If
and 
(i.e., a and b are relatively prime), then
.
Courant, R. and Robbins, H. What Is Mathematics?: An Elementary Approach to Ideas and Methods, 2nd ed. Oxford, England: Oxford University Press, p. 36, 1996.
Shanks, D. Solved and Unsolved Problems in Number Theory, 4th ed. New York: Chelsea, p. 56, 1993.
Eric W. Weisstein. "Cancellation Law."
From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/CancellationLaw.html
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