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  2. Free group - Wikipedia

    en.wikipedia.org/wiki/Free_group

    Each vertex represents an element of the free group, and each edge represents multiplication by a or b. In mathematics, the free group F S over a given set S consists of all words that can be built from members of S, considering two words to be different unless their equality follows from the group axioms (e.g. st = suu −1 t but s ≠ t −1 ...

  3. Factor graph - Wikipedia

    en.wikipedia.org/wiki/Factor_graph

    with a corresponding factor graph shown on the right. Observe that the factor graph has a cycle. If we merge (,) (,) into a single factor, the resulting factor graph will be a tree. This is an important distinction, as message passing algorithms are usually exact for trees, but only approximate for graphs with cycles.

  4. Tree decomposition - Wikipedia

    en.wikipedia.org/wiki/Tree_decomposition

    In graph theory, a tree decomposition is a mapping of a graph into a tree that can be used to define the treewidth of the graph and speed up solving certain computational problems on the graph. Tree decompositions are also called junction trees, clique trees, or join trees. They play an important role in problems like probabilistic inference ...

  5. Cayley–Dickson construction - Wikipedia

    en.wikipedia.org/wiki/Cayley–Dickson_construction

    Cayley Q8 graph of quaternion multiplication showing cycles of multiplication of i (red), j (green) and k (blue). In the SVG file, hover over or click a path to highlight it. The next step in the construction is to generalize the multiplication and conjugation operations. Form ordered pairs (a, b) of complex numbers a and b, with multiplication ...

  6. 2-factor theorem - Wikipedia

    en.wikipedia.org/wiki/2-factor_theorem

    In the mathematical discipline of graph theory, the 2-factor theorem, discovered by Julius Petersen, is one of the earliest works in graph theory. It can be stated as follows: [ 1 ] Let G {\displaystyle G} be a regular graph whose degree is an even number, 2 k {\displaystyle 2k} .

  7. Graph factorization - Wikipedia

    en.wikipedia.org/wiki/Graph_factorization

    The Petersen graph can be partitioned into a 1-factor (red) and a 2-factor (blue). However, the graph is not 1-factorable. In graph theory, a factor of a graph G is a spanning subgraph, i.e., a subgraph that has the same vertex set as G. A k-factor of a graph is a spanning k-regular subgraph, and a k-factorization partitions the edges of the ...

  8. Multiplicative group of integers modulo n - Wikipedia

    en.wikipedia.org/wiki/Multiplicative_group_of...

    For powers of 2 the factor (/) is not cyclic unless k = 0, 1, 2, but factors into cyclic groups as described above. The order of the group φ ( n ) {\displaystyle \varphi (n)} is the product of the orders of the cyclic groups in the direct product.

  9. Factorial - Wikipedia

    en.wikipedia.org/wiki/Factorial

    1 1: 1 2: 2 3: 6 4: 24 5: ... matching to within a constant factor the time for fast multiplication algorithms for numbers ... into the number of words that can be ...

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