Volume 20 (1974) no. 2

Table of contents

La théorie des catastrophes. I. La machine à catastrophes
p. 113-134
La théorie des catastrophes. II. Dynamiques gradientes à une variable d'état
p. 135-151
On the validity of Huygens' principle for second order partial differential equations with four independent variables. Part I : derivation of necessary conditions
p. 153-188
Definite magnetofluid scheme in general relativity
p. 189-200
Unitary equivalence of local algebras in the quasifree representation
p. 201-209
Spectral properties of one-body relativistic spin-zero hamiltonians
p. 211-220