paulson [Wed, 24 May 2000 12:21:26 +0200] rev 8944
restored NatSum.thy
paulson [Tue, 23 May 2000 18:29:17 +0200] rev 8943
now 0 is overloaded
paulson [Tue, 23 May 2000 18:28:11 +0200] rev 8942
added type constraint ::nat because 0 is now overloaded
paulson [Tue, 23 May 2000 18:24:48 +0200] rev 8941
IntRingDefs is now redundant
paulson [Tue, 23 May 2000 18:22:19 +0200] rev 8940
new type class "zero" so that 0 can be overloaded
paulson [Tue, 23 May 2000 18:21:51 +0200] rev 8939
finally sum_below is overloaded properly
paulson [Tue, 23 May 2000 18:19:06 +0200] rev 8938
Multisets have a zero: the empty multiset
paulson [Tue, 23 May 2000 18:14:57 +0200] rev 8937
defining 0::int to be (int 0)
paulson [Tue, 23 May 2000 18:08:52 +0200] rev 8936
Now that 0 is overloaded, constant "zero" and its type class "zero" are
no longer needed. Also IntRingDefs is redundant
paulson [Tue, 23 May 2000 18:06:22 +0200] rev 8935
added type constraint ::nat because 0 is now overloaded