fact: Definition multimodule {I : UU} (rings : I -> ring) : UU := ∑ G (ms : ∏ i : I, module_struct (rings i) G), multimodule_struct ms.
imports: UniMath.Algebra.Modules.Core UniMath.Algebra.Groups UniMath.Algebra.Monoids UniMath.Algebra.RigsAndRings UniMath.Foundations.Preamble UniMath.Foundations.Sets