" Memory is made up of a number of interrelated systems, organized structures of operating components consisting of neural substrates and their behavioral and cognitive correlates. A ternary classificatory scheme of memory is proposed in which procedural, semantic, and episodic memory constitute a "monohierarchical" arrangement: Episodic memory is a specialized subsystem of semantic memory, and...

A set of m positive integers is called a Diophantine m-tuple if the product of its any two distinct elements increased by 1 is a perfect square. Diophantus found a set of four positive rationals with the above property. The first Diophantine quadruple was found by Fermat (the set {1, 3, 8, 120}). Baker and Davenport proved that this particular quadruple cannot be extended to a Diophantine quint...

This paper proves the existence of infinitely many Perrin pseudoprimes, as conjectured by Adams and Shanks in 1982. The theorem proven covers a general class of pseudoprimes based on recurrence sequences. The result uses ingredients of the proof of the infinitude of Carmichael numbers, along with zero-density estimates for Hecke L-functions.

As of 2000, more than 39% of same-sex couples in the United States aged 22-55 reported to the Census that they are raising children. They are raising more than 250,000 children under age 18. And that is just the small fraction counted by the census (which left out all children living with a single lesbian or gay parent, everybody with a bisexual or transgender parent, and the probably huge numb...

Since the time of Laud Humphreys’ Tearoom Trade and his investigation of “covert deviants,” homosexuality has achieved both public and scientific visibility. Once considered by scientists to be a legal, moral, and mental abnormality, homosexuality is currently perceived by many scholars and youth as merely statistically deviant. This is not to deny that some portion of the US population still b...

This article surveys current answers to the factual question posed in the title and reviews the kinds of information that are needed to make these answers more precise. Various factors affecting diversity are also reviewed. These include the structure of food webs, the relative abundance of species, the number of species and of individuals in different categories of body size, along with other ...

in the exposition of man's reality and the interpretation of mutual relation of soul and body, today's human beings are no less astonishment than those in the age of plato. in the present age, although there has been provided the background of scientific research, the materialistic tendencies are found more than before. the main reasons of such a thing are the inadequacy of philosophi...