1969/65/1

Berandungen gruppentheoretischer Eigenschaften

Strongly cellular cells in ${\displaystyle E^3}$ are tame

Finitely additive measures and the first digit problem

Metrizability of trees

A dense set of sewings of two crumpled cubes yields ${\displaystyle S^3}$

A note on inverse binary operation in abelian groups

A generalized version of the Vietoris-Begle Theorem

Open and closed mappings and compactification

On ω-models which are not β-models

An extended arithmetic of ordinal numbers