Theorems · Theorem · algebraic topology

Topology.RelCWComplex.cellFrontier_subset_base_union_finite_closedCell

∀ {X : Type u_1} [t : TopologicalSpace X] {C D : Set X} [inst : Topology.RelCWComplex C D] (n : ℕ)
  (i : Topology.RelCWComplex.cell C n),
  ∃ I, Topology.RelCWComplex.cellFrontier n i ⊆ D ∪ ⋃ m, ⋃ (_ : m < n), ⋃ j ∈ I m, Topology.RelCWComplex.closedCell m j

Defined in

Mathlib.Topology.CWComplex.Classical.Basic

Cited by

3 results in Mathlib

Foundations

Depth 154 from the axioms · uses propext, Classical.choice, Quot.sound

Assumes

TopologicalSpaceTopology.RelCWComplex