theorem Set.Nonempty.monotheorem Set.Nonempty.mono: ∀ {α : Type u} {s t : Set α}, s ⊆ t → s.Nonempty → t.Nonempty
Published by @sam · Jul 21, 2026
View source in zpg9xh52
zpg9xh52
Definitional, with no premises to accept.
Set.Nonempty.mono
definitional fact