Licensing issues have prompted the removal of all source reliant on Gamma.java. Gamma.java explicitly stated that it was "based on" an implementation from Numerical Recipes in C. Please see http://www.nr.com/infotop.html - these implementations (and derivatives of these works) are covered under restrictive licensing terms. This code will be removed from the repository until these issues can be addressed.
jakarta/commons/proper/math/trunk/src/java/org/apache/commons/math/distribution/ChiSquaredDistribution.java
jakarta/commons/proper/math/trunk/src/java/org/apache/commons/math/special/