Abstract For many decades, Kramer’s sampling theorem has been attracting enormous interest in view of its important applications various branches. In this paper we present a new approach to Kramer-type theory based on spectral differential equations higher order an interval the real line. Its novelty relies partly fact that corresponding eigenfunctions are orthogonal with respect scalar product...

Members of the family Bdellidae inhabit a variety of habitats worldwide and are active predators of small arthropods_ Studies by Muma (1975) indicated that Bdella distincta (Baker & Balock) prey on eggs and crawlers of armoured scale insects on citrus in Florida, while Neomolgus capil/atus (Kramer) is associated with pasture pests from Scandinavia to Morocco (Wallace 1974). Bdellodes lapidaria ...

Several intersection matrices of s-subsets versus k-subsets of a v-set are introduced in the literature. We study these matrices systematically through counting arguments and generating function techniques. A number of new or known identities appear as natural consequences of this viewpoint; especially, use of the derivative operator d/dz and some related operators reveals some connections betw...

Water is the most limiting factor for plant growth and crop productivity (Kramer, 1983), and water-deficit stress adversely affects crop growth and yield throughout the world (Boyer, 1982). Crop yields are being reduced by drought and the increasing scarcity of water for irrigation, and changing world climatic trends may increase the severity of the problem (Le Houerou, 1996). Water availabilit...

The capacity region of the N -sender additive white Gaussian noise (AWGN) multiple access channel (MAC) with feedback is not known in general, despite significant contributions by Cover, Leung, Ozarow, Thomas, Pombra, Ordentlich, Kramer, and Gastpar. This paper studies the class of generalized linear feedback codes that includes (nonlinear) nonfeedback codes at one extreme and the linear feedba...