Interesting Esoterica

There are not Exactly Five Objects

Article by Andreas Blass
  • Published in 1984
  • Added on
In the collection
The purpose of this note is to present a solution to a problem posed informally by A. Wilkie at the 1977 ASL meeting in Wrocław: Formulate "the cardinality of the universe is not exactly five" as a Horn sentence. Although this solution is not new -- I found it and M. Morley found another solution during the same meeting -- continuing sporadic inquiries about it suggest that its publication may be appropriate, even at this late date.

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journal
The Journal of Symbolic Logic

BibTeX entry

@article{TherearenotExactlyFiveObjects,
	title = {There are not Exactly Five Objects},
	author = {Andreas Blass},
	url = {https://www.jstor.org/stable/2274177?seq=1{\#}metadata{\_}info{\_}tab{\_}contents},
	urldate = {2020-09-21},
	year = 1984,
	abstract = {The purpose of this note is to present a solution to a problem posed informally by A. Wilkie at the 1977 ASL meeting in Wroc{\l}aw: Formulate "the cardinality of the universe is not exactly five" as a Horn sentence. Although this solution is not new -- I found it and M. Morley found another solution during the same meeting -- continuing sporadic inquiries about it suggest that its publication may be appropriate, even at this late date.},
	comment = {},
	journal = {The Journal of Symbolic Logic},
	collections = {attention-grabbing-titles}
}