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  2. Catalan number - Wikipedia

    en.wikipedia.org/wiki/Catalan_number

    The Catalan numbers can be interpreted as a special case of the Bertrand's ballot theorem. Specifically, is the number of ways for a candidate A with n+1 votes to lead candidate B with n votes. The two-parameter sequence of non-negative integers is a generalization of the Catalan numbers.

  3. Partition function (number theory) - Wikipedia

    en.wikipedia.org/wiki/Partition_function_(number...

    In number theory, the partition function p(n) represents the number of possible partitions of a non-negative integer n. For instance, p(4) = 5 because the integer 4 has the five partitions 1 + 1 + 1 + 1, 1 + 1 + 2, 1 + 3, 2 + 2, and 4 . No closed-form expression for the partition function is known, but it has both asymptotic expansions that ...

  4. Number theory - Wikipedia

    en.wikipedia.org/wiki/Number_theory

    t. e. Number theory (or arithmetic or higher arithmetic in older usage) is a branch of pure mathematics devoted primarily to the study of the integers and arithmetic functions. German mathematician Carl Friedrich Gauss (1777–1855) said, "Mathematics is the queen of the sciences—and number theory is the queen of mathematics." [1]

  5. Bicomplex number - Wikipedia

    en.wikipedia.org/wiki/Bicomplex_number

    Bicomplex number. In abstract algebra, a bicomplex number is a pair (w, z) of complex numbers constructed by the Cayley–Dickson process that defines the bicomplex conjugate , and the product of two bicomplex numbers as. Then the bicomplex norm is given by. a quadratic form in the first component.

  6. Colossally abundant number - Wikipedia

    en.wikipedia.org/wiki/Colossally_abundant_number

    In number theory, a colossally abundant number (sometimes abbreviated as CA) is a natural number that, in a particular, rigorous sense, has many divisors. Particularly, it is defined by a ratio between the sum of an integer's divisors and that integer raised to a power higher than one. For any such exponent, whichever integer has the highest ...

  7. PDF/X - Wikipedia

    en.wikipedia.org/wiki/PDF/X

    PDF/X. PDF/X is a subset of the ISO standard for PDF. The purpose of PDF/X is to facilitate graphics exchange, and it therefore has a series of printing-related requirements which do not apply to standard PDF files. For example, in PDF/X-1a all fonts need to be embedded and all images need to be CMYK or spot colors.

  8. 1 − 2 + 3 − 4 + ⋯ - Wikipedia

    en.wikipedia.org/wiki/1_%E2%88%92_2_%2B_3_%E2%88...

    The idea becomes clearer by considering the general series 1 − 2x + 3x 2 − 4x 3 + 5x 4 − 6x 5 + &c. that arises while expanding the expression 1 ⁄ (1+x) 2, which this series is indeed equal to after we set x = 1.

  9. Mortgage rates top 7% — again [Video] - AOL

    www.aol.com/finance/mortgage-rates-top-7-again...

    Some of the trends that we are seeing there, The average 30-year fixed mortgage rate climbed past 7% this week, hitting 7.03% from 6.94% a week prior, according to Freddie Mac. Rates have mostly ...