Put in minimal simpset to avoid excessive simplification,
just as in revision 1.9 of HOL/indrule.ML
(* Title: HOL/RelPow.thy
ID: $Id$
Author: Tobias Nipkow
Copyright 1996 TU Muenchen
R^n = R O ... O R, the n-fold composition of R
*)
RelPow = Nat +
consts
"^" :: "('a * 'a) set => nat => ('a * 'a) set" (infixr 100)
defs
rel_pow_def "R^n == nat_rec id (%m S. R O S) n"
end