from	Hoang.Ngocminh@lipn.univ-paris13.fr
to	"Gérard H. E. Duchamp" <gheduchamp@gmail.com>
cc	Allan Solomon <a.i.solomon@open.ac.uk>,
Deneufchâtel <matthieu.deneufchatel@lipn.univ-paris13.fr>
date	22 January 2011 21:13
subject	Re: Version 12_1.
mailed-by	lipn.univ-paris13.fr
	
hide details 21:13 (27 minutes ago)
	
Dear all,

1/ In page 2, $\cal H$ is used twice but it is not defined yet.

2/ In page 3, after Formula (13), it is better to give, as example, the derivation $\bf d$ on the Chen generating series $C$ given in Formula (5) to obtain the differential equation

\begin{equation}
{\bf d}C=\biggl(\sum_{i=0}^m\frac{x_i}{z_a_i}\biggr)C.
\end{equation}

explaining then the link with the multiplier $M$ given in the following Theoerem.

best regards,
Minh

Laboratoire d'Informatique de Paris-Nord
UMR CNRS 7030
Institut Galilée - Université Paris-Nord
99, avenue Jean-Baptiste Clément 
93430 Villetaneuse