Über die totale Absolutkrümmung verknoteter Sphären
Nous montrons qu’une surface minimale complété, plongée dans , de courbure totale finie et homéomorphe a moins deux points est l’hélicoïde.
In this paper we consider non-compact cylinder-like surfaces called unduloids and study some aspects of their geometry. In particular, making use of a Kenmotsu-type representation of these surfaces, we derive explicit formulas for the lengths and areas of arbitrary segments, along with a formula for the volumes enclosed by them.
In this note we prove that any integral closed -form , , on a m-dimensional manifold , , is the restriction of a universal closed -form on a universal manifold as a result of an embedding of to .