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Top Posts

  • Basic Category Theory, II
  • Platonic Solids and Euler's Formula for Polyhedra
  • Free Boolean algebras, truth tables, disjunctive normal form, and completeness theorems
  • Number of idempotent endofunctions
  • High IQ and Mathematics
  • Problem-Solving Hall of Fame!
  • POW-1: An "elementary" divisibility problem
  • Solution to POW-3: Summing reciprocals of binomial coefficients
  • Mason-Stothers Theorem and the ABC Conjecture
  • Inclusion-Exclusion Principle: Counting all the objects outside the oval regions!
  • Ultrafilter convergence, compactness, and the spectrum of a Boolean algebra
  • POW-11: Preserving sums of squares

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