On Lichnerowicz smooth homotopy invariants for \(G\)-structures. (English) Zbl 0808.53029
The authors prove that under suitable general hypothesis a homotopy invariant \(k_{\xi \eta} (\phi)\) can be considered for smooth maps \(\phi : (M,g) \to (W,h)\) between Riemannian manifolds which admit “canonically” defined \(p\)-forms \(\xi \in \Lambda^ p M\) and \(\eta \in \Lambda^ p N\).
Reviewer: Fl.Gouli-Andreou (Thessaloniki)