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Feb 21, 2013 at 8:51 history edited Johannes Ebert CC BY-SA 3.0
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Jan 29, 2013 at 17:06 comment added Johannes Ebert But the differentials $d$ and $e$ preserve the number $p+q$ (make a picture of the bigraded algebra to see this).
Jan 29, 2013 at 10:52 comment added ACL NB. $p+q$ is not a constant non-zero element of $K$, so the easy lemma needs to be slightly modified. Moreover, the hypothesis that the characteristic of $K$ is zero is unnecessary in the lemma, but crucial for the case you study.
Jan 29, 2013 at 10:03 history answered Johannes Ebert CC BY-SA 3.0