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Upper bounds for the bondage number of graphs on topological surfaces
Bondage number Domination number Topological surface
2011/2/22
The bondage number b(G) of a graph G is the smallest number of edges of G whose removal from G results in a graph having the domination number larger than that of G. We show that, for a graph G having...
Leibniz's Principles and Topological Extensions
topological extensions nonstandard models transfer principle
2011/2/24
Three philosophical principles are often quoted in connection with Leib-niz: “objects sharing the same properties are the same object”, “everything can possibly exist, unless it yields contradiction”,...