lean2/tests/lean/let2.lean
Leonardo de Moura 935c2a03a3 feat(*): change name conventions for Lean builtin libraries
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
2014-01-05 19:21:44 -08:00

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-- Annotating lemmas
theorem simple (p q r : Bool) : (p ⇒ q) ∧ (q ⇒ r) ⇒ p ⇒ r :=
discharge (λ H_pq_qr, discharge (λ H_p,
let P_pq : (p ⇒ q) := and::eliml H_pq_qr,
P_qr : (q ⇒ r) := and::elimr H_pq_qr,
P_q : q := mp P_pq H_p
in mp P_qr P_q))
print environment 1