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There is a page named "Hopfian module" on Wikipedia
- been studied in the categories of groups, rings, modules, and topological spaces. The terms "hopfian" and "cohopfian" have arisen since the 1960s, and...6 KB (842 words) - 10:38, 15 April 2024
- is a Hopfian module. Similarly, an Artinian module M is coHopfian: any injective endomorphism f is also a surjective endomorphism. Any R-module is an...19 KB (2,837 words) - 22:51, 25 November 2023