|Publication ahead of print|
RAIRO-Theor. Inf. Appl.
|Published online||13 February 2018|
On avoidability of formulas with reversal☆
Department of Mathematics and Statistics, University of Winnipeg,
* Corresponding author: firstname.lastname@example.org
Accepted: 1 December 2017
While a characterization of unavoidable formulas (without reversal) is well-known, little is known about the avoidability of formulas with reversal in general. In this article, we characterize the unavoidable formulas with reversal that have at most two one-way variables (x is a one-way variable in formula with reversal ϕ if exactly one of x and xR appears in ϕ).
Mathematics Subject Classification: 68R15
Key words: Pattern avoidance / formula with reversal / unavoidability
© EDP Sciences, 2018
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