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Refinements of Kool-Thomas Invariants via Equivariant $K$-theoretic invariants
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abstract
In this article we are defining a refinement of Kool-Thomas invariants of local surfaces via the equivariant $K$-theoretic invariants proposed by Nekrasov and Okounkov. Kool and Thomas defined the reduced obstruction theory for the moduli of stable pairs $\mathcal{P}_{\chi}(X,i_{*}\beta)$ as the degree of the virtual class $\left[\mathcal{P}_{\chi}(S,\beta)\right]^{red}$ after we apply $\tau([pt])^{m}\in H^{*}(\mathcal{P}_{\chi}(X,i_{*}\beta),\mathbb{Z})$. $\tau([pt])$ contain the information of the incidence of a point and a curve supporting a $(\mathcal{F},s)$. $\textbf{Keywords: }$Kool-Thomas invariants, $K$-theoretic invariants, G\"ottsche Shende invariants
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BPS polynomials and Welschinger invariants
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