1. Let R and S be commutative rings with unity, and let φ: R S be a ring homomorphism. If M is an S-module, prove that M is also an R-module if we define rm = φ(r)m for all r E R and m E M.
2. If M1 and M2 are submodules of an R-module M such that M = M1(+)M2, prove that M1 = M/M2 and M2 = M/M1.© BrainMass Inc. brainmass.com March 4, 2021, 6:19 pm ad1c9bdddf
Please see the attached file for the full solution.
Thanks for using BrainMass.
To show that is an -module, we have to verify the following conditions.
(a) For any , , .
Since is an -module, then we have
(b) For any , ,
Since is a ...
Modules, Submodules , Commutative Rings with Unity and Homomorphism are investigated.