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Timeline for Does H-supplmented module have D2?

Current License: CC BY-SA 4.0

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May 31, 2020 at 0:49 comment added mme @HajerBagdady The claim is that it's not D2. Take $A = (\Bbb Z/2\Bbb Z, 2\Bbb Z/4\Bbb Z)$. If this was a direct summand the module would be isomorphic to $(\Bbb Z/2)^3$.
May 31, 2020 at 0:35 comment added Hajer Bagdady Thanks for you reply, I don't see why it's D2. Could you please explain?
May 30, 2020 at 21:42 history answered Jeremy Rickard CC BY-SA 4.0