RANK LOGIC IS DEAD, LONG LIVE RANK LOGIC!
RANK LOGIC IS DEAD, LONG LIVE RANK LOGIC!
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等级逻辑已死,等级逻辑万岁!
DOI:
10.1017/jsl.2018.33
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Wied Pakusa
中科院分区:
文献类型:
--
作者:
Grädel;Wied Pakusa
Motivated by the search for a logic for polynomial time, we study rank logic (FPR) which extends fixed-point logic with counting (FPC) by operators that determine the rank of matrices over finite fields. While FPR can express most of the known queries that separate FPC from Ptime, almost nothing was known about the limitations of its expressive power.In our first main result we show that the extensions of FPC by rank operators over different prime fields are incomparable. This solves an open question posed by Dawar and Holm and also implies that rank logic, in its original definition with a distinct rank operator for every field, fails to capture polynomial time. In particular we show that the variant of rank logic with an operator that uniformly expresses the matrix rank over finite fields is more expressive than FPR.One important step in our proof is to consider solvability logic FPS which is the analogous extension of FPC by quantifiers which express the solvability problem for linear equation systems over finite fields. Solvability logic can easily be embedded into rank logic, but it is open whether it is a strict fragment. In our second main result we give a partial answer to this question: in the absence of counting, rank operators are strictly more expressive than solvability quantifiers.
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DOI:
10.1007/978-3-662-44522-8_5
发表时间:
2014
期刊:
ArXiv
影响因子:
--
作者:
Faried Abu Zaid;E. Grädel;Martin Grohe;Wied Pakusa
通讯作者:
Wied Pakusa
DOI:
10.1016/s0020-0190(00)00091-0
发表时间:
2000
期刊:
Inf. Process. Lett.
影响因子:
--
作者:
U. Hertrampf;S. Reith;H. Vollmer
通讯作者:
H. Vollmer
DOI:
10.1007/bfb0020812
发表时间:
1991
期刊:
Artif. Intell.
影响因子:
--
作者:
G. Buntrock;C. Damm;U. Hertrampf;C. Meinel
通讯作者:
C. Meinel
DOI:
--
发表时间:
1997
期刊:
Lecture Notes in Logic
影响因子:
--
作者:
M. Otto
通讯作者:
M. Otto
DOI:
--
发表时间:
2012
期刊:
Log. Methods Comput. Sci.
影响因子:
--
作者:
A. Dawar;E. Grädel;Bjarki Holm;Eryk Kopczynski;Wied Pakusa
通讯作者:
Wied Pakusa