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  2. Nitrogen rule - Wikipedia

    en.wikipedia.org/wiki/Nitrogen_rule

    The nitrogen rule states that organic compounds containing exclusively hydrogen, carbon, nitrogen, oxygen, silicon, phosphorus, sulfur, and the halogens either have (1) an odd nominal mass that indicates an odd number of nitrogen atoms are present or (2) an even nominal mass that indicates an even number of nitrogen atoms in the molecular formula of the neutral compound.

  3. Oddo–Harkins rule - Wikipedia

    en.wikipedia.org/wiki/Oddo–Harkins_rule

    The Oddo–Harkins rule may suggest that elements with odd atomic numbers have a single, unpaired proton and may swiftly capture another in order to achieve an even atomic number and proton parity. Protons are paired in elements with even atomic numbers, with each member of the pair balancing the spin of the other, thus enhancing nucleon stability.

  4. Even and odd functions - Wikipedia

    en.wikipedia.org/wiki/Even_and_odd_functions

    They are named for the parity of the powers of the power functions which satisfy each condition: the function () = is even if n is an even integer, and it is odd if n is an odd integer. Even functions are those real functions whose graph is self-symmetric with respect to the y -axis, and odd functions are those whose graph is self-symmetric ...

  5. Badminton - Wikipedia

    en.wikipedia.org/wiki/Badminton

    The Badminton World Federation (BWF) is the internationally recognized governing body of the sport responsible for the regulation of tournaments and approaching fair play. Five regional confederations are associated with the BWF, the rest are unaffiliated, or are minor in comparison.

  6. Round-robin tournament - Wikipedia

    en.wikipedia.org/wiki/Round-robin_tournament

    Then the first column is updated: if the number of competitors is even, player number is alternatingly substituted for the first and second positions, whereas if the number of competitors is odd a bye is used instead. The pairing tables were published as an annex concerning the arrangements for the holding of master tournaments.

  7. 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 ...

  8. Bye (sports) - Wikipedia

    en.wikipedia.org/wiki/Bye_(sports)

    The Australian Football League, which comprises an even number of clubs, gives each club a bye week in mid-season [a], as well as a bye the week before the finals. In 1915, 1919 to 1924, 1942 and 1943, 1991 to 1994 and 2011, when there were an odd number of clubs competing, each club was given two byes.

  9. Bracket (tournament) - Wikipedia

    en.wikipedia.org/wiki/Bracket_(tournament)

    Assuming an even number of pools (e.g., pool A, B, C, and D), each of the #1 ranked team based upon their pool play results play an initial game (A1 vs B1, C1 vs D1). Winners go to the championship. Losers play for 3rd and 4th place. Assuming an odd pools number of pools (e.g., pool A, B, and C), Seed 1 from Pool A (A1) plays seed 1 from Pool B ...