Geodesic

Volume 9 (1997) no. 6

Sommaire

On monotone families of $J$-contractive matrix functions
p. 3-37
Direct and inverse spectral problems for a Jacobi field
p. 38-61
The discrete spectrum in gaps of the perturbed periodic Schr\"odinger operator.~II. Nonregular perturbations
p. 62-89
Operator approach to approximation problems
p. 90-108
Estimates for first-order derivatives for solutions of some classes of non-totally parabolic equations
p. 109-131
Dichotomy and stability of undetermined nonlinear systems in Hilbert spaces
p. 132-155
Uniform approximation by harmonic differential forms. A constructive approach
p. 156-196
A representation for the spectral shift function in the case of perturbations of fixed sign
p. 197-213
The Cwikel--Lieb--Rozenblyum estimator for generators of positive semigroups and semigroups dominated by positive semigroups
p. 214-236