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Jan 5, 2013 at 0:39 comment added Martin Brandenburg More simple, $k[y] \otimes - \cong -[y]$ doesn't preserve products (column-finite matrices vs. matrices).
Jul 13, 2010 at 3:16 vote accept Theo Johnson-Freyd
Jul 13, 2010 at 0:21 history answered thel CC BY-SA 2.5