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    $\begingroup$ Have you tried Require Import Arith. and then used that lemma by Nat.div_0_l? $\endgroup$
    – Hiroki Chen
    Commented Apr 7 at 17:12
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    $\begingroup$ Thank you, that solves my problem. I should have searched in Coq via Search or SearchPattern command instead $\endgroup$
    – The Circle
    Commented Apr 7 at 17:35
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    $\begingroup$ @HirokiChen: if you're so kind, please post your comment as an anwser, with a small working example demonstrating the solution. Thanks! $\endgroup$
    – Andrej Bauer
    Commented Apr 12 at 12:52
  • $\begingroup$ @AndrejBauer Sure :) $\endgroup$
    – Hiroki Chen
    Commented Apr 12 at 16:04