Примеры использования Crossing number на Английском языке и их переводы на Русский язык
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It is also expected that a satellite of a knot K should have larger crossing number than K, but this has not been proven.
is the unique knot with a crossing number of four.
There are efficient algorithms for determining whether the crossing number is less than a fixed constant k.
In knot theory, the stevedore knot is one of three prime knots with crossing number six, the others being the 62 knot and the 63 knot.
Morwen Thistlethwaite helped prove the Tait conjectures, which are: Reduced alternating diagrams have minimal link crossing number.
is the smallest cubic graph with that crossing number sequence A110507 in the OEIS.
because of the NP-completeness of the special case of testing whether the 2-page crossing number is zero.
The minimal graphs that have a given crossing number have pathwidth that is bounded by a function of their crossing number. .
The crossing number(the minimum number of edges which cross in any graph drawing)
not with zero crossings, so its crossing number is one.
Book embeddings have also been used to define several other graph invariants including the pagewidth and book crossing number.
By way of example, the unknot has crossing number zero, the trefoil knot three
within which the graph can be simplified while leaving the crossing number unchanged.
otherwise we could interchange the intersecting parts of the two edges and reduce the crossing number by one.
just two knots have crossing number five, but the number of knots with a particular crossing number increases rapidly as the crossing number increases.
A simple proof of this follows from the crossing number inequality: if m cells have a total of x+ n edges, one can form
It is straightforward to show that graphs with bounded crossing number have bounded chromatic number: one may assign distinct colors to the endpoints of all crossing edges
equivalently that every graph with crossing number k has chromatic number Ok1/4.
In 2009, Exoo conjectured that the smallest cubic graph with crossing number 11 is the Coxeter graph, the smallest cubic graph with crossing number 13 is the Tutte-Coxeter graph and the smallest cubic graph with crossing number 170 is the Tutte 12-cage.
The crossing number inequality states that, for an undirected simple graph G with n vertices