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Require Import Coq.Arith.Arith.
Ltac case_max :=
match goal with [ |- context[max ?x ?y] ] =>
destruct (le_dec x y);
match goal with
| [ H : (?x <= ?y)%nat |- context[max ?x ?y] ] => rewrite Max.max_r by
(exact H)
| [ H : ~ (?x <= ?y)%nat |- context[max ?x ?y] ] => rewrite Max.max_l by
(exact (le_Sn_le _ _ (not_le _ _ H)))
end
end.
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