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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.
A disjoint union of an indexed family of sets is a set often denoted by with an injection of each into such that the images of these injections form a partition of (that is, each element of belongs to exactly one of these images). A disjoint union of a family of pairwise disjoint sets is their union. In category theory, the disjoint union is ...
Fraternal Order of Police. Independent Pilots Association. Industrial Workers of the World. International Longshore and Warehouse Union. International Union of Journeymen and Allied Trades. Home Healthcare Workers of America. National Organization of Industrial Trade Unions. United Public Service Employees Union.
African Union (AU) is a continental union consisting of all fifty-four internationally recognized African nations plus the disputed Sahrawi Arab Democratic Republic; See also the African Economic Community (AEC) Arab League: a regional organization of Arab countries
The California School Employees Association (CSEA) is the largest classified school employees labor union in the United States. CSEA represents a quarter million classified public school employees in California. CSEA was formed in 1927 by a determined group of Oakland custodians who saw the need to gain protections for themselves and other ...
The International Alliance of Theatrical Stage Employees, Moving Picture Technicians, Artists and Allied Crafts of the United States, Its Territories and Canada, known as simply the International Alliance of Theatrical Stage Employees (IATSE / aɪ ˈ ɑː t s i / [2] or IA [3] for short), is a North American labor union representing over 168,000 technicians, artisans, and craftspersons in the ...
The US Bureau of Labor Statistics most recent survey indicates that union membership in the US has risen to 12.4% of all workers, from 12.1% in 2007. For a short period, private sector union membership rebounded, increasing from 7.5% in 2007 to 7.6% in 2008. [1] However, that trend has since reversed.
Political union, a type of state which is composed of or created out of smaller states. Personal union, the combination of two or more states that have the same monarch. Poor law union, a former unit of local government in the United Kingdom. Real union, a union of two or more states, which share some state institutions.