Go to type class instance definition in Lean 4...

Difference between let and have keywords in lean 4...

Basic question about eq.subst substitution rules...

erase common constant of equation using leanprover...

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

How to do cases on a function between finite types?...

infix notation in Lean...

Combining two simple assumptions in Lean...

Natural Number Game goals completed with error (invalid begin-end expression, comma expected)...

How to prove distributivity (propositional validity property 6) in LEAN?...

How can I define a function in Lean prover? (In "A function is injective then has left inverse&...

When `rw` tactic in Lean completes the proof?...

How do I define a type for a point in R^n for arbitrary n in Lean 4?...

prove p or q iff q or p in Lean...

Difference between the curly and round brackets for propositions in a theorem...

Is Lean 4 lazy or strict?...

Induction on integers in Lean creates non-int types...

Loops in Lean programming language...

LEAN: Proving f(x) is non-negative implies f(x+a) is non-negative...

Resolving a "diamond inheritance" class in lean...

How to prove that x < y → x ≤ y - 2 if both are odd or both are even in Lean?...

How to prove r → (∃ x : α, r) in Lean...

How can I convert logical clause to LEAN?...

How to use the summation sign in lean?...

Cases tactic in Lean does not create hypothesis...

Define a function inside of a proof in Lean...

Lean 3 immediately hangs on import statements...

Lean 4 'unknown identifier Proof'...

rw expression IN expression...

Is there a prefix notation in Lean?...