In algebra, a branch of pure mathematics, an algebraic structure consists of one or more sets closed under one or more operations, satisfying some axioms. Abstract algebra is primarily the study of algebraic structures and their properties. The notion of algebraic structure has been formalized in universal algebra. As an abstraction, an "algebraic structure" is the collection of all possible models of a given set of axioms. More concretely, an algebraic structure is any particular model of some...
In algebra, a branch of pure mathematics, an algebraic structure consists of one or more sets closed under one or more operations, satisfying some axioms. Abstract algebra is primarily the study of algebraic structures and their properties. The notion of algebraic structure has been formalized in universal algebra. As an abstraction, an "algebraic structure" is the collection of all possible models of a given set of axioms. More concretely, an algebraic structure is any particular model of some set of axioms. For example, the monster group both "is" an algebraic structure in the concrete sense, and abstractly, "has" the group structure in common with all other groups. This article employs both meanings of "structure."
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Недалеко от Оксфорда, на берегу Темзы, живет простой одиннадцатилетний мальчишка по имени Малкольм Полстед. Он помогает родителям, которые содержат трактир, обитательницам женского монастыря на другом берегу реки, и очень хочет учиться в настоящей школе. Однажды Малкольм узнает, что в монастыре появился необычный гость. Это маленькая девочка. Ее зовут Лира Белаква...
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