BILATERAL CONGENITAL ABSENCE OF PUPILLARY APERTURE
AMERICAN JOURNAL OF OPHTHALMOLOGY, vol.112, no.5, pp.608-609, 1991 (SCI-Expanded, Scopus)
- Publication Type: Article / Letter
- Volume: 112 Issue: 5
- Publication Date: 1991
- Doi Number: 10.1016/s0002-9394(14)76875-8
- Journal Name: AMERICAN JOURNAL OF OPHTHALMOLOGY
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.608-609
- Dokuz Eylül University Affiliated: No
Abstract
A space $X$ has a $\mathbb{Q}$-diagonal if $X^2\setminus \Delta$ has a $\mathcal{K}(\mathbb{Q})$-directed compact cover. We show that any compact space with a $\mathbb{Q}$-diagonal is metrizable, hence any Tychonorff space with a $\mathbb{Q}$-diagonal is cosmic. These give a positive answer to Problem 4.2 and Problem 4.8 in \cite{COT11} raised by Cascales, Orihuela and Tkachuk.