On the critical points of harmonic functions
Tokunosuke Yosida · Proceedings of the Japan Academy Series A Mathematical Sciences · 1969
1o We admit as 2-cells the homeomorph of any convex polygon," regarding the vertices and edges o this image as 0 and 1-cells respectively.An /-complex is a connected set o a finite number o /-cells (i-1, 2) and the characteristic p of a complex is defined as.p----ao+a--a, where a is the number o /-cells (i--0, 1, 2) in the complex.The object of this paper is to give another proof to a 2)