\(G\)-structures of second order defined by linear operators satisfying algebraic relations
The author discusses higher order analogues of almost product and almost tangent structures on manifolds. These structures are defined by endomorphisms of the vector bundle of second order tangent vectors of the manifold \(V\), say \(J:T^2 V\to T^2V\). They are also identified as reductions of the second order frame bundle of \(V\).
scientific article; zbMATH DE number 1146194