# Article

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Keywords:
regular $F_{\sigma}$-subsets; almost realcompactness; almost* realcompactness; r-weak cb; regular Oz; regular countably paracompact
Summary:
A new generalization of realcompactness based on ultrafilters of regular $F_{\sigma}$-subsets is introduced. Its relationship with realcompactness, almost realcompactness, almost* realcompactness, c-realcompactness is examined. Some of the properties of the newly introduced space is studied as well.
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