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  • We simply used the de Morgan's Laws<!--\index{de Morgan's Laws}-->. ...eighborhoods $\gamma$, prove directly, i.e., without using the de Morgan's Laws, that the set $\sigma _{\gamma}$ of all closed sets with respect to $\gamma
    27 KB (4,693 words) - 02:35, 20 June 2019
  • *[[de Morgan's Laws|de Morgan's Laws]]
    16 KB (1,773 words) - 00:41, 17 February 2016