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olivier dot begassat dot cours at gmail dot com


Mar
20
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?
Mar
20
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.
Mar
20
answered Is there any point-set definition of simple connectedness?
Mar
19
answered Prove that if $n$ is composite, then $(n-1)! \equiv 0 \pmod n$
Mar
19
comment Prove that if $n$ is composite, then $(n-1)! \equiv 0 \pmod n$
What have you tried?
Mar
17
awarded  Revival
Mar
12
reviewed Close The property of positive fourier series.
Mar
11
comment Property about splitting Conjugacy class of $S_n$
Related question : math.stackexchange.com/questions/144686/…
Mar
11
comment Property about splitting Conjugacy class of $S_n$
For the first point, it is because $A_n$ has index 2 in $S_n$.
Mar
10
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.
Mar
6
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.
Mar
4
answered Non-isomorphic Group Structures on a Topological Group
Mar
4
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.
Mar
4
revised Euler's totient function of 18 - phi(18)
Added an s to the command \cdot
Mar
4
revised Non-isomorphic Group Structures on a Topological Group
Added a space.
Mar
3
comment What does permutation stand for as a power?
Probably conjugation : given two permutations $x,y$, one sometimes writes $x^y$ for $y^{-1}xy$.
Mar
2
reviewed Close Choosing $5$ cards from a deck of $52$ cards
Mar
2
reviewed Close Nilpotent Subring
Mar
2
reviewed Close Proving density of $\mathbb{Q}^n$ in $\mathbb{R}^n$
Mar
1
comment Is this Chinese card game solved?
You can modify your question.