Itô

Poisson Point Processes and Their Application to Markov Processes

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eBook. PDF

eBook

2015

43 S. XI, 43 p. 3 illus..

In englischer Sprache

Springer Nature Singapore. ISBN 9789811002724

Produktbeschreibung

An extension problem (often called a boundary problem) of Markov processes has been studied, particularly in the case of one-dimensional diffusion processes, by W. Feller, K. Itô, and H. P. McKean, among others. In this book, Itô discussed a case of a general Markov process with state space S and a specified point a ¿ S called a boundary. The problem is to obtain all possible recurrent extensions of a given minimal process (i.e., the process on S \ {a} which is absorbed on reaching the boundary a). The study in this lecture is restricted to a simpler case of the boundary a being a discontinuous entrance point, leaving a more general case of a continuous entrance point to future works. He established a one-to-one correspondence between a recurrent extension and a pair of a positive measure k(db) on S \ {a} (called the jumping-in measure and a non-negative number m< (called="" the="" stagnancy="" rate).="" the="" necessary="" and="" sufficient="" conditions="" for="" a="" pair="" k,="" m="" was="" obtained="" so="" that="" the="" correspondence="" is="" precisely="" described.="" for="" this,="" itô="" used,=""  as="" a="" fundamental="" tool,="" the="" notion="" of="" poisson="" point="" processes="" formed="" of="" all="" excursions="" of=""  the="" process="" on s \ {a}.="" this="" theory="" of="" itô's="" of="" poisson="" point="" processes="" of="" excursions="" is="" indeed="" a="" breakthrough.="" it="" has="" been="" expanded="" and="" applied="" to="" more="" general="" extension="" problems="" by="" many="" succeeding="" researchers.="" thus="" we="" may="" say="" that="" this="" lecture="" note="" by="" itô="" is="" really="" a="" memorial="" work="" in="" the="" extension="" problems="" of="" markov="" processes.="" especially="" in="" chapter="" 1="" of="" this="" note,="" a="" general="" theory="" of="" poisson="" point="" processes="" is="" given="" that="" reminds="" us="" of="" itô's="" beautiful="" and="" impressive="" lectures="" in="" his="">

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