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...

Certified calculations in a proof assistant...

Isabelle structure proof...

Unable to evaluate expressions with a reflexive transitive closure...

How to prove that a recursive function has some value...

Isabelle/jEdit: Emacs Set Mark does not work...

Evaluate complex set comprehension expression...

How to make Isabelle use basic math rules?...

How can I have multiple arbitrary types in a typeclass definiton in Isabelle?...

How to use "using" in "apply" with Isabelle...

Transformation of goals by "rule"...

How do I define syntax and translations for this datatype?...

Is there a way to name and refer to a assumption in Isabelle apply-scripts?...

How to introduce forall in Isabelle...

How to show the defintion of functions in Isabelle...

Defining a predicate; need prop=>bool...

How to understand syntax and translation in Isabelle...

Isabelle labeled graph definition...

Simple Cardinality Proof...

Using `defines` with induction...

cases vs case_tac/induct vs induct_tac...

How to include statement about type of the variable in the Isabelle/HOL term...