ferentials

A differential σ on a figure K is abso lu te ly in teg rab le over K if both σ and |σ| are integrable over K. σ is conditionally in teg rab le if σ is integrable but |σ| is not integrable.

T heorem 1. (i) σ is absolutely integrable if and only if both σ + and σ~ are integrable.