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Old 2015-10-27, 01:22   #43
wblipp
 
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"William"
May 2003
New Haven

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Quote:
Originally Posted by R.D. Silverman View Post
Textbooks cost money.
Are you sure? Did you try? Googling free elementary number book textbooks turned up these three that look reasonable.

The first leads to a legal free copy of a Springer-Verlag textbook
The second appears to be a serious community committed to creating free textbooks

http://wstein.org/ent/
http://www.saylor.org/2013/05/blog-f...d-under-cc-by/
http://pressitt.com/smnr/free-elemen...allenge/24456/
http://shell.cas.usf.edu/~wclark/#EL..._NUMBER_THEORY
http://oer.avu.org/handle/123456789/7
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