Mathematical encyclopedia of the classes of integers (Q2848095)

The set of natural numbers (also known as counting numbers) is the oldest and most elementary number system. These numbers, along history, were classified in many ways, and the author tries to present the most important classes of natural numbers.NEWLINENEWLINEThe book is divided in two parts: Classes of numbers and Classes of primes and pseudoprimes, containing the principal classes of numbers that are used today in number theory, respectively, some relevant types of primes or pseudoprimes.NEWLINENEWLINEThe author tries to use simple notions and elementary operations in order to make everyone (not only an expert) understand any definition or property of a class of numbers described here. In this sense, every category of numbers is presented by a definition, with examples and some properties or commentaries regarding the connections with others classes of numbers.NEWLINENEWLINEThe book is written in Romanian, but in the end an English-Romanian dictionary of usual terms is given, Even notions that are not used here (because there are classes of numbers which were, for different reasons, not presented here).NEWLINENEWLINEThe book ends with an index of ``mathematicians'' who studied or study different classes of natural numbers. Some of them are (or were), for example, chemists, physicists, lawyers or editors, but their contributions in number theory are very important.