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theorem proved term proof

tenfold_equicardinal

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formal statement (Lean)

  61theorem tenfold_equicardinal
  62    {A B : Type} [Fintype A] [Fintype B]
  63    (hA : HasTenFold A) (hB : HasTenFold B) :
  64    Fintype.card A = Fintype.card B := by

proof body

Term-mode proof.

  65  rw [hA, hB]
  66
  67/-- 10 × 10 = 100. -/

depends on (4)

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