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Abstract
A procedure for calculation of the nonlocal interaction of the helium atom with the positron in a mixed Gibbs state at temperature of several K is suggested and carried out. The integration over the positron variables is made numerically with the aid of PIMC random walk in the space of Feynman trajectories. Calculations indicate that the local approximation used in [2] if applied properly results in a wrong (positive) sign of the He-e+ interaction. The negative nonlocal part exceeds twice the absolute value of the local part thus providing attractive character of the resulting interaction.