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Department: Any ÅAU / Department of Information Technologies UTU / Department of Information Technology UTU / Department of Mathematics and Statistics UTU / Turku School of Economics, Institute of Information Systems Sciences

Research Unit: Any Algorithmics and Computational Intelligence Group (ACI) Biomathematics Research Unit (BIOMATH) Communication Systems (ComSys) Computational Biomodeling Laboratory (Combio Lab) Data Mining and Knowledge Management Laboratory Distributed Systems Laboratory (DS Lab) Embedded Computer and Electronic Systems (ECES) Embedded Systems Laboratory (ESLAB) FUNDIM, Fundamentals of Computing and Discrete Mathematics Institute for Advanced Management Systems Research (IAMSR) Learning and Reasoning Lab Software Construction Laboratorium Software Development Laboratory (SwDev) Software Engineering Laboratory (SE Lab) Turku BioNLP Group Turku Optimization Group (TOpGroup) UTU Information Systems Science (ISS)

Publication type: Any Monographs Edited books Edited special issues of journals Edited proceedings Articles in journals Articles in proceedings Chapters in edited books Ph.D. thesis Lic. thesis Technical reports

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Articles in journals (2):

• Tommi Lehtinen, Alexander Okhotin, On Equations Over Sets of Numbers and Their Limitations. International Journal of Foundations of Computer Science 22(2), 377–393, 2011.
• Tommi Lehtinen, Alexander Okhotin, Boolean Grammars and gsm Mappings. International Journal of Foundations of Computer Science , 2010.

Articles in proceedings (3):

• Tommi Lehtinen, Alexander Okhotin, On Language Equations XXK=XXL and XM=N Over a Unary Alphabet. In: 2010.
• Tommi Lehtinen, Alexander Okhotin, On Equations over Sets of Numbers and their Limitations. In: Developments in Language Theory 2009, LNCS, 360-371, Springer, 2009.
• Tommi Lehtinen, Alexander Okhotin, Boolean grammars and gsm mappings. In: Automat and Formal Languages. The 12th International Conference, AFL 2008, Balatonfüred, Hungary, May 27-30, 2008, Proceedings., 2008.

Ph.D. thesis (1):

• Tommi J. M. Lehtinen, Numbers and Languages. TUCS Dissertations 158. University of Turku, 2013.

Technical reports (3):

• Tommi Lehtinen, Alexander Okhotin, On Equations X+X+C=X+X+D and X+E=F with Unknown X Subseteq N. TUCS Technical Reports 952, Turku Centre for Computer Science, 2009.
• Tommi Lehtinen, Alexander Okhotin, Boolean Grammars Are Closed Under Inverse Gsm Mappings. TUCS Technical Reports 911, Turku Centre for Computer Science, 2008.
• Tommi Lehtinen, Alexander Okhotin, Boolean grammars are closed under inverse homomorphisms. TUCS Technical Reports 846, Turku Centre for Computer Science, 2007.