Work backwards from goal in structured (isar) proof...

Isar: Failed to retrieve literal fact...

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

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

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

Instantiate type classes in locale contexts...

Induction on second argument Isar...

Induction introduces 'bad name'...

Nested cases Isar...

Proving basic properties of recursive "less than" definition for naturals in Isabelle...

Referencing current assumptions in Isabelle...

Accumulating results while using them in Isabelle/Isar...

Isabelle "Failed to apply proof method" when working with two theory files...

How to use the base case assumption when proving with 'induct' in Isabelle...

How to prove the existence of inverse functions in Isabelle/HOL?...

How to use obtain in existential proofs?...

Can Isabelle lemma be used for stating fact about definition?...

what's the distinction between `shows` and `obtains` in Isabelle Isar?...

Simplifying if-then-else in summations or products...

Local assumptions in "state" mode...

How does one use basic propositional rules in Isar to prove `A ⟶ A ∨ B`?...

Is it possible to write non-automatic formalizations in Isar?...

Recall Isabelle's "Go to the definition" command. (Isar, JEdit)...

How to use a definition written on locale parameters in the assumptions of the locale?...

How to pass assumptions to interpretation of locale...

In Isabelle, what do the angle brackets and double asterisks mean?...

Access elements of data types...

Custom case distinctions in proofs...

How can I efficiently prove existential propositions with multiple variables in Isabelle/Isar?...

Reordering goals (Isabelle)...