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Creating a macro/elab which converts a new identifier into two existing identifiers...

confusion over meaning of underscore `_` in simple Lean example...

Mathlib keeps rebuilding even after I `lake exe cache get`...

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Use obtain in tactic mode in Lean theorem prover...

Output of #check Nat.add...

How to change current working directory in Lean 4?...

How to do function composition in Lean 4?...

In Lean is there automatic detection of nearly identical definitions?...

How to prove a = b → a + 1 = b + 1 in lean?...

Leverage theorem in the reals for the natural numbers...

Proving that set A ≠ (Aᶜ)...

Prove by matching specific natural numbers in Lean...

Does the type Prop get special treatment by Lean?...

How to use sockets in Lean?...

Reducing Array Initialisers...

how to install mathlib in my lake4 toolchain?...

what's the difference between `simp` and `simp!`? Where is `simp!` defined?...

How to prove 1+1=2 in Lean4 "inline"?...

Checked Non-Terminating Recursive Def?...

Why Does Rewrite Fail to Bind?...

How can I resolve the type class instance error related to defining a function R in Lean in order to...

Trace tauto, finish...

definitions with fin types (lean)...

Prove (p → ¬ q) → ¬ (p ∧ q) in Lean4...

Lean4: Proving that `(xs = ys) = (reverse xs = reverse ys)`...

Definition of choice in Lean...

disjunction commutativity in Lean 4...

Assume in lean 4...