The forcing convexity number of a graph
Gary Chartrand, Ping Zhang (2001)
Czechoslovak Mathematical Journal
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For two vertices and of a connected graph , the set consists of all those vertices lying on a – geodesic in . For a set of vertices of , the union of all sets for is denoted by . A set is a convex set if . The convexity number of is the maximum cardinality of a proper convex set of . A convex set in with is called a maximum convex set. A subset of a maximum convex set of a connected graph is called a forcing subset for if is the unique maximum...