Another answer was given by Aarts and De Groot in Complete regularity as a separation axiom Canadian Journal of Mathematics 21 1969 96–105. Frink's condition sets things up for a proof a la Urysohn's Lemma; Aarts and De Groot' Groot's condition is in terms of subbases and the proof proceeds by constructing a Hausdorff compactification.
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Another answer was given by Aarts and De Groot in Complete regularity as a separation axiom Canadian Journal of Mathematics 21 1969 96–105. Frink's condition sets things up for a proof a la Urysohn's Lemma; Aarts and De Groot' condition is in terms of subbases and the proof proceeds by constructing a Hausdorff compactification. |
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