Looking at a domain which is like an annulus (inner radius $r$ and outer radius $s>r$) can there be a (square)root function defined on it?
If it can't be single valued, is it possible to define one which is not single valued?
Looking at a domain which is like an annulus (inner radius $r$ and outer radius $s>r$) can there be a (square)root function defined on it?
If it can't be single valued, is it possible to define one which is not single valued?