reducible class
71Category of being — In metaphysics (in particular, ontology), the different kinds or ways of being are called categories of being or simply categories. To investigate the categories of being is to determine the most fundamental and the broadest classes of entities.… …
72Lambda calculus — In mathematical logic and computer science, lambda calculus, also written as λ calculus, is a formal system designed to investigate function definition, function application and recursion. It was introduced by Alonzo Church and Stephen Cole… …
73Emmy Noether — Amalie Emmy Noether Born 23 March 1882(1882 03 23) …
74Automatic Train Protection — (ATP) in Great Britain refers to either of two implementations of a train protection system installed in some trains in order to help prevent collisions through a driver s failure to observe a signal or speed restriction. Note that ATP can also… …
75Wadge hierarchy — In descriptive set theory, Wadge degrees are levels of complexity for sets of reals and more comprehensively, subsets of any given topological space. Sets are compared by continuous reductions. The Wadge hierarchy is the structure of Wadge… …
76Commodity (Marxism) — Part of a series on Marxism …
77Subdirect irreducible — In algebra, a subdirect irreducible is an algebra that cannot be factored as a subdirect product of simpler algebras. Subdirect irreducibles play a somewhat analogous role in algebra to primes in number theory. TOC =Definition=In algebra, a… …
78Symmetric Turing machine — Definition of symmetric Turing machines: SL was first defined in 1982 by Lewis and Papadimitriou, [Jesper Jansson. [http://www.df.lth.se/ jj/Publications/STCON2.ps Deterministic Space Bounded Graph Connectivity Algorithms] . Manuscript. 1998.]… …
79NP-complete problem — ▪ computer science any of a class of computational problems for which no efficient solution algorithm has been found. Many significant computer science problems belong to this class e.g., the traveling salesman problem, satisfiability… …
80surface coating — ▪ chemistry Introduction any mixture of film forming materials plus pigments, solvents, and other additives, which, when applied to a surface and cured or dried, yields a thin film that is functional and often decorative. Surface coatings… …
