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user76284
  • Member for 9 years, 6 months
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31
Taking a theorem as a definition and proving the original definition as a theorem
Sep 27, 2021
answer
16
Notation for the set of all injections from $A$ into $B$
Oct 25, 2019
question
14
"Inner product" between prime factorizations
Mar 17, 2018
question
14
Projective-invariant differential operator
Jan 10, 2019
question
14
Can the axiom of choice be expressed in 4 quantifiers?
Nov 24
question
12
Harvey Friedman's minimalist axioms for set theory
Sep 27, 2021
answer
12
Mathematics based only on real numbers
May 22, 2020
question
12
Is there a $\Pi_2$ sentence $A$ such that $\text{ZFC}^- + A$ proves powerset?
Nov 20
answer
9
Emergence of the discrete from the continuum
Aug 27, 2020
answer
8
When is 2 qualitatively different from 3?
Nov 10