enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Genus (mathematics) - Wikipedia

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

    Thus, a planar graph has genus 0, because it can be drawn on a sphere without self-crossing. The non-orientable genus of a graph is the minimal integer n such that the graph can be drawn without crossing itself on a sphere with n cross-caps (i.e. a non-orientable surface of (non-orientable) genus n). (This number is also called the demigenus.)

  3. Word equation - Wikipedia

    en.wikipedia.org/wiki/Word_equation

    A word equation is a formal equality:= = between a pair of words and , each over an alphabet comprising both constants (c.f. ) and unknowns (c.f. ). [1] An assignment of constant words to the unknowns of is said to solve if it maps both sides of to identical words.

  4. Oppenheimer–Snyder model - Wikipedia

    en.wikipedia.org/wiki/Oppenheimer–Snyder_model

    In general relativity, the Oppenheimer–Snyder model is a solution to the Einstein field equations based on the Schwarzschild metric describing the collapse of an object of extreme mass into a black hole. [1] It is named after physicists J. Robert Oppenheimer and Hartland Snyder, who published it in 1939. [2]

  5. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.

  6. Combinatorics on words - Wikipedia

    en.wikipedia.org/wiki/Combinatorics_on_words

    With finite automata, the edges are labeled with a letter in an alphabet. To use the graph, one starts at a node and travels along the edges to reach a final node. The path taken along the graph forms the word. It is a finite graph because there are a countable number of nodes and edges, and only one path connects two distinct nodes. [1]

  7. Toroidal graph - Wikipedia

    en.wikipedia.org/wiki/Toroidal_graph

    A cubic graph with 14 vertices embedded on a torus The Heawood graph and associated map embedded in the torus. In the mathematical field of graph theory, a toroidal graph is a graph that can be embedded on a torus. In other words, the graph's vertices and edges can be placed on a torus such that no edges intersect except at a vertex that ...

  8. Word-representable graph - Wikipedia

    en.wikipedia.org/wiki/Word-representable_graph

    Wheel graphs W 2n+1, for n ≥ 2, are not word-representable and W 5 is the minimum (by the number of vertices) non-word-representable graph. Taking any non-comparability graph and adding an apex (a vertex connected to any other vertex), we obtain a non-word-representable graph, which then can produce infinitely many non-word-representable ...

  9. Logistic map - Wikipedia

    en.wikipedia.org/wiki/Logistic_map

    If we restrict the variables to 0 ≤ x ≤ 1, then the range of the parameter r is necessarily restricted to 0 to 4 (0 ≤ r ≤ 4). This is because if is in the range [0, 1], then the maximum value of + is r/4. Thus, when r > 4, the value of + can exceed 1. On the other hand, when r is negative, x can take negative values.

  1. Related searches what are holes in graphs made in word equation 1 16 7 then find r

    what are holes in graphs made in word equation 1 16 7 then find r 2