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It is shown that the transition from lattice space, where the two-point functions were calculated by means of functional integration, to continuous space Ɛ → 0, which requires in field theories some kind of renormalization, is practicable in quantum mechanics after reordering of series without renormalization. An ambiguity, which occurs, is discussed.

On the Lattice-cell-volume Dependence in the Calculation of the Two-point Function in Quantum Mechanics by the Method of Functional Integration