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  2. Inclusion–exclusion principle - Wikipedia

    en.wikipedia.org/wiki/Inclusionexclusion...

    The name comes from the idea that the principle is based on over-generous inclusion, followed by compensating exclusion. This concept is attributed to Abraham de Moivre (1718), [ 1 ] although it first appears in a paper of Daniel da Silva (1854) [ 2 ] and later in a paper by J. J. Sylvester (1883). [ 3 ]

  3. Combinatorial principles - Wikipedia

    en.wikipedia.org/wiki/Combinatorial_principles

    The inclusionexclusion principle relates the size of the union of multiple sets, the size of each set, and the size of each possible intersection of the sets. The smallest example is when there are two sets: the number of elements in the union of A and B is equal to the sum of the number of elements in A and B , minus the number of elements ...

  4. Derangement - Wikipedia

    en.wikipedia.org/wiki/Derangement

    In the general case, for a word with n 1 letters X 1, n 2 letters X 2, ..., n r letters X r, it turns out (after a proper use of the inclusion-exclusion formula) that the answer has the form () , for a certain sequence of polynomials P n, where P n has degree n.

  5. Union (set theory) - Wikipedia

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

    Inclusionexclusion principle – Counting technique in combinatorics; Intersection (set theory) – Set of elements common to all of some sets; Iterated binary operation – Repeated application of an operation to a sequence; List of set identities and relations – Equalities for combinations of sets; Naive set theory – Informal set theories

  6. What is affirmative action? Policy explained in simple terms

    www.aol.com/news/affirmative-action-policy...

    Policy explained in simple terms. Randi Richardson. June 29, 2023 at 3:42 PM. ... She says affirmative action is intended to reverse historical exclusion and promote diversity and inclusion.

  7. Probability axioms - Wikipedia

    en.wikipedia.org/wiki/Probability_axioms

    The standard probability axioms are the foundations of probability theory introduced by Russian mathematician Andrey Kolmogorov in 1933. [1] These axioms remain central and have direct contributions to mathematics, the physical sciences, and real-world probability cases.

  8. What is an 'inclusion rider'? Frances McDormand's Oscars ...

    www.aol.com/entertainment/apos-inclusion-rider...

    McDormand ended her speech with two words: Inclusion rider. People on Twitter scrambled to find an answer, with some even speculating she might have meant "inclusion writer" or "inclusion, write her."

  9. Stirling numbers of the second kind - Wikipedia

    en.wikipedia.org/wiki/Stirling_numbers_of_the...

    This can be derived by using inclusion-exclusion to count the surjections from n to k and using the fact that the number of such surjections is ! {}. Additionally, this formula is a special case of the k th forward difference of the monomial x n {\displaystyle x^{n}} evaluated at x = 0: