divisibility by 3 theorem, contributed by Benjamin Porter,
#85 in http://www.cs.ru.nl/~freek/100/
(* Title: HOL/Isar_examples/ROOT.ML
ID: $Id$
Author: Markus Wenzel, TU Muenchen
Miscellaneous Isabelle/Isar examples for Higher-Order Logic.
*)
time_use_thy "BasicLogic";
time_use_thy "Cantor";
time_use_thy "Peirce";
time_use_thy "Drinker";
time_use_thy "ExprCompiler";
time_use_thy "Group";
time_use_thy "Summation";
time_use_thy "KnasterTarski";
time_use_thy "MutilatedCheckerboard";
time_use_thy "ThreeDivides";
with_path "../NumberTheory" (no_document time_use_thy) "Primes";
with_path "../NumberTheory" time_use_thy "Fibonacci";
time_use_thy "Puzzle";
time_use_thy "NestedDatatype";
time_use_thy "HoareEx";