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?
Florian
--
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