This paper is devoted to the derivation of some regularity properties of pricing functions for American options and to the discussion of numerical methods, based on the Bensoussan-Lions methods of varia-tional inequalities. In particular, we provide a complete justiication of the so-called Brennan-Schwartz algorithm for the valuation of Ameri-can put options.

as an animal that seeks pleasure and avoids pain. In this book Dr. Reik stresses the social type of masochism which tends to dominate not only the life of individuals but also social groups. His studies of the perverseness of the individual and of the behaviour of national groups forces him to the conclusion that, far from being a creature that seeks pleasure and avoids pain, man is indubitably...

A generating function for cabled Wilson loops in three-dimensional BF theories is defined, and a careful study of its behavior for vanishing cosmological constant is performed. This allows an exhaustive description of the unframed knot invariants coming from the pure BF theory based on SU(2), and, in particular, it proves a conjecture relating them to the Alexander-Conway polynomial. 0 1996 Ame...

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THE time seems to be ripe for a study of results, and it is my intention today to give a summary of the results obtained by prostatectomy through the perineal route by the technique previously described by me. (Journal of the Ameri-In these papers the technique of the operation has been so fully detailed that I will not now make a repetition of its

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We have developed a four-language automatic language identification system for high-quality speech. The system uses a neural network-based segmentation algorithm to segment speech into seven broad phonetic categories. Phonetic and prosodic features computed on these categories are then input to a second network that performs the language classification. The system was trained and tested on sepa...

The natural history of Chagasic cardiopathy is still not well-known, mainly because innumerable clinical pictures develop without symptoms, and the cases seen at hospitals are merely the most overtly serious. This circumstance may tend to create a false impression that this cardiopathy is relatively benign, because of the small demand it generates for hospital beds in comparison with other path...