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+.TH GAMMA 3M
+.SH NAME
+gamma
+.SH DESCRIPTION
+function gamma.f
+
+source
+ Bevington, page 126.
+
+purpose
+ calculate gamma function for integers and 1/2-integers
+
+usage
+ result = gamma (x)
+
+description of parameters
+ x - integer or half-integer
+
+subroutines or function subprograms required
+ factor (n)
+ calculates n factorial for integers