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  2. Semicircle - Wikipedia

    en.wikipedia.org/wiki/Semicircle

    The Farey sequence of order n is the sequence of completely reduced fractions which when in lowest terms have denominators less than or equal to n, arranged in order of increasing size. With a restricted definition, each Farey sequence starts with the value 0, denoted by the fraction ⁠ 0 / 1 ⁠ , and ends with the fraction ⁠ 1 / 1 ⁠ .

  3. Separation axiom - Wikipedia

    en.wikipedia.org/wiki/Separation_axiom

    These conditions are given in order of increasing strength: Any two topologically distinguishable points must be distinct, and any two separated points must be topologically distinguishable. Any two separated sets must be disjoint, any two sets separated by neighbourhoods must be separated, and so on.

  4. Cycles and fixed points - Wikipedia

    en.wikipedia.org/wiki/Cycles_and_fixed_points

    G has 2 fixed points, 1 2-cycle and 3 4-cycles B has 4 fixed points and 6 2-cycles GB has 2 fixed points and 2 7-cycles P * (1,2,3,4) T = (4,1,3,2) T Permutation of four elements with 1 fixed point and 1 3-cycle. In mathematics, the cycles of a permutation π of a finite set S correspond bijectively to the orbits of the subgroup generated by π ...

  5. Farey sequence - Wikipedia

    en.wikipedia.org/wiki/Farey_sequence

    In mathematics, the Farey sequence of order n is the sequence of completely reduced fractions, either between 0 and 1, or without this restriction, [a] which when in lowest terms have denominators less than or equal to n, arranged in order of increasing size.

  6. Set-theoretic limit - Wikipedia

    en.wikipedia.org/wiki/Set-theoretic_limit

    In mathematics, the limit of a sequence of sets,, … (subsets of a common set ) is a set whose elements are determined by the sequence in either of two equivalent ways: (1) by upper and lower bounds on the sequence that converge monotonically to the same set (analogous to convergence of real-valued sequences) and (2) by convergence of a sequence of indicator functions which are themselves ...

  7. Limit set - Wikipedia

    en.wikipedia.org/wiki/Limit_set

    fixed points; periodic orbits; limit cycles; attractors; In general, limits sets can be very complicated as in the case of strange attractors, but for 2-dimensional dynamical systems the Poincaré–Bendixson theorem provides a simple characterization of all nonempty, compact -limit sets that contain at most finitely many fixed points as a fixed point, a periodic orbit, or a union of fixed ...

  8. Dedekind–MacNeille completion - Wikipedia

    en.wikipedia.org/wiki/Dedekind–MacNeille...

    The time for using their method to add a single element to the completion of a partial order is O(cnw) where w is the width of the partial order, that is, the size of its largest antichain. Therefore, the time to compute the completion of a given partial order is O(cn 2 w) = O(cn 3). [12]

  9. List of set identities and relations - Wikipedia

    en.wikipedia.org/wiki/List_of_set_identities_and...

    Inclusion is a partial order: Explicitly, this means that inclusion, which is a binary operation, has the following three properties: [3] Reflexivity : L ⊆ L {\textstyle L\subseteq L} Antisymmetry : ( L ⊆ R and R ⊆ L ) if and only if L = R {\textstyle (L\subseteq R{\text{ and }}R\subseteq L){\text{ if and only if }}L=R}