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  2. Graph canonization - Wikipedia

    en.wikipedia.org/wiki/Graph_canonization

    The canonical form of a graph is an example of a complete graph invariant: every two isomorphic graphs have the same canonical form, and every two non-isomorphic graphs have different canonical forms. [1] [2] Conversely, every complete invariant of graphs may be used to construct a canonical form. [3]

  3. Canonical form - Wikipedia

    en.wikipedia.org/wiki/Canonical_form

    A canonical form is a labeled graph Canon(G) that is isomorphic to G, such that every graph that is isomorphic to G has the same canonical form as G. Thus, from a solution to the graph canonization problem, one could also solve the problem of graph isomorphism : to test whether two graphs G and H are isomorphic, compute their canonical forms ...

  4. Weisfeiler Leman graph isomorphism test - Wikipedia

    en.wikipedia.org/wiki/Weisfeiler_Leman_graph...

    The next example is about regular graphs. WLtest cannot distinguish regular graphs of equal order, [4]: 31 but WLpair can distinguish regular graphs of distinct degree even if they have the same order. In fact WLtest terminates after a single round as seen in these examples of order 8, which are all 3-regular except the last one which is 5-regular.

  5. Jordan normal form - Wikipedia

    en.wikipedia.org/wiki/Jordan_normal_form

    The diagonal entries of the normal form are the eigenvalues (of the operator), and the number of times each eigenvalue occurs is called the algebraic multiplicity of the eigenvalue. [3] [4] [5] If the operator is originally given by a square matrix M, then its Jordan normal form is also called the Jordan normal form of M. Any square matrix has ...

  6. Automatic group - Wikipedia

    en.wikipedia.org/wiki/Automatic_group

    In mathematics, an automatic group is a finitely generated group equipped with several finite-state automata.These automata represent the Cayley graph of the group. That is, they can tell whether a given word representation of a group element is in a "canonical form" and can tell whether two elements given in canonical words differ by a generator.

  7. Companion matrix - Wikipedia

    en.wikipedia.org/wiki/Companion_matrix

    the linear mapping : makes a cyclic []-module, having a basis of the form {,, …,}; or equivalently [] / (()) as []-modules. If the above hold, one says that A is non-derogatory . Not every square matrix is similar to a companion matrix, but every square matrix is similar to a block diagonal matrix made of companion matrices.

  8. Boolean function - Wikipedia

    en.wikipedia.org/wiki/Boolean_function

    Full (canonical) conjunctive normal form, an AND of ORs each containing every argument or complement ; Blake canonical form, the OR of all the prime implicants of the function; Boolean formulas can also be displayed as a graph: Propositional directed acyclic graph. Digital circuit diagram of logic gates, a Boolean circuit

  9. Chromatic polynomial - Wikipedia

    en.wikipedia.org/wiki/Chromatic_polynomial

    When x is a natural number, this problem is normally viewed as computing the number of x-colorings of a given graph. For example, this includes the problem #3-coloring of counting the number of 3-colorings, a canonical problem in the study of complexity of counting, complete for the counting class #P.

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