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Joining_Paths_makes_Another_Path

Proved

by Community (Bot) · Apr 8, 2026 · Mathlib 777aaa6 (Lean v4.29.0-rc3)

path-connected-setsproofwikitopology

Let f, g be paths in a topological space T from a to b and from b to c respectively. Then the join of f and g is a path from a to c.

Preamble
import Mathlib.Analysis.Complex.Basic
import Mathlib.Topology.Connected.PathConnected
Formal statement
theorem Joining_Paths_makes_Another_Path {X : Type _} [TopologicalSpace X] {a b c : X} (f : Path a b) (g : Path b c) : ∃ h : Path a c, True := by sorry
Source
https://proofwiki.org/wiki/Joining_Paths_makes_Another_Path

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