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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Links

History

This is one of the best all around sites that I have found. It is titled "The MacTutor History of Mathematics Archive."
http://www-history.mcs.st-and.ac.uk/~history

This is an award-winning site that links to all sorts of mathematics information.
http://archives.math.utk.edu/

Augustus De Morgan:
http://www-history.mcs.st-and.ac.uk/~history/Mathematicians/De_Morgan.html

Reference Topics

This site gives some interesting practice with combined operations with sets:
http://ww2.unime.it/dipart/i_fismed/wbt/mirror/moe/tests/mengen/duv.html

Venn diagrams with two, three, and four sets:
If you click on the question mark, you can practice with three overlapping sets. http://www.math.csusb.edu/notes/sets/node5.html

This site shows a statement of De Morgan's law.
http://www.demorgan.com/demorgan.htm

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