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Martin Sleziak's user avatar
Martin Sleziak's user avatar
Martin Sleziak
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31
Can the supremum of continuous functions be discontinuous at every point of an interval?
Sep 1, 2018
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29
Dual space of $\ell^\infty$
Mar 22, 2011
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23
A good reference to the general Chinese Remainder Theorem
Nov 21, 2017
question
21
Characterization of Fréchet-Urysohn spaces using sequential continuity at a point
Jul 16, 2013
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19
"Rocket elements" in bijections $f:\mathbb{N}\to \mathbb{N}$
Jul 14, 2019
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19
Arranging all permutations on $\{1,\ldots,n\}$ such that there are no common points
May 29, 2019
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12
Density of a set of natural numbers whose differences are not bounded.
May 27, 2011
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12
BCT equivalent to DC
Oct 3, 2020
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11
Density-$c_0$ in $\ell^\infty$
Oct 30, 2018
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9
Is the Rudin-Keisler order of ultrafilters linear?
Feb 27, 2011
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Will ads appear on MO?
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My question was closed on MO because it is not research level. Where should I ask instead?
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Would newly elected moderators join the board of MathOverflow Inc.?
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Overview of basic results about images and preimages
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Overview of basic results about images and preimages
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Overview of basic facts about Cauchy functional equation
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Overview of basic facts about Cauchy functional equation
117
Let $X$ be an infinite dimensional Banach space. Prove that every Hamel basis of $X$ is uncountable.