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Decidability Versus Undecidability of the Word Problem in Amalgams of Inverse Semigroups

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Semigroups, Algebras and Operator Theory

Part of the book series: Springer Proceedings in Mathematics & Statistics ((PROMS,volume 142))

Abstract

This paper is a survey of some recent results on the word problem for amalgams of inverse semigroups. Some decidability results for special types of amalgams are summarized pointing out where and how the conditions posed on amalgams are used to guarantee the decidability of the word problem. Then a recent result on undecidability is shortly illustrated to show how small is the room between decidability and undecidability of the word problem in amalgams of inverse semigroups.

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Acknowledgments

The first author is grateful to the organizers of ICSAOT 2014 for inviting her to present these results and acknowledges support from PRIN project 2011 “Automi e Linguaggi Formali: Aspetti Matematici e Applicativi.” The last author acknowledges support from the European Regional Development Fund through the programme COMPETE and by the Portuguese Government through the FCT—Fundação para a Ciência e a Tecnologia under the project PEst-C/MAT/UI0144/2013 as well as support from the FCT project SFRH/BPD/65428/2009.

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Correspondence to Alessandra Cherubini .

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Cherubini, A., Rodaro, E. (2015). Decidability Versus Undecidability of the Word Problem in Amalgams of Inverse Semigroups. In: Romeo, P., Meakin, J., Rajan, A. (eds) Semigroups, Algebras and Operator Theory. Springer Proceedings in Mathematics & Statistics, vol 142. Springer, New Delhi. https://doi.org/10.1007/978-81-322-2488-4_1

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