{"version":"1.0","type":"link","title":"Pointclass - Newikis","description":"In the mathematical field of descriptive set theory, a pointclass is a collection of sets of points, where a point is ordinarily understood to be an element of some perfect Polish space. In practice, a pointclass is usually characterized by some sort of definability property; for example, the…","provider_name":"Newikis","provider_url":"https://newikis.com","cache_age":86400}