Finitely generated module

Finitely generated module over a module-finite K-monoid

Let 𝑇 be a Module-finite K-monoid and 𝑀 be a finitely generated 𝑇-module. Then 𝑀 is a finitely generated K-module. #m/thm/module

Prove

Let {𝑑𝑖}π‘šπ‘–=1 be an K-spanning set for 𝑇 and {π‘šπ‘–}𝑛𝑖=1 be a 𝑇-spanning set for 𝑀. Then

{π‘‘π‘–π‘šπ‘—:π‘–βˆˆβ„•π‘š,π‘—βˆˆβ„•π‘›}

is an K-spanning set for 𝑀, since any 𝑣 βˆˆπ‘€ may be expressed as an 𝑇-linear combination of π‘šπ‘—'s and the coΓ«fficients may then be expressed as linear combinations of 𝑑𝑖's.


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