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MATH 213 (1)
Zhang Yi (1)
Lecture

Chapter 9.2.docx

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Department
Mathematics
Course
MATH 213
Professor
Zhang Yi
Semester
Spring

Description
Def A directed graph consists of a set V of vertices or nodes together with a set E of ordered pairs of elements of V called edges or arcs The vertex a is called the initial vertex of the edge a b and the vertex b is called the terminal vertex of this edgeAn edge of the form a a is called a loopEx Aa b cdRa b b a b b c b a dReflexivealoop a aSymmetrica bb a in the opposite directionAntisymmetricedge a b abedge b a in the opposite directionTransitivea bb cedge a c95 Eq
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