fact: Definition DP_resizeb_condition s := nilp s || ((all DP_FT_DH1 (behead s)) && (DP_FT_DH1 (head nil s) || (DP_ph1_aux2 (head nil s)))).
imports: mathcomp(ssreflect ssrfun ssrbool eqtype) mathcomp(ssrnat seq path div) mathcomp(fintype tuple finfun bigop finset binomial)