Mathlib Map

Theorems · Inductive type · order theory

Order.PFilter

(P : Type u_1) → [Preorder P] → Type u_1

A filter on a preorder P is a subset of P that is - nonempty - downward directed - upward closed.

Defined in
Mathlib.Order.PFilter
Cited by
32 results in Mathlib
Foundations
Depth 1 from the axioms · uses no axioms
Assumes
Preorder

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Mathlib declarations this one mentions in its statement or cites explicitly in its proof. Plumbing is filtered out.

Cited by53

Results whose statement or proof uses this declaration.