src/HOL/Extraction/ROOT.ML

"prod" and "sum" replace "*" and "+" respectively

(* Examples for program extraction in Higher-Order Logic *)

no_document use_thys ["Efficient_Nat", "~~/src/HOL/Number_Theory/UniqueFactorization"];
use_thys ["Greatest_Common_Divisor", "Warshall", "Higman", "Pigeonhole", "Euclid"];