Abstract
We give an example of an ordered set P which contains a 2-element antichain that is not contained in any finite retract of P.
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Duffus D., Rival I., Simonovits M.: Spanning retracts of a Partially Ordered Set. Discr. Math. 32, 1–7 (1980)
Schröder B.: Ordered Sets—An Introduction. Birkhäuser, Boston–Basel–Berlin (2003)
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Presented by M. Haviar.
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Open Access This is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (https://creativecommons.org/licenses/by-nc/2.0), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
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Kukieła, M., Schröder, B.S.W. A 2-element antichain that is not contained in any finite retract. Algebra Univers. 67, 59–62 (2012). https://doi.org/10.1007/s00012-012-0169-0
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DOI: https://doi.org/10.1007/s00012-012-0169-0