An Application of Model Theory to Semimodules

Logic Journal of the IGPL 16 (1):99-102 (2008)
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Abstract

In this note, we prove that the theory T of cancellative semimodules over a semiring R has the amalgamation property. If R is an entire cancellative zerosumfree semiring, then T has no model-companion. In particular, the theory of commutative additively cancellative monoids forms an example of a non-companionable theory

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