Resumen de Invariance of the naturally lifted metrics on linear frame bundles over affine manifolds
Oldrich Kowalski 
, Masami Sekizawa
The natural lifts from affine manifolds to linear frame bundles have been classified by the second author in 1988. In this paper we prove the invariance Theorem for these natural lifts. But, at the beginning, we insert a short survey about some �prominent� natural lifts studied earlier by the present authors.
