Let tau be the topology generated by (a,infty):ainR on R. In this topology, the closure of 0 in R is:

Q59Section II (Mathematics)59 of 190

Closure in the upper-ray topology: everything not strictly above

Let $\tau$ be the topology generated by $\{(a,\infty):a\in\mathbb{R}\}$ on $\mathbb{R}$ . In this topology, the closure of $\{0\}$ in $\mathbb{R}$ is:

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