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First to answer and accepted with score of 10 or more. This badge can be awarded multiple times.

earned this badge 19 times.
Does this expression always vanish?
Awarded Sep 24, 2023 at 4:25
a problem in complex-variable inequality
Awarded Nov 9, 2022 at 21:25
Gromov-Hausdorff distance between a disk and a circle
Awarded May 23, 2022 at 3:55
Sum of commuting semisimple operators
Awarded Sep 6, 2021 at 19:30
An elementary inequality for three complex numbers
Awarded Oct 27, 2020 at 14:06
Sum over 0-1 matrices
Awarded May 30, 2020 at 5:04
High sum of fractional parts
Awarded May 12, 2020 at 10:26
When can this condition on linear codes be satisfied?
Awarded Oct 20, 2019 at 12:50
The limit superior of $\varphi(2^n-1)/(2^n-1)$
Awarded Oct 18, 2017 at 13:49
Cancelling a graph join from a graph homomorphism
Awarded Sep 20, 2017 at 18:52
Convex polygonal tiling of the square such that every line intersects at most k polygons
Awarded Jun 12, 2017 at 1:03
Graphs with only disjoint perfect matchings
Awarded Apr 19, 2017 at 12:22
an identity for a sum over partitions
Awarded Dec 30, 2016 at 6:59
Is Квант the actual source of this problem?
Awarded Nov 16, 2016 at 18:28
Graphs in which any two odd cycles have a common vertex
Awarded Oct 16, 2015 at 12:49
Zero divisors with support of size 3 in group algebras of finite groups
Awarded Sep 1, 2015 at 21:14
Is there a bounded sequence of points in the plane with pairwise distances at least $1/\sqrt{|i-j|}$?
Awarded Nov 20, 2014 at 0:10
A differential inequality needed to prove a theorem about odd-dimensional souls
Awarded Oct 13, 2012 at 15:35
Integer solutions of x^n + y^n = z^{n-1}
Awarded Sep 15, 2011 at 22:35

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