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Homework Statement
We are given ##H## = {##O | \forall x, \exists a,b \in R## s.t ##x \in [a,b] \subseteqq O##}##\bigcup {\oslash}##
and are asked to show that it is a topology on R
Homework Equations
Definition of a topological space
The Attempt at a Solution
I am trying to convince myself that R is in H. I do not see it. This is, of course, the first property of a topological space.