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We present a class of exactly solvable models of correlated electrons. Themodels are defined in any dimension $d$ and consist of electron-hopping termsand local attractive interactions between electrons. For each even number ofelectrons less than or equal to $1/(d+1)$-filling, we find the exact groundstate in which all electrons form pairs of a certain type, and thus the modelsexhibit an electron-pair condensation.Comment: 4 pages, 1 figur

Exact Electron-Pairing Ground States of Tight-Binding Models with Local Attractive Interactions