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lemma proved term proof

card_pattern

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formal statement (Lean)

  36lemma card_pattern (d : Nat) : Fintype.card (Pattern d) = 2 ^ d := by

proof body

Term-mode proof.

  37  classical
  38  simp [Pattern, Fintype.card_fin] at*
  39
  40/-- No surjection to all d-bit patterns if T < 2^d. -/

used by (5)

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depends on (10)

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