Abstract
We introduce a set theoretic axiom

which is weaker than

as well as axiom F. Using (CH) and

we prove the existence of a locally compact, T2, locally countable, first countable, hereditarily separable, sequentially compact non-compact space X. The one point compactification X* of X is a compact, T2, C-space (meaning X* is of countable tightness) which is not sequential. We also construct a compact, T2, C-space Y which is not sequential using only the continuum hypothesis (CH). This solves some well known problems on S-spaces and also on compact C-spaces under least set theoretic axioms.
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Reference
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Rajagopalan, M. (1977). Compact C-spaces and S-spaces. In: Novák, J. (eds) General Topology and Its Relations to Modern Analysis and Algebra IV. Lecture Notes in Mathematics, vol 609. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0068682
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DOI: https://doi.org/10.1007/BFb0068682
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Print ISBN: 978-3-540-08437-2
Online ISBN: 978-3-540-37108-3
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