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STOCHASTIC

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178 BASIL A. KALYMON<br />

(24) d\ = r - fa = di - fa<br />

and supposing that d, = d, — fa, then<br />

(25)<br />

d ,_i = dj_i(d j, (p — hi) + ij) = d,_i(d> — fa, p — fa + ij)<br />

= dy — h if (dy — fci) — (p — fa + ij) < Sj-i<br />

= p — fa + ij if (d,- - fa) - (p - fa + ij) 6 «;-i<br />

= dj-i — fci.<br />

Thus, (23) holds for all j g i.<br />

By (23), we see that for all j g » — 1<br />

(26) i(d'j - d'y+1) = «(d; - di+i)<br />

and<br />

(27) d'ii = diX — fax.<br />

But<br />

(28) /,_,(r _ ft, | p - ft, + €i) = D5-1 |8/B[«(d'i -

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