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Line 53: Two random variables ''X'' and ''Y'' are ''equal in p-th mean'' if the ''p''th moment of \|''X''-''Y''\| is zero, that is, :<math>E~~\bigl~~[\|X-Y\|^p~~\bigr~~]=0.</math> Equality in ''p''th mean implies equality in ''q''th mean for all ''q''<''p''.

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