for the generating function of the sequence of powers Jan 25 answered Is there a limit definition for the roots of a polynomial with arbitrary degree? Jan 23 answered Question related to Fermat curve: Does the equation $A x^n + By^n = C z^n$ have any solution in $\mathbb{N}$? Jan 23 answered Sample integer points of cross-polytope uniformly