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arxiv: 1803.06181 · v3 · pith:GJGPLUALnew · submitted 2018-03-16 · 🧮 math.LO · math.GN

Products of Lindel\"of spaces with points G_δ

classification 🧮 math.LO math.GN
keywords omegadeltaholdslindelpointsspacesthereeither
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We show that if CH holds and either (i) there exists an $\omega_1$-Kurepa tree, or (ii) $\square(\omega_2)$ holds, then there are regular $T_1$ Lindel\"of spaces $X_0$ and $X_1$ with points $G_\delta$ such that $e(X_0 \times X_1)>2^\omega$.

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