Independence ratios of nearly planar graphs

author: Michael Albertson, Smith College
published: Sept. 7, 2007,   recorded: September 2007,   views: 4437


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With purposeful imprecision, a graph is said to be nearly planar if it resembles in some essential way a planar graph. Classic measures of near planarity include the thickness, the crossing number, and the genus. Modern versions of nearly planar graphs include the graphs embedded on surfaces with large width (shortest noncontractible cycle). Geometric graph theory has given us a different notion of locally planar as well as two definitions of quasi-planar graphs. This talk will begin with a retrospective look at independence ratios of locally planar graphs. We consider contrasts between results about the independence ratio and those about the chromatic number. We will then proceed to results and open questions about independence ratios of various classes of nearly planar graphs.

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