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theorem proved term proof

card_eq

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formal statement (Lean)

 121theorem card_eq : Fintype.card (F2Power D) = 2 ^ D := by

proof body

Term-mode proof.

 122  unfold F2Power
 123  simp [Fintype.card_bool, Fintype.card_fin]
 124
 125/-- The number of non-zero vectors in `F2Power D` is `2 ^ D - 1`. -/

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depends on (10)

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