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  2. 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 ...

  3. Even–odd rule - Wikipedia

    en.wikipedia.org/wiki/Evenodd_rule

    The SVG defines the evenodd rule by saying: This rule determines the "insideness" of a point on the canvas by drawing a ray from that point to infinity in any direction and counting the number of path segments from the given shape that the ray crosses. If this number is odd, the point is inside; if even, the point is outside.

  4. Parity bit - Wikipedia

    en.wikipedia.org/wiki/Parity_bit

    For a given set of bits, if the count of bits with a value of 1 is even, the parity bit value is set to 1 making the total count of 1s in the whole set (including the parity bit) an odd number. If the count of bits with a value of 1 is odd, the count is already odd so the parity bit's value is 0. Even parity is a special case of a cyclic ...

  5. Parity of a permutation - Wikipedia

    en.wikipedia.org/wiki/Parity_of_a_permutation

    The permutation is odd if and only if this factorization contains an odd number of even-length cycles. Another method for determining whether a given permutation is even or odd is to construct the corresponding permutation matrix and compute its determinant. The value of the determinant is the same as the parity of the permutation. Every ...

  6. Collatz conjecture - Wikipedia

    en.wikipedia.org/wiki/Collatz_conjecture

    The number is taken to be 'odd' or 'even' according to whether its numerator is odd or even. Then the formula for the map is exactly the same as when the domain is the integers: an 'even' such rational is divided by 2; an 'odd' such rational is multiplied by 3 and then 1 is added.

  7. Point in polygon - Wikipedia

    en.wikipedia.org/wiki/Point_in_polygon

    If the point is on the inside of the polygon then it will intersect the edge an odd number of times. The status of a point on the edge of the polygon depends on the details of the ray intersection algorithm. This algorithm is sometimes also known as the crossing number algorithm or the evenodd rule algorithm, and was known as early as 1962. [3]

  8. Chinese postman problem - Wikipedia

    en.wikipedia.org/wiki/Chinese_postman_problem

    An edge set J is called a T-join if the collection of vertices that have an odd number of incident edges in J is exactly the set T. A T-join exists whenever every connected component of the graph contains an even number of vertices in T. The T-join problem is to find a T-join with the minimum possible number of edges or the minimum possible ...

  9. Odd–even sort - Wikipedia

    en.wikipedia.org/wiki/Oddeven_sort

    The oddeven sort algorithm correctly sorts this data in passes. (A pass here is defined to be a full sequence of oddeven, or evenodd comparisons. The passes occur in order pass 1: oddeven, pass 2: evenodd, etc.) Proof: This proof is based loosely on one by Thomas Worsch. [6]