Peter Petersen
= Peter Petersen
{c}
Peter Petersen authored an exposition of <smooth manifolds>, <transversality> and <de Rham cohomology>. Among its structural results is <Ehresmann fibration theorem>, which turns a proper <submersion> into a locally trivial <fiber bundle>. This connects a differential condition on a map with a uniform local description of all its fibers.<Manifolds, Transversality, and de Rham Cohomology by Peter Petersen>[Preface and Section 3.3, Theorem 3.3.4]{ref}