[isabelle] Isabelle 2007 -> Isabelle 2009

I want to convert some Isabelle 2007 stuff to Isabelle 2009. I encountered problems with this:

datatype float = Float int int

instance float :: zero
  Zero_float_def: "0 \<equiv> Float 0 0" ..

How do I write this the Isabelle 2009 way? Any quick idea?

Steven Obua

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