a set with a collection of subsets or open sets satisfying the properties that the union of open sets is an open set, the intersection of two open sets is an open set, and the given set and the empty set are open sets.
Read more in this article about some frequently asked questions and fun facts related to our definitions.
Is English Leaving Space?
Earlier this week, NASA announced that it is looking for new astronauts. Though NASA has sent its last shuttle into space, it will continue to send astronauts to the International Space Station through a collaboration with the Russian Federal Space Agency. NASA has promised to help staff the International Space Station (ISS) through at least 2020. So the ISS will continue to host astronauts from around …
Origin of topological space
First recorded in 1945–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
maths a set S with an associated family of subsets τ that is closed under set union and finite intersection. S and the empty set are members of τ
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012