The Nature of Mathematics, 12th Edition
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Chapter1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 7
Chapter 8
Chapter 9
Chapter 10
Chapter 11
Chapter 12
Chapter 13
Chapter 14
Chapter 15
Chapter 16
Chapter 17
Chapter 18
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Reference Topics

An historical reference, along with a solution and interesting links for the Konigsberg bridge problem is found at this site:
http://mathforum.org/isaac/problems/bridgesol1.html

This site from Math 103 at the University of Alabama provides a nice overview of spanning trees.
http://www.ctl.ua.edu/math103/

This site provides a nice discussion of minimum spanning trees.
http://www.cs.usask.ca/resources/tutorials/csconcepts/1999_8/tutorial/advanced/prim/mst.html

This is a nice interactive demonstration of Krukal's algorithm:
http://www.cs.usask.ca

Problem 44 presents "The Oracle of Bacon." You will have fun with this site playing this trivia game.
http://oracleofbacon.org/