fact: Definition laxrightunitor_to_runitor_data {C : category} {tu : tensor_unit C} (ru : laxrightunitor tu) : rightunitor_data tu tu := pr1 ru.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Monoidal.WhiskeredBifunctors UniMath.CategoryTheory.Monoidal.Categories