All of the results in Chapters 2 and 4 were probably read with an implicit assumption that the random variables X and Y were one- dimensional. However, there is no explicit necessity that such be the case. Xcan be l1 dimensional and better denoted by with X possible values xɛS(JQ and Y £2 dimensional, better denoted by Y, with possible values yɛS(Y). All the material in Chapters 2 and 4 remains correct with all X’s, Y’s, x’s and y’s underlined and interpreted as appropriate vectors
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