In this note we give sufficient conditions to ensure that the weak Finsler structure of a complete C Finsler manifold M is determined by the normed algebra C b (M) of all real-valued, bounded and C k smooth functions with bounded derivative defined on M . As a consequence, we obtain: (i) the Finsler structure of a finite-dimensional and complete C Finsler manifold M is determined by the algebra...

We characterize compact composition operators on real Banach spaces of complex-valued bounded Lipschitz functions on metric spaces, not necessarily compact, with Lipschitz involutions and determine their spectra.

We use the canonical Lipschitz geometry available on the boundary of a hyperbolic group to construct finitely summable Fredholm modules over the crossed product of the boundary action. The procedure yields a full set of representatives of the K-homology of the crossed product, and all of them are p-summable for p in an appropriate range related to the geometry of the boundary. By restricting th...

We consider how a vertex operator algebra can be extended to an abelian intertwining algebra by a family of weak twisted modules which are simple currents associated with semisimple weight one primary vectors. In the case that the extension is again a vertex operator algebra, the rationality of the extended algebra is discussed. These results are applied to affine Kac-Moody algebras in order to...

C λ-extended oscillator algebra and parasupersymmetric quantum mechanics Abstract The C λ-extended oscillator algebra is generated by {1, a, a † , N, T }, where T is the generator of the cyclic group C λ of order λ. It can be realized as a generalized deformed oscillator algebra (GDOA). Its unirreps can thus be easily exhibited using the representation theory of GDOAs and their carrier space sh...

An isomorphism is established between the plethystic Hopf algebra Pleth(Super[L]) and the algebra of vector symmetric functions. The Hall inner product of symmetric function theory is extended to the Hopf algebra Pleth(Super[L]).

A metric space X is said to be absolutely Lipschitz extendable if every Lipschitz function f from X into any Banach space Z can be extended to any containing space Y ⊇ X , where the loss in the Lipschitz constant in the extension is independent of Y , Z, and f . We show that various classes of natural metric spaces are absolutely Lipschitz extendable. c © 2003 Académie des sciences/Éditions sci...

Recent characterizations of various types of diierentiable generalized monotone maps by Karamardian{ Schaible{Crouzeix and their strengthened versions by Crouzeix{Ferland are extended to the nonsmooth case. For nondiierentiable locally Lipschitz maps necessary and/or suucient conditions for quasimono-tonicity, pseudomonotonicity and strict/ strong pseudomonotonicity are derived. To accomplish t...

Abstract: In the context of a finite measure metric space whose measure satisfies a growth condition, we prove ”T 1” type necessary and sufficient conditions for the boundedness of fractional integrals, singular integrals, and hypersingular integrals on inhomogeneous Lipschitz spaces. We also indicate how the results can be extended to the case of infinite measure. Finally we show applications ...