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In set theory, the union (denoted by ∪) of a collection of sets is the set of all elements in the collection. [1] It is one of the fundamental operations through which sets can be combined and related to each other. A nullary union refers to a union of zero ( ) sets and it is by definition equal to the empty set.
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A disjoint union of a family of pairwise disjoint sets is their union . In category theory, the disjoint union is the coproduct of the category of sets, and thus defined up to a bijection. In this context, the notation is often used. The disjoint union of two sets and is written with infix notation as . Some authors use the alternative notation ...
Card check, also called majority sign-up, is a method for employees to organize into a labor union in which a majority of employees in a bargaining unit sign authorization forms, or "cards", stating they wish to be represented by the union. Since the National Labor Relations Act (NLRA) became law in 1935, card check has been an alternative to ...
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A cluster graph, the disjoint union of complete graphs. In graph theory, a branch of mathematics, the disjoint union of graphs is an operation that combines two or more graphs to form a larger graph. It is analogous to the disjoint union of sets, and is constructed by making the vertex set of the result be the disjoint union of the vertex sets ...
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Find out how to identify and correct common sign-in issues like problems with your username and password, account locks, looping logins, and other account access errors. Account Management · Feb 21, 2024. Get answers to your AOL Mail, login, Desktop Gold, AOL app, password and subscription questions. Find the support options to contact ...