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Ashutosh's user avatar
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Ashutosh
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174
Does every non-empty set admit a group structure (in ZF)?
Jan 26, 2010
37
If any open set is a countable union of balls, does it imply separability?
Sep 19, 2014
25
Definable collections without definable members (in ZF)
Jan 1, 2010
23
A question about small sets of reals
Apr 15, 2014
20
A question about sigma algebras and rectangles
Jan 5, 2017
19
On statements independent of ZFC + V=L
Jan 12, 2010
19
How quickly can the derivative of an everywhere differentiable function change sign?
Apr 4, 2017
17
Sierpinski's construction of a non-measurable set
Dec 22, 2014
16
Does there exist an uncountable partition of a Polish space so that the union of any collection of blocks is Borel?
Aug 18, 2015
16
Universal locally countable partial order
May 28, 2019
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Is there a topology $T$ on the set of complex numbers such that the class of $T$-continuous functions and the class of analytic functions coincide?
31
Example where union of increasing sigma algebras is not a sigma algebra
15
Putnam 1990: Problem A-4
13
Outer measure is not finitely additive
13
Subset of plane with measure $1$ in all lines