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  2. Kirkman's schoolgirl problem - Wikipedia

    en.wikipedia.org/wiki/Kirkman's_schoolgirl_problem

    In addition to S(2,3,9), Kramer and Mesner examined other systems that could be derived from S(5,6,12) and found that there could be up to 2 disjoint S(5,6,12) systems, up to 2 disjoint S(4,5,11) systems, and up to 5 disjoint S(3,4,10) systems. All such sets of 2 or 5 are respectively isomorphic to each other.

  3. Superparticular ratio - Wikipedia

    en.wikipedia.org/wiki/Superparticular_ratio

    A superparticular number is when a great number contains a lesser number, to which it is compared, and at the same time one part of it. For example, when 3 and 2 are compared, they contain 2, plus the 3 has another 1, which is half of two. When 3 and 4 are compared, they each contain a 3, and the 4 has another 1, which is a third part of 3.

  4. Imperiex - Wikipedia

    en.wikipedia.org/wiki/Imperiex

    The embodiment of entropy, Imperiex takes the form of pure energy contained in armor. [3] Since the beginning of the universe, he has repeatedly destroyed it to create a new one from the remains of the old. In the present, Imperiex and his probes attempt to destroy Earth, which serves as a keystone for the universe.

  5. Universal instantiation - Wikipedia

    en.wikipedia.org/wiki/Universal_instantiation

    In predicate logic, universal instantiation [1] [2] [3] (UI; also called universal specification or universal elimination, [citation needed] and sometimes confused with dictum de omni) [citation needed] is a valid rule of inference from a truth about each member of a class of individuals to the truth about a particular individual of that class.

  6. Universal enveloping algebra - Wikipedia

    en.wikipedia.org/wiki/Universal_enveloping_algebra

    In mathematics, the universal enveloping algebra of a Lie algebra is the unital associative algebra whose representations correspond precisely to the representations of that Lie algebra. Universal enveloping algebras are used in the representation theory of Lie groups and Lie algebras.

  7. Universal Combat - Wikipedia

    en.wikipedia.org/wiki/Universal_Combat

    Universal Combat – A World Apart is a sequel to the original Universal Combat games. The game was originally announced on 18 November 2004 as an expansion pack for Universal Combat, which would feature newer and more advanced technologies found in the then-upcoming Universal Combat – Hostile Intent and Galactic Command Online. [17]

  8. Universal coefficient theorem - Wikipedia

    en.wikipedia.org/wiki/Universal_coefficient_theorem

    For example, it is common to take to be /, so that coefficients are modulo 2. This becomes straightforward in the absence of 2- torsion in the homology. Quite generally, the result indicates the relationship that holds between the Betti numbers b i {\displaystyle b_{i}} of X {\displaystyle X} and the Betti numbers b i , F {\displaystyle b_{i,F ...

  9. Universal quantification - Wikipedia

    en.wikipedia.org/wiki/Universal_quantification

    In symbolic logic, the universal quantifier symbol (a turned "A" in a sans-serif font, Unicode U+2200) is used to indicate universal quantification. It was first used in this way by Gerhard Gentzen in 1935, by analogy with Giuseppe Peano's (turned E) notation for existential quantification and the later use of Peano's notation by Bertrand Russell.