fact: Definition prod_from_underlying_arr_map (f : I_{V} --> BPV (E ⦃ w , x ⦄) (E ⦃ w, y ⦄)) : I_{V} --> E ⦃ w, a ⦄.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Monoidal.Categories UniMath.CategoryTheory.EnrichedCats.Enrichment UniMath.CategoryTheory.Limits.BinProducts