High Quality Content by WIKIPEDIA articles! Universal algebra (sometimes called general algebra) is the field of mathematics that studies algebraic structures themselves, not examples ("models") of algebraic structures. For instance, rather than take particular groups as the object of study, in universal algebra one takes "the theory of groups" as an object of study. From the point of view of universal algebra, an algebra (or algebraic structure) is a set A together with a collection of...
High Quality Content by WIKIPEDIA articles! Universal algebra (sometimes called general algebra) is the field of mathematics that studies algebraic structures themselves, not examples ("models") of algebraic structures. For instance, rather than take particular groups as the object of study, in universal algebra one takes "the theory of groups" as an object of study. From the point of view of universal algebra, an algebra (or algebraic structure) is a set A together with a collection of operations on A. An n-ary operation on A is a function that takes n elements of A and returns a single element of A. Thus, a 0-ary operation (or nullary operation) can be represented simply as an element of A, or a constant, often denoted by a letter like a. A 1-ary operation (or unary operation) is simply a function from A to A, often denoted by a symbol placed in front of its argument, like ~x. A 2-ary operation (or binary operation) is often denoted by a symbol placed between its arguments, like x * y.
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Фридрих Львиный Зев - последний отпрыск легендарного рода шмелелетов, и только ему под силу разузнать, что затевается на диком Севере, - так утверждает королева. Вместе с Иеронимом Брумзелем, золотым шмелем, Фридрих отправляется в безумно опасное путешествие. И выясняет, что на Севере на самом-то деле все спокойно. Вот только королева уже запланировала войну, в результате которой она станет великим героем...
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