Descriptive Complexity of #AC0 Functions
Descriptive Complexity of #AC0 Functions
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描述的复杂性
DOI:
10.1016/j.jcss.2020.04.002
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
H. Vollmer
中科院分区:
文献类型:
--
作者:
A. Durand;A. Haak;J. Kontinen;H. Vollmer
We introduce a new framework for a descriptive complexity approach to arithmetic computations. We define a hierarchy of classes based on the idea of counting assignments to free function variables in first-order formulae. We completely determine the inclusion structure and show that #P and #AC^0 appear as classes of this hierarchy. In this way, we unconditionally place #AC^0 properly in a strict hierarchy of arithmetic classes within #P. We compare our classes with a hierarchy within #P defined in a model-theoretic way by Saluja et al. We argue that our approach is better suited to study arithmetic circuit classes such as #AC^0 which can be descriptively characterized as a class in our framework.
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