I am reading Dummit and Foote Chapter 10: Introduction to Module Theory.(adsbygoogle = window.adsbygoogle || []).push({});

I am having difficulty seeing exactly why a conclusion to Proposition 27 that D&F claim is "immediate":

I hope someone can help.

Proposition 27 and its proof read as follows:

In the first line of the proof (see above) D&F state the following:

"The fact that [itex] \psi [/itex] is a homomorphism is immediate."

Can someone please explain exactly why [itex] \psi [/itex] is a homomorphism?

Would appreciate some help.

Peter

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# (Apparently) simple question rearding module homomorphisms

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