Abstract
The fundamental concepts in topological spaces, in particular separation axioms, are presented in a manner that open sets are replaced by more general ones.
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Császár, Á. Separation axioms for generalized topologies. Acta Mathematica Hungarica 104, 63–69 (2004). https://doi.org/10.1023/B:AMHU.0000034362.97008.c6
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DOI: https://doi.org/10.1023/B:AMHU.0000034362.97008.c6