Vasilii Aleksandrovich Lyubetskii

Об эффективной компактности и сигма-компактности@@@Effective Compactness and Sigma-Compactness

Using the Gandy -- Harrington topology and other methods of effective descriptive set theory, we prove several theorems on compact and sigma-compact pointsets. In particular we show that any

Определимое счетное множество, не содержащее определимых элементов@@@A Countable Definable Set Containing no Definable Elements

\Sigma^1_1

Non-uniformizable sets of second projective level with countable cross-sections in the form of Vitali classes

set

Проблемы теоретико-множественного нестандартного анализа@@@Problems in set-theoretic nonstandard analysis

A

Reducibility of monadic equivalence relations

of the Baire space

О сводимости монадических отношений эквивалентности@@@Reducibility of Monadic Equivalence Relations

N^N

О некоторых классических проблемах дескриптивной теории множеств@@@On some classical problems of descriptive set theory

either is covered by a countable union of compact

On some classical problems of descriptive set theory

\Delta^1_1

Valuations and sheaves. On some questions of non-standard analysis

sets, or

Problems of set-theoretic non-standard analysis

A