Geodesic

Volume 49 (1991) no. 6

Sommaire

Smoothness of solutions of second-order hyperbolic equations with discontinuous coefficients
p. 3-11
Summation of multiple trigonometric Fourier series
p. 12-18
Properties of the spectral function of a Sturm--Liouville operator with discontinuous coefficients
p. 19-28
Three-dimensional hyperbolic manifolds with general fundamental polyhedron
p. 29-32
Approximation of functions of class $C(\varepsilon)$ by sequences of de la Vall\'ee-Poussin sums
p. 33-41
Multi-phase solutions of the Benjamin--Ono equation and their averaging
p. 42-58
$C^r$-property and approximately differentiable functions
p. 59-62
1-cohomologies of a special linear group with coefficients in a module of truncated polynomials
p. 63-71
Approximations of compact sets of functions by piecewise polynomial surfaces in spaces of smooth functions
p. 72-81
Estimates of the singular numbers of Hankel operators
p. 82-86
Functionally balanced groups
p. 87-91
Periodic solutions of difference Runge--Kutta schemes
p. 92-97
Connection between the mixing properties of a flow and the isomorphicity of the transformations that compose it
p. 98-106
Fourier--Maslov transform in the space of multivalued analytic functions
p. 107-118
Properties of integral solutions of differential inclusions with $m$-accretive operators
p. 119-131
Best quadrature formulas for improper integrals on certain classes of differentiable functions
p. 132-134
A~pseudo-Euclidean representation of conditionally positive mappings
p. 135-137
Nonrecursiveness of the integral of a conditionally periodic function
p. 138-140
Integration of Hamiltonian systems on a separate isoenergetic surface
p. 140-142
Optimal control by random sequences with constraints
p. 143-145
$\mathscr C$-spectral sequence of evolution equations
p. 145-147
Letter to the editor