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theorem proved term proof

cross_cousin_half

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formal statement (Lean)

 122theorem cross_cousin_half :
 123    2 * (KinshipSystem.all.filter isCrossCousin).length =
 124    KinshipSystem.all.length := by

proof body

Term-mode proof.

 125  rw [cross_cousin_count, KinshipSystem.all_length]
 126
 127/-! ## §4. Master certificate -/
 128

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depends on (12)

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