The New Encyclopædia BritannicaEncyclopaedia Britannica, Incorporated, 1987 - Encyclopedias and dictionaries |
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Page 270
... elements and can be conveniently described by diagrams : any graph with sloping lines defines a poset , the Posets elements of which are the nodes of the graph ( the points at which two or more lines meet ) , and in which a > b means ...
... elements and can be conveniently described by diagrams : any graph with sloping lines defines a poset , the Posets elements of which are the nodes of the graph ( the points at which two or more lines meet ) , and in which a > b means ...
Page 276
... elements of a group G that is itself a group under the composition for G is called a subgroup . In many important cases the elements of a group that have certain properties form a subgroup . For example , the one - to - one mappings of ...
... elements of a group G that is itself a group under the composition for G is called a subgroup . In many important cases the elements of a group that have certain properties form a subgroup . For example , the one - to - one mappings of ...
Page 292
... elements of R a well - defined element of R , denoted by x + y ; this addition satisfies the axioms of associativity , commutativity , the existence of a zero element , and the axiom assuring that for every element there is an opposite ...
... elements of R a well - defined element of R , denoted by x + y ; this addition satisfies the axioms of associativity , commutativity , the existence of a zero element , and the axiom assuring that for every element there is an opposite ...
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20th century Abelian group addition adhesives Afghanistan agricultural Albanian alcohol algebra animal associated Bantu Basin British called carved cement central centre ceremonial climate coast colonial common complex numbers Congo contains countries crops cultivation culture dance defined desert developed drinking drug East eastern economic Egypt elements equations European example farm feet field figures finite fish forest functor Ghana important Indians integers irrigation isomorphism Kenya Lake Lake Victoria land lattice Lie algebra linear major mapping masks miles modern mountains Mozambique multiplication Niger Niger River Nigeria Nile northern operations patterns percent period Plains plant Plateau polynomial population rainfall real numbers region ring river Sahara savanna sculpture social society soil South Africa southern subgroup Sudan theory tion trade traditional tribes United Valley vector space vegetation village West Africa western Yoruba Zaire Zimbabwe