We give a short proof of the following theorem of Mooney: If {Φn} is a sequence in L1(−π,π) such that limn ∫ fΦn = l(f) exists for all f ∈ H∞, then there is Φ ∈ L1 such that l(f) = ∫ fΦ for all f ∈ H∞.
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