Conditional expectation in an operator algebra. (English) Zbl 0058.10503

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[1] J. L. DOOB, Stochastic processes, New York, 1954.
[2] SHUH-TEH C. MOY, Characterizations of conditional expectation as a trans formation on function spaces, Pacific Journ. of Math., vol 4(1954), 47-65. · Zbl 0055.12503
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