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  2. Union (set theory) - Wikipedia

    en.wikipedia.org/wiki/Union_(set_theory)

    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.

  3. Disjoint union - Wikipedia

    en.wikipedia.org/wiki/Disjoint_union

    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 ...

  4. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  5. Plus and minus signs - Wikipedia

    en.wikipedia.org/wiki/Plus_and_minus_signs

    The plus sign ( +) and the minus sign ( −) are mathematical symbols used to denote positive and negative functions, respectively. In addition, + represents the operation of addition, which results in a sum, while − represents subtraction, resulting in a difference. [1] Their use has been extended to many other meanings, more or less analogous.

  6. Card check - Wikipedia

    en.wikipedia.org/wiki/Card_check

    Card check. 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 ...

  7. Best Gastroenterologists Near Me in Union, NJ | WebMD

    doctor.webmd.com/.../new-jersey/union

    Dr. Pavan Kumar Sachan, MD. Gastroenterology. 16. 31 Years Experience. 695 Chestnut St Ste 2, Union, NJ 07083 0.44 miles. Dr. Sachan graduated from the Sarojini Naidu Medical College in 1993. He works in Rahway, NJ and 8 other locations and specializes in Gastroenterology. Dr. Sachan is affiliated with.

  8. A+ Oral Surgery Specialty Care in Allentown, PA - WebMD

    doctor.webmd.com/practice/a-oral-surgery...

    PRIMARY LOCATION. A+ Oral Surgery Specialty Care. 1901 Union Bouldevard. Allentown, PA 18109. Tel: (610) 437-5353. Physicians at this location.

  9. Mathematical operators and symbols in Unicode - Wikipedia

    en.wikipedia.org/wiki/Mathematical_operators_and...

    Mathematical operators and symbols are in multiple Unicode blocks. Some of these blocks are dedicated to, or primarily contain, mathematical characters while others are a mix of mathematical and non-mathematical characters. This article covers all Unicode characters with a derived property of "Math". [2] [3]