[isabelle-dev] Strange phenomenon with presburger

Florian Haftmann florian.haftmann at informatik.tu-muenchen.de
Tue Mar 10 11:21:48 CET 2009

lemma "\<And>m n x. x \<in> P \<Longrightarrow> Suc (2 * m) = 2 * n
\<Longrightarrow> False"
  apply presburger done

lemma "\<And>m n x. P x \<Longrightarrow> Suc (2 * m) = 2 * n
\<Longrightarrow> False"
  apply presburger -- fails

This phenomenon already occurs in Isabelle 2008 and still persists.  The
confusing fact is that neither x nor P matter anyway.

Any idea?




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