bio  website  www2.unine.ch/alain.valette 

location  Neuchâtel, Switzerland  
age  55  
visits  member for  3 years 
seen  1 hour ago  
stats  profile views  4,176 
1h

awarded  Yearling 
Feb 20 
awarded  Enlightened 
Feb 20 
awarded  Nice Answer 
Jan 25 
answered  Learning about Lie groups 
Jan 23 
comment 
Why aren't fields called “bodies” instead?
A remark on local versions of french: the Belgians use "champ" (= field) for "corps commutatif", while the Swiss say as the French... 
Jan 19 
comment 
A question on lie groups( Lie algebras)
Take Sasha's example, and embed it into the simple Lie group $SU(3)$ (where $\mathbb{T}^2$ embeds as a maximal torus). 
Jan 12 
answered  Modern Mathematical Achievements Accessible to Undergraduates 
Jan 8 
comment 
Reflexive (hyperbolic) graphs
I see. Thanks for clarifying. 
Jan 8 
comment 
Reflexive (hyperbolic) graphs
Why are you using "hyperbolic" in the title? (for me, hyperbolic graphs are graphs which are hyperbolic when viewed as metric spaces, which seems irrelevant to your question...) 
Jan 8 
comment 
Which groups are the unitary group of a $C^*$algebra
You might also take the reduced C*algebra. But in my view it says nothing about the OP (with due respect). 
Jan 6 
comment 
Why we need to study representations of matrix groups?
@Andy: I agree that the question produced some good answers. On the other hand, this basic question should be answered in any introductory book in representation theory (even if it is not always so, unfortunately...) 
Jan 6 
comment 
Le Gall's equivariant KKtheory and twisted equivariant KKtheory
If you succeed in getting a copy of Le Gall's thesis (probably available from Le Gall), I sort of remember that it is more detailed than the paper... 
Jan 6 
comment 
Le Gall's equivariant KKtheory and twisted equivariant KKtheory
Have you tried this? portico.org/Portico/browse/access/… 
Jan 6 
comment 
Why we need to study representations of matrix groups?
This would be a good question for MathStackExchange. 
Jan 3 
comment 
On an asymptotic in Sarnak's book: “Some applications of modular forms”
Thanks Igor, we owe you a beer now! 
Dec 23 
comment 
$Z_{2}$ graded structures for $C_{red} ^{*} (F_{2})$
For $C(S^1)$, you also have the grading associated to the automorphism $z\mapsto z^{1}$ of $S^1$ (viewed as the group of complex numbers of modulus one). The subalgebra of elements of degree 0, is isomorphic to $C[1,1]$, proving that this grading is not isomorphic to the one by even/odd functions (which is associated to $z\mapsto z$). 
Dec 23 
comment 
$Z_{2}$ graded structures for $C_{red} ^{*} (F_{2})$
Have you considered the $\mathbb{Z}_2$grading associated with the involutive automorphism of $F_2$ obtained by flipping the generators? 
Dec 23 
comment 
Crossed Products by Permutation Groups
Yes, edited, thanks! 
Dec 23 
revised 
Crossed Products by Permutation Groups
edited body 
Dec 23 
answered  Crossed Products by Permutation Groups 