Open ceilican opened 8 years ago
Beth, Evert W., 1955. "Semantic entailment and formal derivability", Mededelingen van de Koninklijke Nederlandse Akademie van Wetenschappen, Afdeling Letterkunde, N.R. Vol 18, no 13, 1955, pp 309–42
This was suggested by Valeria de Paiva
During the EPS event in TABLEAUX 2017, an entry on Smullyan's tableaux was suggested. Check if it is the same as the one in the reference above.
Beth, Evert W., 1955. "Semantic entailment and formal derivability", Mededelingen van de Koninklijke Nederlandse Akademie van Wetenschappen, Afdeling Letterkunde, N.R. Vol 18, no 13, 1955, pp 309–42