[isabelle-dev] Wrong ring hierarchy in Isabelle 2007

[Florian Haftmann]

> I just discovered that another last minute "FIXME" has changed the 
> hierarchy of rings in Isabelle2007 such that "real" is not of sort 
> "lordered_ring" any more. More generally, "ordered_ring" is not an 
> "lordered_ring" any more. This is pretty unfortunate as it renders the 
> whole HOL-Complex-Matrix package in Isabelle 2007 garbage. Maybe in the 
> future one should refrain from last minute fixes which one does not 
> fully understand.

This change is due to the changed and unified formalization of lattices
in HOL.  Providing an instance real :: lattice should be sufficient.

	Florian
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