For another thread https://www.physicsforums.com/showthread.php?p=4420542 , I want to give simple motivations for the definition of two groups being isomorphic and related topics. My explanations have become so lengthy that I decided to post them here in 3 parts. ( They are probably too elementary for most readers of the other thread and that thread is already long.)(adsbygoogle = window.adsbygoogle || []).push({});

I've read an explanation similar to mine somewhere. It made the reader work harder to find the isomorphisms. I picked notation that makes one of them blatantly obvious.

The 3 messages will follow. Maybe they will be helpful to someone -and maybe they need some fixing.

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# Def. of groups being isomorphic - some motivation.

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