Abstract
In 2010, Gábor Czédli and E. Tamás Schmidt mentioned that the best cover-preserving embedding of a given semimodular lattice is not known yet [A cover-preserving embedding of semimodular lattices into geometric lattices. Advances in Mathematics, 225, 2455–2463 (2010)]. That is to say: What are the geometric lattices G such that a given finite semimodular lattice L has a cover-preserving embedding into G with the smallest ∣G∣? In this paper, we propose an algorithm to calculate all the best extending cover-preserving geometric lattices G of a given semimodular lattice L and prove that the length and the number of atoms of every best extending cover-preserving geometric lattice G equal the length of L and the number of non-zero join-irreducible elements of L, respectively. Therefore, we solve the problem on the best cover-preserving embedding of a given semimodular lattice raised by Gábor Czédli and E. Tamás Schmidt.
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Supported by the National Natural Science Foundation of China (Grant Nos. 11901064 and 12071325)
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He, P., Wang, X.P. The Best Extending Cover-preserving Geometric Lattices of Semimodular Lattices. Acta. Math. Sin.-English Ser. 39, 1369–1388 (2023). https://doi.org/10.1007/s10114-023-1531-1
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DOI: https://doi.org/10.1007/s10114-023-1531-1