tiated by

XITUTE OF PHYSICS

:HOLAS COPERNICUS IVERSITY RUi;l

D THE POLISH YSICAL SOCIETY

Quarterly Volume 4 Number 1 March 1973

EDITORS (Torurij

S. Dembiriski (Managing Editor) R. S. Ingarden (Editor-in-Chici)

S. Pruski E. Sqsiada

EDITORIAL BOARD

Yu. M. Berezanski (Kiev) I. Biatynicki-Birula (Warsaw)

K. M. Case (New York, New York) A. J. Coleman (Kingston, Ontario)

Z. Dar&y (Debrecen) A. Grossmann (Marseilie!

S. GuiaSu (Bucharest) N. G. van Kampen (Utrecht)

J. R. Klauder (Murray Hill, New Jersey) J. T. topuszatiski (Wroctaw!

K. IMaurin (Warsaw) J. ?Xeixner (Aachen) J. Niederle (Prague)

W. Opechowski (Vancouver, British Columbia) R. Penrose’(London)

F. A. E. Pirani (London) J. Plebariski (Warsaw)

J. Rayski (Cracow) A. Rubinowicz (Warsaw)

J. Rzewuski (Wroctaw) F. SchlGgl (Xachen)

E. C. G. Sudarshan (Austin, Texas) W. Thirring (Vienna)

I. Todorov (Sofia) .4. Trautman (Warsaw)

A. Uhlmann (Leipzig) K. Urbanik (Wroctaw)

V. S. Varadarajan (Los Angeles, California) N. Ya. Vile&in (Moscow)

V. S. Vladimirov (Moscow)

<ORTH-HOLLAND PUBLlSHING COMPANY-AMSTERDAM * PWN-POLISH SCIENTIFIC PUBLISHERS-WARSZAWA