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[9] Grzegorz Bancerek. The ordinal numbers. Formalized Mathematics, 1(1):91-96, 1990.Google Scholar

[10] Grzegorz Bancerek. König’s lemma. Formalized Mathematics, 2(3):397-402, 1991. Google Scholar

[11] Grzegorz Bancerek. Joining of decorated trees. Formalized Mathematics, 4(1):77-82, 1993.Google Scholar

[12] Grzegorz Bancerek. Directed sets, nets, ideals, filters, and maps. Formalized Mathematics, 6(1):93-107, 1997.Google Scholar

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[14] Grzegorz Bancerek and Artur Korniłowicz. Yet another construction of free algebra. Formalized Mathematics, 9(4):779-785, 2001.Google Scholar

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[27] Takashi Mitsuishi and Grzegorz Bancerek. Lattice of fuzzy sets. Formalized Mathematics, 11(4):393-398, 2003.Google Scholar

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[36] Zinaida Trybulec. Properties of subsets. Formalized Mathematics, 1(1):67-71, 1990.Google Scholar

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