Example image of eyePlorer eyePlorer map for 'Nowhere dense set': Dense set Neighbourhood (mathematics) Subset Topological space Topology Closure (topology) Empty set Integer Interior (topology) Real line Finite set Union (set theory) Ideal (set theory) Negligible set Countable set Meagre set Sigma-ideal Baire category theorem Lebesgue measure Unit interval Nodec space Smith–Volterra–Cantor set Porous set Cantor set Generic property Open mapping theorem (functional analysis) Baire space Martin's axiom Uniform boundedness principle Complete metric space Invertible matrix Fuchsian group Locally compact space Wiener process Glossary of topology