Boletín de la Sociedad Matemática Mexicana (2)

Humberto Cárdenas
El álgebra de cohomología del grupo simétrico de grado p²
pages 1-30

J. L. Arraut
Limit sets and periodic orbits
pages 31-41

J. L. Arraut
Topologías que caracterizan un flujo continuo
pages 42-45

Guillermo Restrepo
Differentiable norms
pages 47-55

Nam P. Bhatia
Weak attractors in dynamical systems
pages 56-64

Yuen-Fat Wong
Homotopy types of differentiable manifolds
pages 65-72

W. A. Sutherland
Homotopy-smooth sphere fibrings
pages 73-79

Mark Mahowald
A Samelson product in SO(2n)
pages 80-83

J. Adem, S. Gitler and M. Mahowald
Embedding and immersion of projective spaces
pages 84-88