"Gérard H. E. Duchamp" <gheduchamp@gmail.com> 		 hide details	 3 Apr (1 day ago) 
	to		Walter van Suijlekom <waltervs@math.ru.nl>	 
	cc		Tollu Christophe <Christophe.Tollu@lipn.univ-paris13.fr>	 
	date		3 Apr 2008 07:52	 
	subject		Re: Reminder: Proceedings MPIM Bonn 2006+2007	 
	mailed-by		gmail.com	 
Dear Organizer,

Thank you for the reminder. This is for the
"Conference on Combinatorics and Physics", March 19-23, 2007.

My contribution, with Christophe Tollu, is the following:

Title : Sweedler's duals and Schützenberger's calculus
Gérard H. E. Duchamp, Christophe Tollu

Abstract : We describe the problem of Sweedler's duals for bialgebras as
essentially characterizing the domain of the transpose of the multiplication.
This domain is the set of what could be called ``representative linear forms''
which are the elements of the algebraic dual which are also representative on
the multiplicative semigroup of the algebra.

I will (maybe with my colleague) also possibly (we were two speakers, please
tell me if it is OK) contribute a short note
"On the use of rational expressions in Combinatorial Physics".

Abstract : In a joint work with J. Katriel, one of us gave the solution of
the problem of matrix coefficients in the Fock space of carriers between
two levels. We give here a complete proof of these continued fractions-type
formulas and possible extensions of the method. 

Best regards
Gérard H. E. Duchamp