Date of Publication
2009
Document Type
Dissertation
Degree Name
Doctor of Philosophy in Mathematics
Subject Categories
Mathematics
College
College of Science
Department/Unit
Mathematics and Statistics
Thesis Adviser
Severino V. Gervacio
Defense Panel Member
Yvette F. Lim
Leonor A. Ruivivar
Blessilda P. Raposa
Isagani B. Jos
Erminda Fortes,
Abstract/Summary
The intersection graph of a non-empty family L of line segments in the plane, denoted by (L), is defined as the graph whose vertex-set is L, where there is an edge between two vertices `1 and `2 in L if `1 \ `2 6= . If L is a family of half-lines, (L) is called a half-line intersection graph. We de ne here a graph whose half-line representation L can be contained in an arbitrarily thin φ-slice of the plane (the convex subset of R2 bounded by two half-lines with a common end-point and making an angle of (radians) with each other, 0 < φ < π ) as wedge graphs. We show that wedge graphs are closed under the graph operations union and join. We prove that wedge graphs are segment intersection graphs and unit intersection graphs. We also determine the effects of other graph operations such as cartesian product, conjunction, composition and power on some special graphs.
Abstract Format
html
Language
English
Format
Electronic
Accession Number
CDTG004564
Shelf Location
Archives, The Learning Commons, 12F Henry Sy Sr. Hall
Physical Description
v, 71 leaves ; 28 cm.
Keywords
Intersection graph theory
Recommended Citation
Sespene, E. M. (2009). A class of intersection graph of half-lines and of line segments in the plane. Retrieved from https://animorepository.dlsu.edu.ph/etd_doctoral/238
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