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