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Old 2010-12-07, 18:49   #4
CRGreathouse
 
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Aug 2006

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For basic introductions, see
http://www.cut-the-knot.org/blue/Modulo.shtml
http://www.math.rutgers.edu/~erowlan...rithmetic.html

For more depth, I suggest finding a basic number theory textbook, maybe at a local library. Alternately, here are some online texts:
http://www.math.usf.edu/~eclark/elem_num_th_book.pdf
http://shoup.net/ntb/
http://modular.math.washington.edu/ent/
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