Closed integral curves in 3-space and isotopic two-dimensional deformations
Closed integral curves in 3-space and isotopic two-dimensional deformations
If there is given an isotopic of a two-dimensional euclidean plane E onto itself, one can adjoin to every point P of E a certain closed curve, the so-called of P (?1). If the indicatrix does not pass through P, we introduce the order of P relative to its indicatrix …