Boletín de la Sociedad Matemática Mexicana (2)

Alberto Alonso y Coria and Jose A. Canavati
Some spectral properties of positive operators on a Banach space
pages 1-13

Luis Astey and Donald M. Davis
Nonimmersion of real projective spaces implied by BP
pages 15-22

Mohamed Lamei El-Mallah et Artibano Micali
Sur les algèbres normées sans diviseurs topologiques de zéro
pages 23-28

José Adem
On the Hurwitz problem over an arbitrary field I
pages 29-51

Agripino García
Sobre el orden del mapeo de pegue de las celdas en CP_n^n+k
pages 53-57

R. Michael Porter
Functions convex in two directions
pages 59-61

Luis G. Gorostiza and Norman Kaplan
Invariance principle for branching random motions
pages 63-86