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11
votes
Accepted
Is P^2 important in Kontsevich's recursion formula?
The Kontsevich recursion formula is not special to $\mathbf{CP}^2$. It is a particular application of the more general associativity formula for quantum cohomology, which is something true for symplec …
7
votes
Simple examples of Gromov-Witten invariants not being enumerative
I'm not sure if this is quite what you're looking for, but I always found it a useful example to keep in mind. Take the genus 1 invariant for degree 1 maps into $P^1$. There are no degree 1 holomorphi …