DSA Open Book
( 2 π σ 2 exp { ( x − μ ) 2 σ 2 } ) − 1 2 {\displaystyle \left(2\pi \sigma ^{2}\operatorname {exp} \left\{{\frac {\left(x-\mu \right)^{2}}{\sigma ^{2}}}\right\}\right)^{-{\frac {1}{2}}}}
http://www.scribd.com/doc/191694547/Calculating-Pythagorean-Triples
