It is possible to enter type variables distinguished only by sort constraint on the Isar level:
lemma assumes "P TYPE('a::order)" and "Q TYPE('a::group_add)" shows "R TYPE('a::power)" using assms proof - It is not clear to me whether this his always been possible that way or slipped in due to some change. Florian -- Home: http://www.in.tum.de/~haftmann PGP available: http://home.informatik.tu-muenchen.de/haftmann/pgp/florian_haftmann_at_informatik_tu_muenchen_de
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