fact: Definition bin_invert_alt L:= let l := bin_invert_aux L in if l is a :: l' then rcons (belast a l') true else l.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq choice fintype order bigop ssralg) mathcomp(div ssrnum ssrint rat prime path binomial) mathcomp(tuple finset) gaia(fibm)