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Results are obtained on resolvent expansions around zero energy for Schrödinger operators H = −∆ + V (x) on L2(Rm), where V (x) is a sufficiently rapidly decaying real potential. The emphasis is on a unified approach, valid in all dimensions, which does not require one to distinguish between ∫ V (x)dx = 0 and ∫ V (x)dx 6= 0 in dimensions m = 1, 2. It is based on a factorization technique and repeated decomposition of the Lippmann-Schwinger operator. Complete results are given in dimensions m = 1 and m = 2.

ERRATUM: A UNIFIED APPROACH TO RESOLVENT EXPANSIONS AT THRESHOLDS