Weak covering properties and selection principles

No convenient internal characterization of spaces that are productively Lindelof is known. Perhaps the best general result known is Alster's internal characterization, under the Continuum Hypothesis, of productively Lindelof spaces which have a basis of cardinality at most $\aleph_1$. It turns out that topological spaces having Alster's property are also productively weakly Lindelof. The weakly Lindelof spaces form a much larger class of spaces than the Lindelof spaces. In many instances spaces having Alster's property satisfy a seemingly stronger version of Alster's property and consequently are productively X, where X is a covering property stronger than the Lindelof property. This paper examines the question: When is it the case that a space that is productively X is also productively Y, where X and Y are covering properties related to the Lindelof property.Comment: 16 page

Vooroordelen van Nederlanders tegenover joden

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Etnocentrisme in Nederland: Theoretische bijdragen empirisch getoetst

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Social conditions, authoritarianism and ethnocentrism: A theoretical model of the early Frankfurt School updated and tested

Contains fulltext : 3331.pdf (publisher's version ) (Open Access)To explain ethnocentrism in the Netherlands, a classic model derived from theoretical notions of prominent members of the Frankfurt School is updated and tested with data of a national sample of Dutch respondents (N = 1799). It appears that authoritarianism is a far more important predictor of ethnocentrism than predictors related to one's social condition, although the latter are not insignificant. In turn, authoritarianism is predicted by education, age, social class, church involvement and status-anxiety