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But the two first set already cover all plane. In fact, for any point (x,y), either x<y or y ≤ x, so we have, for any point (x,y), x<y or y<x+1.
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A search of the literature (google, mathse, mathoverflow, dan ma's topology blog, Willard, Engelking, etc) shows that the terminology
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https://www.semanticscholar.org/paper/A-NOTE-ON-STRONGLY-LINDELO%CC%88F-SPACES-Ganster/04b50b66a69e898fb5fec820765244f07d9beddc
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Knowledge. If you would like to participate, please visit the project page, where you can join
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It would be cool if this article provided some examples of spaces that are and aren't Lindelöf. -
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for example). For these reasons, I will flip the role of the two terms and make
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The following set of sets is presented as a cover for
Sorgenfrey plane S
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3. For each real x, the half-open rectangle [x, x + 2) × [−x, −x + 2)
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3. For each real x, the half-open rectangle [x, x + 2) × [−x, −x + 2)
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is sometimes used with a different meaning altogether (see
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