# Olivier Bégassat

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olivier dot begassat dot cours at gmail dot com

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 12h comment Property about splitting Conjugacy class of $S_n$ Related question : math.stackexchange.com/questions/144686/… 12h comment Property about splitting Conjugacy class of $S_n$ For the first point, it is because $A_n$ has index 2 in $S_n$. 1d comment $M \rightarrow M^T M$ is a continuous mapping. Your idea about the entries being (quadratic) expressions in the entries of $M$ works perfectly well. Mar6 comment compact open topology on M(X,Y) continuous function space First, $M(X,Y)=Y^X$ as sets (why?). Then write down the subbasic open sets for both topologies (what are the compact subsets of $X$?), see that they are the same, thus define the same topology. Mar4 answered Non-isomorphic Group Structures on a Topological Group Mar4 comment Non-isomorphic Group Structures on a Topological Group @B.Fischer I made the same comment a few minutes ago, but deleted it. I think the OP already takes care of that as he considers group structures up to isomorphism. Mar4 revised Euler's totient function of 18 - phi(18) Added an s to the command \cdot Mar4 revised Non-isomorphic Group Structures on a Topological Group Added a space. Mar4 reviewed Approve suggested edit on Figuring out y in a denomination polynomial Mar3 comment What does permutation stand for as a power? Probably conjugation : given two permutations $x,y$, one sometimes writes $x^y$ for $y^{-1}xy$. Mar2 reviewed Close Choosing $5$ cards from a deck of $52$ cards Mar2 reviewed Close Nilpotent Subring Mar2 reviewed Close Proving density of $\mathbb{Q}^n$ in $\mathbb{R}^n$ Mar1 comment Is this Chinese card game solved? You can modify your question. Mar1 comment Is this Chinese card game solved? How would you get 24 from four aces? Or four kings or four jacks? Feb26 reviewed Close How many ways can 5 of 9 factories be visited? Feb26 reviewed Leave Open Equality in Minkowski's inequality proof(no integrals) Feb26 reviewed Leave Open Proving inverse of transpose is transpose of inverse Feb25 reviewed Approve suggested edit on How to prove a simple proposition about local rings and maximal ideals Feb21 reviewed Leave Open Find the volume bounded by a cylinder.