Set.Subset.trans

∀ {α : Type u} {a b c : Set α}, a ⊆ b → b ⊆ c → a ⊆ c

Defined in: Mathlib.Data.Set.Basic
Cited by: 218 results in Mathlib
Foundations: Depth 6 from the axioms, rests on 10 definitions · uses no axioms

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