Tensor products of bimodules and bimodule pairs over monoids

Abstract

We modify the well-known tensor product of modules over a semiring, to provide a general theory encompassing the classical theory of tensor products over algebras, tropical structures, and hyperfields. We discuss tensor products from three viewpoints: tensor extensions, tensor products of modules and bimodules over monoids, and tensor products of semi-algebras. The tensor product of residue hypermodules is functorial with respect to this construction. Special attention is paid to different kinds of morphisms and the connection to the work of Nakamura and Reyes.

arXiv comment20 pages. Expanded introduction. More information about homomorphisms, and about the residue hypermodules is included in this version, and there are more motivational examples. However, the theorems on free modules were deleted