Irving Segal's axiomatization of spacetime and its cosmological   consequences
  Irving Ezra Segal (1918-1998) has proposed some axioms for mathematical cosmology. These are here re-examined and Segal's redshift formula and energy conservation in the Einstein universe are established in full on their basis. A detailed table of contents appears at the end. 
Aubert Daigneault (Universite de Montreal, Canada)