Chromatic Homotopy Theory
《Chromatic Homotopy Theory》 · 第 181 页 · Section 6.4.1，Proposition 6.4.2
Two homeomorphisms \(\phi,\psi:D^n\longrightarrow D^n\) that coincide on \(\partial D^n\) are continuously isotopic, via an isotopy that fixes \(\partial D^n\) pointwise.