Eduardo González

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This article deals with efficiency improvement and how to identify appropriate benchmarks for inefficient firms to imitate. We argue that the most relevant benchmark is the most similar efficient firm. Having interpreted similarity in terms of input endowments, the problem reduces to find the closest reference firm on the efficient subset of the isoquant.(More)
In this paper we describe a method to establish when a symplectic 6-manifold M with semi-free Hamiltonian S 1-action is unique up to isomor-phism (equivariant symplectomorphism). This method will rely on a study of the symplectic geometry of the reduced spaces and a gluing procedure along regular levels. We prove that if the reduced spaces satisfy a(More)
We prove a quantum version of Kalkman's wall-crossing formula [34], [41] comparing intersection pairings on geometric invariant theory (git) quotients related by a change in polarization, under certain stable=semistable assumptions. The formula is the same, but each expression in the formula is quantized in the sense that it is replaced by an integral over(More)
We prove a quantum version of the localization formula of Witten [58], see also [56], [50], [60], which relates invariants of a git quotient with the equi-variant invariants of the action. As an application, we prove a quantum version of an abelianization formula of S. Martin [38], relating invariants of geometric invariant theory quotients by a group and(More)
We prove a gluing theorem for a symplectic vortex on a compact complex curve and a collection of holomorphic sphere bubbles. Using the theorem we show that the moduli space of regular strongly stable symplectic vortices on a fixed curve with varying markings has the structure of a stratified-smooth topo-logical orbifold. In addition, we show that the moduli(More)