Is inclusion of topologies a topology? – math.stackexchange.com

Is inclusion of topologies a topology? – math.stackexchange.com

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Let's consider the following inclusion chain of topologies on space $X$: $\tau_1\subset\tau_2\subset\cdots\subset\tau_n\subset\cdots$. Let $\tau=\bigcup_{n=1}^\infty \tau_n$. Is $\tau$ a topology? ...

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