Journal of Logic and Computation Advance Access originally published online on August 6, 2008
Journal of Logic and Computation 2008 18(6):1029-1045; doi:10.1093/logcom/exn034
Original Articles |
On Dynamic Topological Logic of the Real Line
Department of Mathematics, California State University, Fresno 5245 N Backer Ave, M/S PB 108 Fresno, CA 93740, USA.
E-mail: mnogin{at}csufresno.edu
HRL Laboratories, LLC, 3011 Malibu Canyon Rd, Malibu, CA 90265, USA.
E-mail: anogin{at}hrl.com
Received 20 May 2008.
This article explores the topological interpretations of the modal language with two modalities—
, which is interpreted as the interior operation and
(next) which is interpreted as the pre-image operation for a continuous function. It is known that the 
logic S4C is complete with respect to topological interpretations in
n for n
2, yet it is incomplete with respect to topological interpretations in
. We focus on the logic 

(
) of all the 
formulas that are sound with respect to topological interpretations in
. In this article we present two formulas in 

(
)–S4C, and prove that they are sound in
and independent. We also establish that the previously known examples of formulas in 

(
)–S4C are instances of a particular consequence of one of the two formulas presented.
Keywords: Dynamic topological logic; dynamic modal logic; S4C
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