1981/113/1

More Lusin properties in the product space ${\displaystyle S^n}$

A characterization of expandability of models for ZF to models for KM

Tychonoff's theorem without the axiom of choice

Theorems on common fixed points

On the metrizability of ${\displaystyle F_{p}p}$-spaces and its relationship to the normal Moore space conjecture

The equivalence of definable quantifiers in second order arithmetic

Coincidence of maps in Q-simplicial spaces