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Jul 3, 2021 at 19:33 vote accept Ben C
Jun 30, 2021 at 15:22 history edited Ben C CC BY-SA 4.0
added 511 characters in body
Jun 29, 2021 at 23:08 comment added Fernando Muro You probably want to specify that x and y have endomorphism ring Z and composition is "trivial" in the sense that it is given by the Z-module structure on any abelian group.
Jun 29, 2021 at 19:08 history edited მამუკა ჯიბლაძე CC BY-SA 4.0
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Jun 29, 2021 at 18:45 history answered Ben C CC BY-SA 4.0