File: ring.v

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(* This example, checks the efficiency of the abstract machine used by ring *)
(* Expected time < 1.00s *)

Require Import ZArith.
Open Scope Z_scope.
Goal forall a, a+a+a+a+a+a+a+a+a+a+a+a+a = a*13.
Timeout 5 Time intro; ring.
Abort.