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, Since m ? (? i ) ? ?m ? (? j ) = 0, the former expression is positive when (m(? i ) ?

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, Calculation for proof 3, order to prove proposition 3, we must show that m ? (? i )?(m(? i ) ?

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, Remember that ? i > ? j , ? i > ? j and ? i < ? i . Moreover, by definition, ? i ? ? j =

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