My question relates to Problem 3E-2 (b) in the integration problem set. I understand the 2nd part of the question (why lim as x approached -inf of E(x) is - lim as it approached +inf) but why then isn't the answer to the first part 0 (isn't it essentially asking for the sum of the +inf and neg inf limits of E(x)?

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Thanks, I wrote out the problem more carefully (a lesson) and it was obvious.

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