411 REFERENCE · Wiktionary
Gδ
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
Translingual
Gδ set
Etymology
From mul de Gebiet neighborhood for 'G' and German de Durchschnitt intersection for the 'δ'.
Symbol
mul symbol Gδ
mul analysis topology A countable intersection of open sets.
Hypernyms
mul Borel set
mul Measure theory