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  2. Complemented subspace - Wikipedia

    en.wikipedia.org/wiki/Complemented_subspace

    The choice of can matter quite strongly: every complemented vector subspace has algebraic complements that do not complement topologically. Because a linear map between two normed (or Banach ) spaces is bounded if and only if it is continuous , the definition in the categories of normed (resp. Banach ) spaces is the same as in topological ...

  3. Complement (group theory) - Wikipedia

    en.wikipedia.org/wiki/Complement_(group_theory)

    A p-complement is a complement to a Sylow p-subgroup. Theorems of Frobenius and Thompson describe when a group has a normal p -complement . Philip Hall characterized finite soluble groups amongst finite groups as those with p -complements for every prime p ; these p -complements are used to form what is called a Sylow system .

  4. Indicator function - Wikipedia

    en.wikipedia.org/wiki/Indicator_function

    In classical mathematics, characteristic functions of sets only take values 1 (members) or 0 (non-members). In fuzzy set theory, characteristic functions are generalized to take value in the real unit interval [0, 1], or more generally, in some algebra or structure (usually required to be at least a poset or lattice).

  5. Complement (set theory) - Wikipedia

    en.wikipedia.org/wiki/Complement_(set_theory)

    If A is a set, then the absolute complement of A (or simply the complement of A) is the set of elements not in A (within a larger set that is implicitly defined). In other words, let U be a set that contains all the elements under study; if there is no need to mention U, either because it has been previously specified, or it is obvious and unique, then the absolute complement of A is the ...

  6. Complemented lattice - Wikipedia

    en.wikipedia.org/wiki/Complemented_lattice

    Hasse diagram of a complemented lattice. A point p and a line l of the Fano plane are complements if and only if p does not lie on l.. In the mathematical discipline of order theory, a complemented lattice is a bounded lattice (with least element 0 and greatest element 1), in which every element a has a complement, i.e. an element b satisfying a ∨ b = 1 and a ∧ b = 0.

  7. Kuratowski's closure-complement problem - Wikipedia

    en.wikipedia.org/wiki/Kuratowski's_closure...

    In point-set topology, Kuratowski's closure-complement problem asks for the largest number of distinct sets obtainable by repeatedly applying the set operations of closure and complement to a given starting subset of a topological space. The answer is 14. This result was first published by Kazimierz Kuratowski in 1922. [1]

  8. Reciprocal polynomial - Wikipedia

    en.wikipedia.org/wiki/Reciprocal_polynomial

    This is used in the special number field sieve to allow numbers of the form x 11 ± 1, x 13 ± 1, x 15 ± 1 and x 21 ± 1 to be factored taking advantage of the algebraic factors by using polynomials of degree 5, 6, 4 and 6 respectively – note that φ (Euler's totient function) of the exponents are 10, 12, 8 and 12.

  9. Cancellation property - Wikipedia

    en.wikipedia.org/wiki/Cancellation_property

    To say that an element a in a magma (M, ∗) is left-cancellative, is to say that the function g : x ↦ a ∗ x is injective. [1] That the function g is injective implies that given some equality of the form a ∗ x = b, where the only unknown is x, there is only one possible value of x satisfying the equality.

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