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Feb 1, 2014 at 20:44 comment added Theo Johnson-Freyd One correction: I think my proof for 4 depends on earlier $\pi_k$s vanishing. I don't know whether 4 is true as stated.
Feb 1, 2014 at 20:37 answer added Fernando Muro timeline score: 3
Feb 1, 2014 at 19:27 history asked Theo Johnson-Freyd CC BY-SA 3.0