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Alexey Ustinov
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Solving hard problems by easy methods

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Most intriguing mathematical epigraphs
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Rediscovery of lost mathematics
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Examples of unexpected mathematical images
Nov 12, 2016
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'Important' applications of p-adic numbers outside of algebra (and number theory).
Oct 29, 2013
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Is there a regular pentagon with a rational point on each edge?
Nov 25, 2023
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Rediscovery of lost mathematics
Apr 12, 2015
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Solve in positive integers: $n!=m(m+1)$
Sep 18, 2010
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"The Two Sheriffs" puzzle
Apr 17, 2015
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Applications of finite continued fractions
Dec 19, 2010
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The origin of Discrete `Liouville's theorem'
Nov 22, 2013
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Two Sheriffs and Eavesdroppers - 2
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Is there a cryptographic solution for this “dating protocol”?
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How hard is Self-DLOG?
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Fundamental unit in the ring of integers $\mathbb Z[\frac{1+\sqrt{141}}{2}]$