fact: Variables (TX : {RV P -> TA}) (TY : {RV P -> TB}) (TZ : {RV P -> TC}).
imports: mathcomp(all_ssreflect ssralg ssrnum matrix) mathcomp(Rstruct reals) Reals Lra ssrR Reals_ext realType_ext logb ssr_ext ssralg_ext bigop_ext fdist