counting measure

From: hagada <dormantwormforever@xxxxxxxxx>
Date: Thu, 26 Jan 2006 12:15:40 EST

Hi

Let A be a set, let n be the counting measure let f:A to Complex, then show that if Int[(abs f)dn] is finite, then the subset of A for which f(a)=/=0 (a in A)is at most countable.

Since n is the counting measure, shouldn't the integral just be a summation?
.

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