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From mathcomp Require Import all_ssreflect all_algebra.
Local Open Scope ring_scope.
Goal 2%:Q + 2%:Q = 4%:Q.
Proof. reflexivity. Qed.
Goal - 2%:Q = -1 * 2%:Q.
Proof. reflexivity. Qed.
Goal 2%:Q ^+ 2 = 4%:Q.
Proof. reflexivity. Qed.
Goal (-1)^-1 = -1 :> rat.
Proof. reflexivity. Qed.
Local Open Scope rat_scope.
Check 12.
Check 3.14.
Check -3.14.
Check 0.5.
Check 0.2.
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