Proof. Let ri ¼ 1
Q
p2Bj
ð1 hpÞ 1 ð1 hbÞPi,rj 1(1ha)Pj,
Pmi ri(1 rj)Ri and PmjrbRj.Now, let r0
i and r0
j be the new bin probabilities
with the item a and b exchanged, r0
i ¼ 1 ð1 haÞPi and
r0
j ¼ 1 ð1 hbÞPj. Clearly, r0
i > ri and r0
j < rj. Let P0
mi and P0
mj denote
the one-step transition probability after the exchange; then,
Proof. Let ri ¼ 1 Qp2Bjð1 hpÞ 1 ð1 hbÞPi,rj 1(1ha)Pj,Pmi ri(1 rj)Ri and PmjrbRj.Now, let r0i and r0j be the new bin probabilitieswith the item a and b exchanged, r0i ¼ 1 ð1 haÞPi andr0j ¼ 1 ð1 hbÞPj. Clearly, r0i > ri and r0j < rj. Let P0mi and P0mj denotethe one-step transition probability after the exchange; then,
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