Thin set (analysis)
In mathematical analysis, a thin set is a subset of n-dimensional complex space Cn with the property that each point has a neighbourhood on which some non-zero holomorphic function vanishes. Since the set on which a holomorphic function vanishes is closed and has empty interior, a thin set is nowhere dense, and the closure of a thin set is also thin.
The fine topology was introduced in 1940 by Henri Cartan to aid in the study of thin sets.
