How to prove such a lemma that one hold and other holds, the concat of two still holds...

How to reuse type variables from locales...

How to have full control over substitution in Isabelle...

Isar: Failed to retrieve literal fact...

Isabelle multiply both sides of an equation (equational reasoning in Isar)...

What is `ind` type in Isabelle...

Bad number of arguments for type constructor in Isabelle/hol...

Function definition with one argument as index...

What is INF in Isabelle...

Topological filters in Isabelle...

Isabelle Failed to refine any pending goal during instantiation...

How to type boldface symbols in Isabelle...

Isabelle `subst` but replace right side with left side...

Isabelle order type-class on lambda expressions...

Function termination proof in Isabelle...

Isabelle instantiation with type parameter...

Isabelle/Pure Isabelle/HOL Isabell/Isar conceptual questions...

Max of set in Isabelle...

Do I need to save Isabelle files to import them?...

Print the name of a fact in a document antiquotation...

How to proceed in Isabelle when the goal has implications and existentials?...

De Bruijn indices in Isabelle and Coq...

Type Unification failed for bool * bool ⇒ bool * bool...

Datatype declaration by datatype in Standard ML...

How can I input the special character ⇩ in Isabelle/jedit?...

Isabelle exercise proof that trev (trev t) = t...

Ring structure induced by a bijection...

type variable in datatype definition...

Isabelle definitions with subscripts...

What do double brackets mean in Isabelle?...