Variation of a complex charge

Fermat

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Let (X,R) be a measure space. $$\displaystyle v=u_{1}+iu_{2}$$ be a complex charge. Find the variation of v when $$\displaystyle u_{1}, u_{2}$$ are positive disjunctive charges.

Does disjunctive charges mean that there is a partition A, B of X such that $$\displaystyle u_{1}(A)= u_{2}(B)=0$$?