How to define a partial function in Isabelle?...

Access a definition from a locale...

What does it mean for a fact used in Isabelle to have a number after the name?...

undefined type name in polymorphic datatype in isabelle...

Why do I get this exception on an induction rule for a lemma?...

How do I prove a subgoal with bound variables with assumptions that have schematic variable?...

Sledgehammer within Locale...

Empty Delta lemma prove in Isabelle...

How to define a lemma towards inductive predicate that can not hold...

The lemma defined in fun can work, but can not work in inductive predicate...

Could not find lexicographic termination order...

Bad name in Iseabelle, how to fix it...

"Illegal schematic variable(s)" in code generated by proof (cases rule: ...)`...

The induction proof in Isabelle: given a subgoal, how to create the right auxiliary lemma...

Some question on the lemma prove in Isabelle...

Instantiate type classes in locale contexts...

Express that a function is constant on a set...

behaviour of Isabelle foldl compared to SML...

Locale ignores operation notation...

Proving correctness and termination of an (imperative) algorithm using Isabelle...

Is there a way to apply the rule to a specific assumption in Isabelle?...

How to prove exists goal in this Isabelle/HOL lemma?...

Induction on second argument Isar...

Induction introduces 'bad name'...

Nested cases Isar...

How do I prove that 4 is even using Isabelle...

Why is this simple proof with real numbers not proven by auto (or even sledgehammer)...

Isabelle/HOL foundations...

What is the automation support for theories other than HOL in Isabelle?...

Proving simple theorem about cases mod 10...