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May 25, 2011 at 14:30 comment added Theo Johnson-Freyd Ah, great, that was the argument I was missing. What I wanted to say in 3 was simply that any time I have a commutative algebra, I can talk about derivations thereof, and these should fit together into a "tangent bundle".
May 25, 2011 at 9:07 history answered S. Carnahan CC BY-SA 3.0