Proceedings of the American Mathematical Society, Vol. 42, No. 2 (Feb., 1974), pp. 588-594 (7 pages) For any topological space X there is an associated ultrametric space U(X) such that the cartesian ...
A set of vertices S of a connected graph G is a nonseparating independent set if S is independent and G–S is connected. The nsis number 𝒵(G) is the maximum cardinality of a nonseparating independent ...
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