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earned this badge 27 times.
Which closed subsets $Y$ of a compact space $X$ admit a linear extensor $C(Y)\to C(X)$?
Awarded Feb 22 at 8:07
Is every real number in [0,1] a product of three (or more) Cantor set's numbers?
Awarded Dec 22, 2023 at 18:33
The different Branches of Arithmetic
Awarded Dec 10, 2022 at 19:57
Fundamental Theorem of Algebra via multiple integrals
Awarded Jan 28, 2021 at 20:55
Why the sequence of Bernstein polynomials of $\sqrt x$ is increasing?
Awarded Jan 16, 2021 at 21:41
Connecting a compact subset by a simple curve
Awarded Jan 13, 2021 at 18:05
Convex curves with many inscribed triangles maximizing perimeter
Awarded Nov 22, 2019 at 17:30
Bijections $\mathbb{Z}\times\mathbb{Z}\to\mathbb{Z}$ with vanishing local means
Awarded Oct 24, 2019 at 22:25
What are the applications of the Mazur-Ulam Theorem?
Awarded Oct 14, 2019 at 4:50
Between Tietze's and Dugundji's extension theorems
Awarded Jun 3, 2016 at 9:29
Best Hölder exponents of surjective maps from the unit square to the unit cube
Awarded Jan 8, 2016 at 21:18
The closures in $C^0(\mathbb{R}, \mathbb{R})$ of the set of integer valued polynomials, resp, of polynomials with integer coefficients
Awarded May 18, 2015 at 2:24
Including a Jordan arc into a Jordan loop (Can the Magi go home by another way?)
Awarded Mar 3, 2015 at 19:39
Ergodic limits along subsets of $\mathbb{N}.$
Awarded Jul 15, 2013 at 14:50
Genealogy of the Lagrange inversion theorem
Awarded Nov 23, 2012 at 22:05
Periodic orbits and polynomials
Awarded Sep 25, 2012 at 12:20
Maximizing the volume in a family of subsets of a cube
Awarded Jan 13, 2012 at 7:35
Banach spaces with few linear operators ?
Awarded Oct 18, 2011 at 13:35
Asymptotic growth of a certain integer sequence
Awarded Sep 6, 2011 at 17:20
Closed connected additive subgroups of the Hilbert space
Awarded Sep 5, 2011 at 22:35
The functional equation $f(f(x))=x+f(x)^2$
Awarded Aug 17, 2011 at 7:05
Infinite convex combinations in a Banach space
Awarded Apr 19, 2011 at 22:20
A puzzle about finding three points $(x,y)$, $(x,z)$ and $(y,z)$ in a subset of a square.
Awarded Feb 25, 2011 at 17:05
Integral representation of higher order derivatives
Awarded Dec 17, 2010 at 18:35
Intersection of complemented subspaces of a Banach space
Awarded Oct 4, 2010 at 19:05
Reference request: an elementary proof of Brouwer fixed-point theorem.
Awarded Aug 29, 2010 at 20:50
I know that you know...
Awarded May 21, 2010 at 21:50

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