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SdUdPhWhUS/ μi is Wkh iqgiyigxaO hffhfW, λt is Wkh Wiph hffhfW, aqg vit is Wkh huuru Whum. Zh
aOOrz fi{hg hffhfWs ru uaqgrp hffhfWs. WkurxjkrxW, zh assxph Ti ` ciT iru some iqWhjhu T
aqg ci 5 df>FO = Wkxs, zh ShumiW xqeaOaqfhg saqhO gaWa. Pruhryhu, zh aOOrz Yit>Xit>aQ aqg
β0 Wr ghshqg rq erWk q aqg T= (Iru qrWaWirqaO simsOifiW∣, zh sxssuhss sxfk ghshqghqfh.)
WkurxjkrxW, zh assxmh Wkh irOOrziqj frqgiWirqs rq (2.1)=
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fryauiaqfh0sWaWirqau∣ ziWk H ( Vi t) ‘ f > H ( vfs) ‘ σi 5 d f> F O aqg H ( viɔ 5 d f> F ]; (ii) Wkhuh is
qr ssaWiaO ghshqghqfh iq {vi j, i.h., yit aqg Vj8 auh iqghShqghqW iru aOO l ' j aqg aOO W> v( (iii)
Wkh iqgiyigxaO aqg Wimh hffhfWs, μi aqg λt> faq eh sWrfkasWif (uaqgrm hffhfWs) ru ghWhumiqisWif
({hg hhfWs).
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