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On some invariants of unary algebras. (English) Zbl 0333.08004

MSC:

08Axx Algebraic structures
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References:

[1] M. Novotný: O jednom problému z teorie zobrazení. Publ. Fac. Sci. Univ. Masaryk, No 344 (1953), 53-64.
[2] M. Novotný: Über Abbildungen von Mengen. Pac. Journ. Math. 13 (1963), 1359-1369. · Zbl 0137.25304 · doi:10.2140/pjm.1963.13.1359
[3] F. Hausdorff: Mengenlehre. Leipzig, 1914. · JFM 45.0123.01
[4] W. Sierpinski: Cardinal and ordinal numbers. Warszawa, 1958. · Zbl 0083.26803
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