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theorem proved term proof

oneDimSubspace_card

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formal statement (Lean)

 244theorem oneDimSubspace_card (v : F2Power D) (hv : v ≠ 0) :
 245    (oneDimSubspace v).card = 2 := by

proof body

Term-mode proof.

 246  unfold oneDimSubspace
 247  simp [Finset.card_insert_of_notMem, Ne.symm hv]
 248
 249/-- The 1-dimensional subspace is closed under addition. -/

depends on (6)

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