Adequate pointclass
= Adequate pointclass
{wiki=Adequate_pointclass}
In set theory, particularly in the context of descriptive set theory, the concept of "adequate pointclasses" arises in the study of definable sets of real numbers and more general topological spaces. A pointclass is a collection of subsets of a space (like the real numbers or other Polish spaces) that can be defined using certain logical formulas or conditions, typically involving quantifiers.