Sentence:  Given two orientable Riemannian manifolds "V"<sub>1</sub> and "V"<sub>2</sub>, one may ask whether a non-constant <WSD>quasiregular</WSD> map &#x1D453; : "V"<sub>1</sub> → "V"<sub>2</sub> exists. 
Meaning of the word marked with <WSD> tags:  Having certain properties in common with holomorphic functions of a single complex variable.