Runge's theorem, Cousin I and II, Ahlfors-Schwarz-Pick Lemma, Riemann Mapping Theorem, Möbius transformations, hyperbolicity, metrics of negative curvature, Picard's Theorem, Schottky's Theorem, ...
Chebyshev's theorem is any of several theorems proven by Russian mathematician Pafnuty Chebyshev. Seamless Wikipedia browsing. On steroids. Every time you click a link to Wikipedia, Wiktionary or ...