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Perfectly-normal space

From Encyclopedia of Mathematics
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A normal space in which every closed subset is a $G_\delta$-set (cf. Set of type $F_\sigma$ ($G_\delta$)).

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References

[a1] E. Čech, "Topological spaces" , Interscience (1966) pp. 532
How to Cite This Entry:
Perfectly-normal space. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Perfectly-normal_space&oldid=33670