Zulip Chat Archive

Stream: mathlib4

Topic: Category-theoretic applicative functors


Vilim Lendvaj (Oct 10 2025 at 14:18):

Hello everyone!
I've written instance (F : Type u → Type v) [Applicative F] [LawfulApplicative F] : (ofTypeFunctor F).LaxMonoidal and I'd like to make a PR to put it into Mathlib.
Where do I put it? CategoryTheory.Monoidal.Types.Basic? CategoryTheory.Monoidal.Types.Functor? CategoryTheory.Monoidal.Functor.Types?

Vilim Lendvaj (Oct 10 2025 at 15:26):

Well, for now I've made a PR: https://github.com/leanprover-community/mathlib4/pull/30407
It's my first contribution so please tell me everything I did wrong :man_bowing:

Yaël Dillies (Oct 10 2025 at 15:28):

Hint: You can type #30407 and Zulip will render it as #30407

Vilim Lendvaj (Oct 10 2025 at 15:29):

Thaw would be more work, since it's one click to select the entire URL bar, but two clicks to select a word to copy it.

Vilim Lendvaj (Oct 10 2025 at 15:29):

But I guess it takes up less space in the message
I'll do that in the future.


Last updated: Dec 20 2025 at 21:32 UTC