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Twenty-Second Annual IEEE Conference on Computational Complexity (CCC'07)   pp. 217-221
Directed Planar Reachability is in Unambiguous Log-Space

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DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/CCC.2007.9
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Abstract
We show that the st-connectivity problem for directed planar graphs can be decided in unambiguous logarithmic space.
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Citation:  1 Bourke, 1 Tewari, 1 Vinodchandran, "Directed Planar Reachability is in Unambiguous Log-Space," ccc, pp. 217-221,  Twenty-Second Annual IEEE Conference on Computational Complexity (CCC'07),  2007

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