Stuart Popejoy sirlensalot
lf94
/ andb_eq_orb.v
Created
August 9, 2020 22:28
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| Theorem andb_eq_orb : | |
| forall (b c : bool), | |
| (andb b c = orb b c) -> | |
| b = c. | |
| Proof. | |
| intros b c. | |
| destruct b eqn:Eb. | |
| - destruct c eqn:Ec. | |
| + reflexivity. |
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| Inductive day : Type := | |
| | monday : day | |
| | tuesday : day | |
| | wednesday : day | |
| | thursday : day | |
| | friday : day | |
| | saturday : day | |
| | sunday : day. | |
| Definition next_weekday (d:day) : day := |