I still have a hard time understanding what an isomorphism is... I also think it might be hard to remember how the homomorphism part changes based on the 2 different operations that G and H could have.
Reflective:
For rings, there were 2 parts to a homomorphism, but for groups there is only 1. I suppose that's because there is only 1 operation on a group, it could be addition or multiplication (or something else that we define).
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