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  2. Even and odd ordinals - Wikipedia

    en.wikipedia.org/wiki/Even_and_odd_ordinals

    The successor of an even ordinal is odd, and vice versa. [1] [2] Let α = λ + n, where λ is a limit ordinal and n is a natural number. The parity of α is the parity of n. [3] Let n be the finite term of the Cantor normal form of α. The parity of α is the parity of n. [4] Let α = ωβ + n, where n is a natural number.

  3. Parity (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Parity_(mathematics)

    Even and odd numbers have opposite parities, e.g., 22 (even number) and 13 (odd number) have opposite parities. In particular, the parity of zero is even. [2] Any two consecutive integers have opposite parity. A number (i.e., integer) expressed in the decimal numeral system is even or odd according to whether its last digit is even or odd. That ...

  4. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    Such a number is algebraic and can be expressed as the sum of a rational number and the square root of a rational number. Constructible number: A number representing a length that can be constructed using a compass and straightedge. Constructible numbers form a subfield of the field of algebraic numbers, and include the quadratic surds.

  5. Parity of a permutation - Wikipedia

    en.wikipedia.org/wiki/Parity_of_a_permutation

    The numbers in the right column are the inversion numbers (sequence A034968 in the OEIS), which have the same parity as the permutation. In mathematics, when X is a finite set with at least two elements, the permutations of X (i.e. the bijective functions from X to X) fall into two classes of equal size: the even permutations and the odd ...

  6. Even and odd functions - Wikipedia

    en.wikipedia.org/wiki/Even_and_odd_functions

    The integral of an odd function from −A to +A is zero (where A can be finite or infinite, and the function has no vertical asymptotes between −A and A). For an odd function that is integrable over a symmetric interval, e.g. [,], the result of the integral over that interval is zero; that is [2]

  7. Table of prime factors - Wikipedia

    en.wikipedia.org/wiki/Table_of_prime_factors

    A number where some but not all prime factors have multiplicity above 1 is neither square-free nor squareful. The Liouville function λ(n) is 1 if Ω(n) is even, and is -1 if Ω(n) is odd. The Möbius function μ(n) is 0 if n is not square-free. Otherwise μ(n) is 1 if Ω(n) is even, and is −1 if Ω(n) is odd.

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