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Journal of Logic and Computation Advance Access originally published online on August 22, 2008
Journal of Logic and Computation 2009 19(1):175-176; doi:10.1093/logcom/exn022
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© The Author, 2008. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

This article appears in the following Journal of Logic and Computation issue: Special Issue: Logic and Computation in the Real World: CiE 2007 [View the issue table of contents]

Original Articles

Infinite Computations and a Hierarchy in {Delta}3 Reconsidered

Branislav Rovan and L'uboS Steskal

Department of Computer Science, Faculty of Mathematics Physics and Informatics, Comenius University, 84248 Bratislava, Slovakia
E-mail: steskal{at}dcs.fmph.uniba.sk; rovan{at}dcs.fmph.uniba.sk

Received 1 October 2007.


  Abstract

In this note, we reconsider the results in Rovan and Steskal (2007, Vol. 4497 of Lecture Notes in Computer Science, pp. 660–669, Springer) concerning TMDC (Display Turing Machines with Control) with Chomsky like control language. We shall show that, under the given assumptions, various degrees of the control complexity do not give rise to a hierarchy of language families, thus correcting an error in Rovan and Steskal (2007, Vol. 4497 of Lecture Notes in Computer Science, pp. 660–669, Springer).


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