In the light of the Sturm-Liouville theorem, the Levinson theorem for the Schrödinger equation with both local and non-local cylindrically symmetric potentials is studied. It is proved that the two-dimensional Levinson theorem holds for the case with both local and non-local cylindrically symmetric cutoff potentials, which is not necessarily separable. In addition, the problems related to the p...

A separated sequence Λ on the real line is called a Polya sequence if any entire function of zero exponential type bounded on Λ is constant. In this paper we solve the problem by Polya and Levinson that asks for a description of Polya sets. We also show that the Polya-Levinson problem is equivalent to a version of the so-called Beurling gap problem on Fourier transforms of measures. The solutio...

Tripartite systems are currently common to several theories concerned with distinguishing different spatial frames of reference (Levinson, 1996, 2003; Levelt, 1996; Tversky, 1996). The notion that such a 3-part spatial model (e.g. intrinsic, deictic, extrinsic) can be extended to temporal models is at least theoretically plausible (Levinson, 2003). The current study reviews three basic spatial ...

Nezaketin bir dilbilim kavramı olarak ele alınması ile beraber Grice’la başlayan strateji geliştirme ve ilkeler öne sürme geleneği zamanla farklı araştırmacıların elinde kuramsal yaklaşıma dönüşmüştür. Lakoff (1975), Leech (1983) gibi isimlerle devam eden süreç olgun hâllerinden birine Brown Levinson (1987) ulaşmıştır. Goffman’ın yüz (face) yaklaşımını benimseyen için nezaket, toplumu oluşturan...

We give a recursive algorithm for the computation of the first and second order derivatives of the entropy of a periodic autoregressive process with respect to the autocovariances. It is an extentions of the periodic Levinson-Durbin algorithm. The algorithm has been developed for use at one of the steps of an entropy maximisation method developed by the authors. We give numerical examples of en...

can be found at: Public Finance Review Additional services and information for http://pfr.sagepub.com/cgi/alerts Email Alerts: http://pfr.sagepub.com/subscriptions Subscriptions: http://www.sagepub.com/journalsReprints.nav Reprints: http://www.sagepub.com/journalsPermissions.nav Permissions: http://pfr.sagepub.com/cgi/content/refs/35/4/545 SAGE Journals Online and HighWire Press platforms): (...

Inserido na perspectiva da Pragmática Cross-cultural, este artigo investiga o ato de fala do pedido, colocando em primeiro plano a avaliação contexto, por parte falantes português brasileiro e italiano, com base nos seguintes parâmetros: distância social, direito realizar sua dificuldade probabilidade imaginada pelo falante que ouvinte aceitaria é solicitado. Para esse fim, ao Written Discourse...