Ivan Feshchenko

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

Kyiv, Ukraine

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fa.functional-analysis

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

Feb 8, 2022

Can we take a supremum over all Hilbert spaces?

Nov 5, 2020

Continuous linear functionals and the Axiom of Choice

Oct 14, 2021

Completeness of the space $L^p$ and the Axiom of Countable Choice

Feb 3, 2022

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

Apr 22, 2020

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Kernel of a convex combination of projections

Sep 27, 2016

Existence of $f \in L^2(\Bbb R^n)$ with $f=g_1$ on $E$ and $\mathscr{F}(f)=g_2$ on $F$

Jan 30, 2021

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