fact: Definition normq '(Rat x _) : rat := `|x.1|%:~R / (x.2)%:~R.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop order ssralg countalg div ssrnum) mathcomp(ssrint prime archimedean)