Isabelle definitions with subscripts...

What do double brackets mean in Isabelle?...

Add `example` as an Isar synonym for `lemma`...

Is it possible to convert all higher-order logic and dependent type in Lean/Isabelle/Coq into first-...

"Double loop" set comprehension...

How to add an elimination rule to auto?...

Turning a value[simp] example into a lemma. With functions in them...

Dynamically retrieve variable name - is it possible?...

What are all the isabelle/slashes?...

Generate a list of nats, like [1..n] generates a list of ints...

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...

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?...