On the complexity of finding paths in a two‐dimensional domain I: Shortest paths

Mathematical Logic Quarterly 50 (6):551-572 (2004)

Abstract
The computational complexity of finding a shortest path in a two-dimensional domain is studied in the Turing machine-based computational model and in the discrete complexity theory. This problem is studied with respect to two formulations of polynomial-time computable two-dimensional domains: domains with polynomialtime computable boundaries, and polynomial-time recognizable domains with polynomial-time computable distance functions. It is proved that the shortest path problem has the polynomial-space upper bound for domains of both type and type ; and it has a polynomial-space lower bound for the domains of type , and has a #P lower bound for the domains of type
Keywords computational complexity  polynmial space  polynomial time  Shortest path
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DOI 10.1002/malq.200310120
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