relation embedding
81Combinatorial species — In combinatorial mathematics, the theory of combinatorial species is an abstract, systematic method for analysing discrete structures in terms of generating functions. Examples of discrete structures are (finite) graphs, permutations, trees, and… …
82Turing degree — Post s problem redirects here. For the other Post s problem , see Post s correspondence problem. In computer science and mathematical logic the Turing degree or degree of unsolvability of a set of natural numbers measures the level of algorithmic …
83Substructure — In universal algebra, an (induced) substructure or (induced) subalgebra is a structure whose domain is a subset of that of a bigger structure, and whose functions and relations are the traces of the functions and relations of the bigger structure …
84Gödel numbering for sequences — A Gödel numbering for sequences provides us an effective way to represent each finite sequence of natural numbers as a single natural number. Of course, the embedding is surely possible set theoretically, but the emphasis is on the effectiveness… …
85Théorie des graphes — Pour la notion mathématique utilisée en Théorie des ensembles, voir Graphe d une fonction. La théorie des graphes est une théorie informatique et mathématique. Les algorithmes élaborés pour résoudre des problèmes concernant les objets de cette… …
86India — /in dee euh/, n. 1. Hindi, Bharat. a republic in S Asia: a union comprising 25 states and 7 union territories; formerly a British colony; gained independence Aug. 15, 1947; became a republic within the Commonwealth of Nations Jan. 26, 1950.… …
87Tetrahedron — For the academic journal, see Tetrahedron (journal). Regular Tetrahedron (Click here for rotating model) Type Platonic solid Elements F = 4, E = 6 V = 4 (χ = 2) Faces by s …
88Adjoint functors — Adjunction redirects here. For the construction in field theory, see Adjunction (field theory). For the construction in topology, see Adjunction space. In mathematics, adjoint functors are pairs of functors which stand in a particular… …
89John Forbes Nash, Jr. — Infobox Scientist name = John Forbes Nash, Jr. image size = 180px caption = John Nash at a symposium of game theory at the University of Cologne, Germany (2006) birth date = birth date and age|mf=yes|1928|6|13 birth place = Bluefield, West… …
90Zero sharp — In the mathematical discipline of set theory, 0# (zero sharp, also 0#) is defined to be a particular real number satisfying certain conditions, namely, to be the real number that codes in the canonical way the Gödel numbers of the true formulas… …
