[B2] T.F. Banchoff, Triple points and singularities of projections of smoothly immersed surfaces,The author proves that the number of triple points in an immersion of a smooth surface is congruent modulo 2 to the Euler characteristic of the surface, and that the homology class of the double set of an immersion is a topological invariant. He gives a geometric interpretation of Whitney duality.Proc. Amer. Math. Soc.46(1974) 402-406.

* 10/12/94 dpvc@geom.umn.edu -- *

*The Geometry Center*