Introductory Combinatorics
Introductory Combinatorics
5th Edition
ISBN: 9780136020400
Author: Richard A. Brualdi
Publisher: Prentice Hall
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Chapter 11, Problem 5E
To determine

To prove: A graph of order n2 always has two vertices of same degree using the pigeonhole principle and explain the same for multigraphs.

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Q3)A: Given H(x,y)=x2-x+ y²as a first integral of an ODEs, find this ODES corresponding to H(x,y) and show the phase portrait by using Hartman theorem and by drawing graph of H(x,y)-e. Discuss the stability of critical points of the corresponding ODEs.
Q/ Write Example is First integral but not Conservation system.
Q/ solve the system X° = -4X +2XY-8 y°= 2 4y² - x2

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Introductory Combinatorics

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