PHYSICS:J. A. N.

Xi(X)=ai(x)-J fi(x)dx, (i=1, 2) (8) a mustbemonotoneincreasing,7 andtheir derivatives will vanishexcepting onE. Ifaki>0is nowgiven, theremustbeasequenceof non-overlapping oo open intervals, Bi=IIncontaining each point of E as an interior n=1 point of someI,, such that the measure of B1 is less than ki. Then the variation of Xi onB1is equal to ... ................
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