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+.TH FACTOR 3M
+.SH NAME
+factor
+.SH DESCRIPTION
+function factor.f
+
+source
+  Bevington, page 32.
+
+purpose
+  calculates factorial function for integers
+
+usage
+  result = factor (n)
+
+description of parameters
+  n      - integer argument
+
+subroutines and function subprograms required
+  none