theorem
proved
term proof
tenfold_equicardinal
show as:
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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. -/