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Jan 15, 2018 at 22:26 comment added cyc I was thinking about this problem too. Following the suggestion in this answer, I think I can get the surjectivity of $\Phi^0_A$ and $\Phi^1_A$ for all $A$, but I couldn't figure out the injectivity.
Mar 20, 2016 at 20:37 history answered hänsel CC BY-SA 3.0