Naive counts of rational curves in an affine log Calabi-Yau variety containing a torus uniquely determine a Frobenius algebra, now proved via non-archimedean analytic disk counting.
Mirror symmetry for log Calabi-Yau surfaces I
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We give a canonical synthetic construction of the mirror family to a pair (Y,D) of a smooth projective surface with an anti-canonical cycle of rational curves, as the spectrum of an explicit algebra defined in terms of counts of rational curves on Y meeting D in a single point. In the case D is contractible, the family gives a smoothing of the dual cusp, and thus a proof of Looijenga's 1981 cusp conjecture.
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The Frobenius structure theorem for affine log Calabi-Yau varieties containing a torus
Naive counts of rational curves in an affine log Calabi-Yau variety containing a torus uniquely determine a Frobenius algebra, now proved via non-archimedean analytic disk counting.