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  2. Block graph - Wikipedia

    en.wikipedia.org/wiki/Block_graph

    In graph theory, a branch of combinatorial mathematics, a block graph or clique tree [1] is a type of undirected graph in which every biconnected component (block) is a clique. Block graphs are sometimes erroneously called Husimi trees (after Kôdi Husimi ), [ 2 ] but that name more properly refers to cactus graphs , graphs in which every ...

  3. Two-graph - Wikipedia

    en.wikipedia.org/wiki/Two-graph

    Switching {X,Y} in a graph. A two-graph is equivalent to a switching class of graphs and also to a (signed) switching class of signed complete graphs.. Switching a set of vertices in a (simple) graph means reversing the adjacencies of each pair of vertices, one in the set and the other not in the set: thus the edge set is changed so that an adjacent pair becomes nonadjacent and a nonadjacent ...

  4. Biconnected component - Wikipedia

    en.wikipedia.org/wiki/Biconnected_component

    This gives immediately a linear-time 2-connectivity test and can be extended to list all cut vertices of G in linear time using the following statement: A vertex v in a connected graph G (with minimum degree 2) is a cut vertex if and only if v is incident to a bridge or v is the first vertex of a cycle in C – C 1.

  5. Building blocks (toy) - Wikipedia

    en.wikipedia.org/wiki/Building_blocks_(toy)

    The building blocks are usually sold in building block sets with building instructions, less often as single-variety or mixed bulk. In addition to the main model of a set, building instructions for an alternative model ("B-model") are occasionally included, often advertised as such ("2-in-1", "3-in-1").

  6. Glossary of graph theory - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_graph_theory

    Every edge of a graph belongs in exactly one block. 2. The block graph of a graph G is another graph whose vertices are the blocks of G, with an edge connecting two vertices when the corresponding blocks share an articulation point; that is, it is the intersection graph of the blocks of G. The block graph of any graph is a forest. 3.

  7. Complete bipartite graph - Wikipedia

    en.wikipedia.org/wiki/Complete_bipartite_graph

    The star graphs K 1,3, K 1,4, K 1,5, and K 1,6. A complete bipartite graph of K 4,7 showing that Turán's brick factory problem with 4 storage sites (yellow spots) and 7 kilns (blue spots) requires 18 crossings (red dots) For any k, K 1,k is called a star. [2] All complete bipartite graphs which are trees are stars.

  8. Toy block - Wikipedia

    en.wikipedia.org/wiki/Toy_block

    Physical benefits: toy blocks build strength in a child's fingers and hands, and improve eye-hand coordination. They also help educate children in different shapes. Social benefits: block play encourages children to make friends and cooperate, and is often one of the first experiences a child has playing with others. Blocks are a benefit for ...

  9. Unit block - Wikipedia

    en.wikipedia.org/wiki/Unit_block

    Pratt based her blocks on a similar but larger-scale block system designed by educator Patty Hill, a follower of Friedrich Fröbel, the originator of kindergarten education. Fröbel's series of 20 age-calibrated educational "gifts" had included a set of eight blocks, sized ½ by 1 by 2 inches, or a 1:2:4 ratio, which could be formed into a cube ...

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