Real Algebraic Threefolds IV: Del Pezzo Fibrations

الأصل · EN

This is the fourth of a series of papers studying real algebraic threefolds, but the methods are mostly independent from the previous ones. Let f:X→ C be a map of a smooth projective real algebraic 3-fold to a curve C whose general fibers are rational surfaces. Assume that the set of real points of X is an orientable 3-manifold M. The aim of the paper is to give a topological description of M.