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We give an explicit formula to compute the rotation number of anullhomologous Legendrian knot in contact (1/n)-surgery diagrams alongLegendrian links and obtain a corresponding result for the self-linking numberof transverse knots. Moreover, we extend the formula by Ding-Geiges-Stipsiczfor computing the d3-invariant to (1/n)-surgeries.

Computing rotation and self-linking numbers in contact surgery diagrams