The New Encyclopædia Britannica: The new Encyclopædia BritannicaEncyclopædia Britannica, 1992 |
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Page 611
... problem Graph theory 616 Definitions Enumeration of graphs Characterization problems of graph theory Planar graphs The four - colour map problem Eulerian cycles and the Königsberg bridge problem Directed graphs Combinatorial geometry ...
... problem Graph theory 616 Definitions Enumeration of graphs Characterization problems of graph theory Planar graphs The four - colour map problem Eulerian cycles and the Königsberg bridge problem Directed graphs Combinatorial geometry ...
Page 614
... problem , though easy to state , proved very diffi- cult to solve . A complete and rigorous solution was not achieved until the early 1960s . The importance of the problem lies in the fact that it is the simplest model that exhibits the ...
... problem , though easy to state , proved very diffi- cult to solve . A complete and rigorous solution was not achieved until the early 1960s . The importance of the problem lies in the fact that it is the simplest model that exhibits the ...
Page 621
... problem ( or a completely different problem ) and by showing that a solution of the general problem that is extremal in some sense provides also a solution to the original problem . Frequently there seems to be very little connection ...
... problem ( or a completely different problem ) and by showing that a solution of the general problem that is extremal in some sense provides also a solution to the original problem . Frequently there seems to be very little connection ...
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