1990/136/3

End-extending models of ${\displaystyle I{\Delta }_0+\exp +{\rm B}{\Sigma }_1}$

There arc uncountably many homeomorphism types of orbits in flows

Natural continuity space structures on dual Heyting algebras

The Ramsey sets and related sigma algebras and ideals

Embedding of Boolean algebras in Ρ(ω)/fin

On bounded paradoxical subsets of the plane