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Independence results concerning the number of nowhere dense sets necessary to cover the real line. (English) Zbl 0269.02033

##### MSC:
 3e+15 Descriptive set theory 3e+35 Consistency and independence results
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##### References:
 [1] P. J. Cohen,Set theory and the continuum hypothesis, W. A. Benjamin, New York (1966). · Zbl 0182.01301 [2] P. Erdos andA. Hajnal, Some remarks on set theory VIII,Michigan Math. J.,7 (1960), pp. 187–191. · Zbl 0095.03902 [3] S. H. Hechler, On the set theoretical independence of the existence of certain kinds of cofinal subsets of{$$\omega$$}{$$\omega$$} under a natural partial ordering, to appear inAxiomatic Set Theory, Proceedings of Symposia in Pure Mathematics,13 pt. 2, ed. Dana Scott, Amer. Math. Soc., Providence, Rhode Island. [4] D. A. Martin andR. M. Solovay, Internal Cohen extensions,Ann. of Math. Logic,2 (1970), pp. 143–178. · Zbl 0222.02075 [5] A. R. D. Mathias, A survey of recent results in set theory, to appear inAxiomatic Set Theory, Proceedings of Symposia in Pure Mathematics,13 pt. 2., ed. Dana Scott, Amer. Math. Soc., Providence, Rhode Island. [6] R. M. Solovay andS. Tennenbaum, Iterated Cohen extensions and Souslin’s Problem,Ann. of Math.,94 (1971), pp. 201–245. · Zbl 0244.02023 [7] P. Vopěnka andK. Hrbáček, The consistency of some theorems on real numbers.Bull. Acad. Polon, Sci. Sér. Sci. Math. Astronom. Phys.,15 (1967), pp. 107–111.
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