pseudocircle

English

Etymology

pseudo- +‎ circle

Noun

pseudocircle (plural pseudocircles)

1. (mathematics) The finite topological space X consisting of four distinct points { a, b, c, d } with the non-Hausdorff topology $\left\{\{a,b,c,d\},\{a,b,c\},\{a,b,d\},\{a,b\},\{a\},\{b\},\emptyset \right\}$.