We define regularised Poisson brackets for the monodromy matrix of classical string theory on R × S 3. The ambiguities associated with Non-Ultra Locality are resolved using the symmetrisation prescription of Maillet. The resulting brackets lead to an infinite tower of Poisson-commuting conserved charges as expected in an integrable system. The brackets are also used to obtain the correct symple...

This paper proposes a nonparametric efficiency measurement approach for the static portfolio selection problem in a general inputs-outputs space, where inputs can include variance and kurtosis and outputs can include mean and skewness. Our work is in the vein of Briec, Kerstens and Jokung (2007) and Jurzenko, Maillet and Merlin (2006) who develop a directional distance (shortage function) appro...

An accurate quantitative definition of financial crisis requires a universal and robust scale for measuring market shocks. Following Zumbach et al. (2000) and Maillet et Michel (2003), we propose a new quantitative measure of financial disturbances, which captures the heterogeneity of investor horizons – from day traders to pension funds. The indicator resides on a multi-resolution analysis of ...

We extend the work which has appeared in papers on sharp characters and originated with Blichfeldt and Maillet to the Burnside ring of a finite group G. We show that the polynomial whose zeros are the set of marks of non-identity subgroups on a faithful G-set X evaluated at X is an integral multiple of the regular G-set, and deduce a result about the size of a base of X . Further consequences f...