User Ivan Feshchenko - MathOverflow Meta

Ivan Feshchenko

Member for 9 years, 6 months
Last seen more than 1 year ago

Kyiv, Ukraine

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Feb 10, 2022

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28

Can a countable union of two-element sets be uncountable?

19

Can we take a supremum over all Hilbert spaces?

8

Continuous linear functionals and the Axiom of Choice

5

Extension of bounded linear operators

5

Inverse marginal property of a collection of $\sigma$-algebras