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KCd
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Apparently, this user prefers to keep an air of mystery about them.

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22 Why are quaternions more popular than tessarines despite being non-commutative? Feb 14
16 Why do I , J and K in mechanics represent X , Y and Z in maths? Dec 28 '20
15 Apparently different objects discovered to be the same Jan 22 '15
14 A basic mistake by Cayley Nov 12 '17
13 Notation for Christoffel symbols Nov 18 '18
11 How were derivatives of trigonometric functions first discovered? Dec 6 '15
11 Who first introduced the notation $\mathcal{O}$ in algebraic geometry or algebraic number theory Oct 15 '15
10 Notation from Weyl's algebraic number theory book Jan 19 '20
9 First use of term "Hilbert's Nullstellensatz" Apr 24
9 Riemann's moduli and Dedekind's modules: any connection? May 12 '18
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