# HG changeset patch # User huffman # Date 1158262586 -7200 # Node ID 588ba06ba867e8a4ab7c15f3ba37d0bdacba76f2 # Parent a7b2f90f698d1a0e6654efe6f63b94648ec3f0ea add instance for class division_ring diff -r a7b2f90f698d -r 588ba06ba867 src/HOL/Hyperreal/StarClasses.thy --- a/src/HOL/Hyperreal/StarClasses.thy Thu Sep 14 20:31:10 2006 +0200 +++ b/src/HOL/Hyperreal/StarClasses.thy Thu Sep 14 21:36:26 2006 +0200 @@ -300,6 +300,12 @@ instance star :: (comm_ring_1) comm_ring_1 .. instance star :: (idom) idom .. +instance star :: (division_ring) division_ring +apply (intro_classes) +apply (transfer, erule left_inverse) +apply (transfer, erule right_inverse) +done + instance star :: (field) field apply (intro_classes) apply (transfer, erule left_inverse)