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The Arkhangel'skiĭ–Tall problem under Martin’s Axiom

The Arkhangel'skiĭ–Tall problem under Martin’s Axiom

We show that MA$_{σ-centered}(ω_1)$ implies that normal locally compact metacompact spaces are paracompact, and that MA($ω_1$) implies normal locally compact metalindelöf spaces are paracompact. The latter result answers a question of S. Watson. The first