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[en] The ground state of 2-D Heisenberg antiferromagnetic s = 1/2 system with N = 8 and N = 10 spins and periodical boundary conditions is analytically found. Formulae for the transfer between two representation of the wave functions - as a linear combination of Ising configurations and a linear combination of singlet functions - are obtained. The closeness of two well known in the literature trial functions for the ground state of the 2-D antiferromagnet is estimated by these formulae
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Aksenov, V.L.; Bogolubov, N.M.; Plakida, N.M; 610 p; ISBN 981-02-003-X; 
; 1990; p. 464-470; World Scientific Pub. Co; Teaneck, NJ (United States); International seminar on high temperature superconductivity; Dubna (USSR); 28 Jun - 1 Jul 1989; CONF-890681--; World Scientific Pub. Co., 687 Hartwell Street, Teaneck, NJ 07666 (USA)
; 1990; p. 464-470; World Scientific Pub. Co; Teaneck, NJ (United States); International seminar on high temperature superconductivity; Dubna (USSR); 28 Jun - 1 Jul 1989; CONF-890681--; World Scientific Pub. Co., 687 Hartwell Street, Teaneck, NJ 07666 (USA)