{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,1]],"date-time":"2026-05-01T14:25:45Z","timestamp":1777645545161,"version":"3.51.4"},"reference-count":0,"publisher":"SAGE Publications","issue":"4","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["FI"],"published-print":{"date-parts":[[2021,6,30]]},"abstract":"<jats:p>For a given language L, we study the languages X such that for all distinct words u, v \u2208 L, there exists a word x \u2208 X that appears a different number of times as a factor in u and in v. In particular, we are interested in the following question: For which languages L does there exist a finite language X satisfying the above condition? We answer this question for all regular languages and for all sets of factors of infinite words.<\/jats:p>","DOI":"10.3233\/fi-2021-2047","type":"journal-article","created":{"date-parts":[[2021,7,3]],"date-time":"2021-07-03T04:40:54Z","timestamp":1625287254000},"page":"375-393","source":"Crossref","is-referenced-by-count":0,"title":["Separating the Words of a Language by Counting Factors"],"prefix":"10.1177","volume":"180","author":[{"given":"Aleksi","family":"Saarela","sequence":"first","affiliation":[{"name":"Department of Mathematics and Statistics, University of Turku, 20014 Turku, Finland. amsaar@utu.fi"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","container-title":["Fundamenta Informaticae"],"original-title":[],"link":[{"URL":"https:\/\/content.iospress.com\/download?id=10.3233\/FI-2021-2047","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T06:32:30Z","timestamp":1777444350000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.sagepub.com\/doi\/full\/10.3233\/FI-2021-2047"}},"subtitle":[],"editor":[{"given":"Micha\u0142","family":"Skrzypczak","sequence":"additional","affiliation":[],"role":[{"role":"editor","vocabulary":"crossref"}]},{"given":"Piotr","family":"Hofman","sequence":"additional","affiliation":[],"role":[{"role":"editor","vocabulary":"crossref"}]}],"short-title":[],"issued":{"date-parts":[[2021,6,30]]},"references-count":0,"journal-issue":{"issue":"4"},"URL":"https:\/\/doi.org\/10.3233\/fi-2021-2047","relation":{},"ISSN":["0169-2968","1875-8681"],"issn-type":[{"value":"0169-2968","type":"print"},{"value":"1875-8681","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,6,30]]}}}