Abstract
The number of non-isomorphic posets on 13 elements is P13=33,823,827,452Footnote 1. This extends our previous result P12 which constituted the greatest known value. A table enumerates the posets according to their number of relations.
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Notes
An announcement of this result was sent to the Abstracts of the A.M.S. on July 4th, 1992.
References
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Communicated by I. Rival
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Chaunier, C., Lygerōs, N. The number of orders with thirteen elements. Order 9, 203–204 (1992). https://doi.org/10.1007/BF00383943
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DOI: https://doi.org/10.1007/BF00383943