Lean 4 is no longer being developed in private; this was true a year ago but is no longer true. What is true is that Lean 4 is still not ready for the port of the maths library to begin, and we do not know when it will…
There is every way of knowing how much will be obsolete in Lean 4, as long as you're following the discussions at https://leanprover.zulipchat.com . The type theory of Lean 4 will be the same as Lean 3, there are some…
The headline is clickbait. A more measured debate about the issues is here https://xenaproject.wordpress.com/2019/09/27/does-anyone-kno...
https://xenaproject.wordpress.com/2019/09/27/does-anyone-kno...
In Lean you could do theorem and_commutative (p q : Prop) : p ∧ q → q ∧ p := by cc for a tactic proof and theorem and_commutative (p q : Prop) : p ∧ q → q ∧ p := λ ⟨h,j⟩,⟨j,h⟩ for a term proof (just write down the…
Lean 4 is no longer being developed in private; this was true a year ago but is no longer true. What is true is that Lean 4 is still not ready for the port of the maths library to begin, and we do not know when it will…
There is every way of knowing how much will be obsolete in Lean 4, as long as you're following the discussions at https://leanprover.zulipchat.com . The type theory of Lean 4 will be the same as Lean 3, there are some…
The headline is clickbait. A more measured debate about the issues is here https://xenaproject.wordpress.com/2019/09/27/does-anyone-kno...
https://xenaproject.wordpress.com/2019/09/27/does-anyone-kno...
In Lean you could do theorem and_commutative (p q : Prop) : p ∧ q → q ∧ p := by cc for a tactic proof and theorem and_commutative (p q : Prop) : p ∧ q → q ∧ p := λ ⟨h,j⟩,⟨j,h⟩ for a term proof (just write down the…