# Olivier Bégassat

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olivier dot begassat dot cours at gmail dot com

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 Mar20 comment Conjectured closed form of $G^{2~2}_{3~3}\left(1\middle|\begin{array}c1,1;b+1\\b,b;0\end{array}\right)$ @Lucian does this Ramanujan fellow have an account on MSE? Mar20 comment Is there any point-set definition of simple connectedness? @nik I understand your point, but it's the best I could think of, and in the very least it shows that simple connectedness can be reduced to connectedness of $X$ and an auxiliary space. Mar20 answered Is there any point-set definition of simple connectedness? Mar19 answered Prove that if $n$ is composite, then $(n-1)! \equiv 0 \pmod n$ Mar19 comment Prove that if $n$ is composite, then $(n-1)! \equiv 0 \pmod n$ What have you tried? Mar17 awarded Revival Mar12 reviewed Close The property of positive fourier series. Mar11 comment Property about splitting Conjugacy class of $S_n$ Related question : math.stackexchange.com/questions/144686/… Mar11 comment Property about splitting Conjugacy class of $S_n$ For the first point, it is because $A_n$ has index 2 in $S_n$. Mar10 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. 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.