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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