1975-1976/90/3

When ε-boundaries are manifolds

Superpositions of transformations of bounded variation

Multi-valued maps of subsets of Euclidean spaces

Embedding Cantor sets in a manifold. III. Approximating spheres

Euler characteristics of 2-manifolds and light open maps

Souslin-Klееnе does not imply Beth

The kernel operation on subsets of a ${\displaystyle T_1}$-space

Filter characterizations of z-, C*-, and C-embeddings