Complete accumulation point
A complete accumulation point of a set $M$ in a topological space $X$ is a point $x\in X$ such that the intersection of $M$ with any neighbourhood of $x$ has the same cardinality as the entire set $M$.
|[ArPo]||A.V. Arkhangel'skii, V.I. Ponomarev, "Fundamentals of general topology: problems and exercises", Reidel (1984) (Translated from Russian)|
Complete accumulation point. Encyclopedia of Mathematics. URL: http://www.encyclopediaofmath.org/index.php?title=Complete_accumulation_point&oldid=27203