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  2. XY sex-determination system - Wikipedia

    en.wikipedia.org/wiki/XY_sex-determination_system

    Offspring have two sex chromosomes: an offspring with two X chromosomes (XX) will develop female characteristics, and an offspring with an X and a Y chromosome (XY) will develop male characteristics, except in various exceptions such as individuals with Swyer syndrome, that have XY chromosomes and a female phenotype, and de la Chapelle Syndrome ...

  3. Method of complements - Wikipedia

    en.wikipedia.org/wiki/Method_of_complements

    To subtract a decimal number y (the subtrahend) from another number x (the minuend) two methods may be used: In the first method, the nines' complement of x is added to y. Then the nines' complement of the result obtained is formed to produce the desired result. In the second method, the nines' complement of y is added to x and one is added to ...

  4. XY problem - Wikipedia

    en.wikipedia.org/wiki/XY_problem

    Asking about how to change Nmap output (X) rather than how to prevent untrusted remote machines from detecting the operating system (Y) [5] Asking about how to get a string between two delimiters (X) rather than how to parse JSON (Y) [1] Asking how to construct a regular expression to extract values from XML (X) [6] instead of how to parse XML (Y).

  5. NP-completeness - Wikipedia

    en.wikipedia.org/wiki/NP-completeness

    When the answer is "yes", this can be demonstrated through the existence of a short (polynomial length) solution. The correctness of each solution can be verified quickly (namely, in polynomial time) and a brute-force search algorithm can find a solution by trying all possible solutions.

  6. 6 - Wikipedia

    en.wikipedia.org/wiki/6

    6 as a resin identification code, used in recycling. On most phones, the 6 key is associated with the letters M, N, and O, but on the BlackBerry Pearl it is the key for J and K, and on the BlackBerry 8700 series and Curve 8900 with full keyboard, it is the key for F; The "6-meter band" in amateur radio includes the frequencies from 50 to 54 MHz

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  8. Elliptic-curve Diffie–Hellman - Wikipedia

    en.wikipedia.org/wiki/Elliptic-curve_Diffie...

    [1] [2] [3] This shared secret may be directly used as a key, or to derive another key. The key, or the derived key, can then be used to encrypt subsequent communications using a symmetric-key cipher. It is a variant of the Diffie–Hellman protocol using elliptic-curve cryptography.

  9. Division (mathematics) - Wikipedia

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

    In abstract algebra, given a magma with binary operation ∗ (which could nominally be termed multiplication), left division of b by a (written a \ b) is typically defined as the solution x to the equation a ∗ x = b, if this exists and is unique. Similarly, right division of b by a (written b / a) is the solution y to the equation y ∗ a = b ...