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P. H. Sorgenfrey, Minimal regular spaces, Proc. Amer. Math. Soc. 14 (1963), 454–458. [5] N. Bourbaki, Espaces minimaux et espaces complètement séparés, C. R. Acad. Sci. Paris 212 (1941), 215– 218. E. Cameron, Maximal and minimal topologies, Trans. Amer. Math. Soc. 160 (1971), 229–248. [7] E. Hewitt, A problem of set-theoretic topology, Duke Math. J. 10 (1943), 309–333. J. D. McCartan, Singular sets and maximal topologies, Proc. Amer. Math. Soc. 127 (11) (1998), 3375–3382. E. Larson, Minimal T0 -spaces and maximal TD spaces, Pacific J.

3. Minimal topologies The study of minimal topological spaces has been much more intense than that of maximal spaces. ) Properties whose minimality has been investigated include normal, Urysohn, paracompact, Tychonoff, regular, locally compact and low separation axioms, that is, those lying in logical strength between T0 and Hausdorff. A brief survey of some minimality results may be found in [11]. , α and β generate the same filter), • minimal completely regular if and only if it is compact and Hausdorff, • minimal normal if and only if it is compact and Hausdorff, • minimal Urysohn if and only if it is Urysohn and every filter with a unique cluster point converges to this point, • minimal (locally compact and Hausdorff) if and only if it is compact and Hausdorff, • minimal paracompact if and only if it is compact and Hausdorff, • minimal metric only if it is compact and Hausdorff, • minimal completely normal if and only if it is compact and Hausdorff, • minimal completely Hausdorff if and only if it is compact and Hausdorff, • minimal T0 if and only if it is T0 , nested and generated by the family {X \ {x}: x ∈ X} ∪ {∅, X}, • minimal TD if and only if it is TD and nested, • minimal TA if and only if it is TA and partially nested, • minimal TF if and only if either there exists x ∈ X such that T = C ∩ I(x) or there exists a non-empty proper non-singleton subset Y of X such that T = D(Y ).

If T and S are two topologies on X with S ⊆ T , then S is said to be weaker or coarser than T and T is said to be stronger or finer than S. Given a topological invariant P , a member T of LT (X) is said to be minimal (maximal) P if and only if T possesses property P but no weaker (stronger) member of LT (X) possesses property P . P is said to be expansive (contractive) if and only if for each P -member of LT (X), every stronger (weaker) member of LT (X) is also P . 2. Maximal topologies The concept of minimal topologies was first introduced in 1939 by Parhomenko [12] when he showed that compact Hausdorff spaces are minimal Hausdorff.

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