Geodesic
Approximations of $\sigma$-classes and $\pi$-classes
Commentationes Mathematicae Universitatis Carolinae, Tome 20 (1979) no. 4, pp. 669-679 Cet article a éte moissonné depuis la source Czech Digital Mathematics Library

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}
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Mlček, Josef. Approximations of $\sigma$-classes and $\pi$-classes. Commentationes Mathematicae Universitatis Carolinae, Tome 20 (1979) no. 4, pp. 669-679. http://geodesic.mathdoc.fr/item/CMUC_1979_20_4_a4/

[Č-V 1] K. ČUDA P. VOPĚNKA: Real and imaginary classes in the alternative set theory. Comment. Math. Univ. Carolinae 20 (1979), 639-653. | MR

[S-V 2] A. SOCHOR P. VOPĚNKA: Revealments. to appear in Comment. Math. Univ. Carolinae 21 (1980). | MR

[V] P. VOPĚNKA: Mathematics in the alternative set theory. Teubner-Texte, Leipzig, 1979. | MR