منابع مشابه
NeST graphs
We establish results on NeST graphs (intersection tolerance graphs of neighborhood subtrees of a tree) and several subclasses. In particular, we show the equivalence of proper NeST graphs and unit NeST graphs, the equivalence of 5xed distance NeST graphs and threshold tolerance graphs, and the proper containment of NeST graphs in weakly chordal graphs. The latter two results answer questions of...
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Felgenhauer and Jarvis famously showed in [2], although it was first mentioned earlier, in [7], that there are 6,670,903,752,021,072,936,960 possible completed Sudoku boards. In a later paper, Jarvis and Russell [8] used a Sudoku symmetry group of size 3, 359, 232 · 9! = 1, 218, 998, 108, 160 and Burnside’s Lemma to show that there are 5,472,730,538 essentially different Sudoku boards. Both of ...
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ژورنال
عنوان ژورنال: Discrete Applied Mathematics
سال: 2002
ISSN: 0166-218X
DOI: 10.1016/s0166-218x(01)00207-4