Zulip Chat Archive
Stream: mathlib4
Topic: associativity of `∘L`
Jireh Loreaux (Jul 10 2025 at 17:47):
The infix notation ∘L for continuous linear maps is declared to be right associative, which conflicts with the fact that * is declared left associative.
Consequently, f₁ ∘L f₂ ∘L f₃ = f₁ * f₂ * f₃ is not defeq, which is super annoying. Is there a reason we've caused ourselves this headache?
Aaron Liu (Jul 10 2025 at 17:50):
That looks like it should be defeq
Jireh Loreaux (Jul 10 2025 at 17:52):
Oh nevermind, I'm an idiot
Jireh Loreaux (Jul 10 2025 at 17:55):
I was having a different problem and misdiagnosed.
Aaron Liu (Jul 10 2025 at 19:08):
I imagine the reason is because comp is also declared to be right associative.
Last updated: Dec 20 2025 at 21:32 UTC