he used Boolean algebra to characterise the topology of an abstract space independently of the notion of points. Subsequent research showed that, together with Felix Hausdorff's definition of topological space in terms of neighbourhoods, the closure operator yielded more fertile results than the axiomatic theories based on Maurice Fréchet's convergence (1906) and Frigyes Riesz's point of accumulation (1907). Translation in context Traduction en contexte Traducción en contexto Tradução em contexto Traduzione in contesto Übersetzung im Kontext الترجمة في السياق 文脈に沿った翻訳 Vertaling in context תרגום בהקשר Перевод в контексте Tłumaczenie w kontekście Traducere în context Översättning i sammanhang İçerik tercümesi Переклад у контексті