Computer Science Logic
Computer Science Logic
复制标题
计算机科学逻辑
DOI:
10.1007/978-3-642-15205-4_34
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发表时间:
2010
期刊:
影响因子:
--
通讯作者:
Nenov Y
中科院分区:
文献类型:
--
作者:
Nenov Y
By aEuclidean logic, we understand a formal language whose variables range over subsets of Euclidean space, of some fixed dimension, and whose non-logical primitives have fixed meanings as geometrical properties, relations and operations involving those sets. In this paper, we consider first-order Euclidean logics with primitives for the properties ofconnectednessandconvexity, the binary relation ofcontactand the ternary relation ofbeing closer-than. We investigate the computational properties of the corresponding first-order theories when variables are taken to range over various collections of subsets of 1-, 2- and 3-dimensional space. We show that the theories based on Euclidean spaces of dimension greater than 1 can all encode either first- or second-order arithmetic, and hence are undecidable. We show that, for logics able to express thecloser-thanrelation, the theories of structures based on 1-dimensional Euclidean space have the same complexities as their higher-dimensional counterparts. By contrast, in the absence of thecloser-thanpredicate, all of the theories based on 1-dimensional Euclidean space considered here are decidable, but non-elementary.
影响因子:
0.5
作者:
J. Girard
通讯作者:
J. Girard
DOI:
--
发表时间:
1989
期刊:
ACM-SIGACT Symposium on Principles of Programming Languages
影响因子:
--
作者:
T. Griffin
通讯作者:
T. Griffin