The natural domain of a function is the maximal chain of domains on which it can be analytically continued to a single-valued function.
Natural Domain
See also
Analytic Continuation, Domain, Natural Boundary, Single-Valued FunctionExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Natural Domain." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/NaturalDomain.html