{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,29]],"date-time":"2026-03-29T15:19:55Z","timestamp":1774797595425,"version":"3.50.1"},"reference-count":29,"publisher":"World Scientific Pub Co Pte Lt","issue":"04","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Int. J. Found. Comput. Sci."],"published-print":{"date-parts":[[2003,8]]},"abstract":"<jats:p> We show that it is undecidable whether or not two finite substitutions are equivalent on the fixed regular language ab*c. This gives an unexpected answer to a question proposed in 1985 by Culik II and Karhum\u00e4ki. At the same time it can be seen as the final result in a series of undecidability results for finite transducers initiated in 1968 by Griffiths. 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P.","family":"Lisovik","sequence":"additional","affiliation":[{"name":"Department of Cybernetics, Kiev National University, Kiev, 252017, Ukraine"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"219","published-online":{"date-parts":[[2011,11,20]]},"reference":[{"key":"rf1","doi-asserted-by":"publisher","DOI":"10.1016\/0304-3975(85)90066-0"},{"key":"rf2","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-663-09367-1"},{"key":"rf3","doi-asserted-by":"publisher","DOI":"10.1016\/S0022-0000(73)80045-5"},{"key":"rf4","doi-asserted-by":"publisher","DOI":"10.1016\/0012-365X(83)90152-8"},{"key":"rf5","doi-asserted-by":"publisher","DOI":"10.1016\/0304-3975(86)90134-9"},{"key":"rf6","doi-asserted-by":"publisher","DOI":"10.1016\/0304-3975(78)90020-8"},{"key":"rf7","doi-asserted-by":"publisher","DOI":"10.1145\/321466.321473"},{"key":"rf8","doi-asserted-by":"publisher","DOI":"10.1007\/BF01744569"},{"key":"rf9","first-page":"321","volume":"40","author":"Guba V. 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