Timeline for Does H-supplmented module have D2?
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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 |