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Aug 17, 2018 at 18:49 comment added Roman Hric Of course, it was clear after opening your link to counterexamples. Anyway, even the question might be dumb, the answers might be useful also to someone else.
Aug 17, 2018 at 18:42 comment added Alex M. Since second-countability is equivalent to metrizability, and since there are separable compact Hausdorff spaces that are not metrizable (see my couterexamples link), it follows that separability is weaker than second-countability.
Aug 17, 2018 at 18:37 comment added Roman Hric I should have formulated my question as follows: Is separability equivalent to 2nd countability in compact Hausdorff spaces? Sure I did the web search but didn't succeed to find the counterexamples.
Aug 17, 2018 at 17:19 comment added Alex M. See also math.stackexchange.com/q/83652, math.stackexchange.com/q/1642751, math.stackexchange.com/q/573805, math.stackexchange.com/q/234018. Even more counterexamples here: math.stackexchange.com/q/74923. A web search (like I did) would have made posting your question needless.
Aug 17, 2018 at 17:08 history answered Alex M. CC BY-SA 4.0