Let and . If their composition is injective and is injective, I know that does not necessarily need to be injective. Could you please help me find an example of this? Thanks!

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- Sep 24th 2009, 10:06 PMLast_SingularityB & AB injective but A not injective
Let and . If their composition is injective and is injective, I know that does not necessarily need to be injective. Could you please help me find an example of this? Thanks!

- Sep 24th 2009, 11:33 PMNonCommAlg