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8 lines
222 B
Plaintext
8 lines
222 B
Plaintext
Nat.lemma.bft
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: ∀(n: Nat)
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(Equal Nat (Nat.half (Nat.double n)) n)
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= λn (~n λx(Equal Nat (Nat.half (Nat.double x)) x)
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λn(Equal.apply Nat Nat Nat.succ (Nat.half (Nat.double n)) n
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(Nat.lemma.bft n))
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λP λa a)
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