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edited Jul 22, 2019 at 11:24

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A reference would be Pandharipande's ICM address Cohomological field theory calculations, section 1.3. The $R$-matrix is $$ R(z)=\exp\bigg(-\sum_{k=1}^\infty \frac{B_{2k}}{2k(2k-1)}z^{2k-1}\bigg). $$

answered Jul 22, 2019 at 9:58

ssx

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