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IJAC
2010
128views more  IJAC 2010»
13 years 6 months ago
Compressed Words and Automorphisms in Fully Residually Free Groups
We show that the compressed word problem in a finitely generated fully residually free group (F-group) is decidable in polynomial time, and use this result to show that the word ...
Jeremy MacDonald
POPL
2002
ACM
14 years 8 months ago
The first-order theory of subtyping constraints
We investigate the first-order theory of subtyping constraints. We show that the first-order theory of nonstructural subtyping is undecidable, and we show that in the case where a...
Zhendong Su, Alexander Aiken, Joachim Niehren, Tim...
DAGSTUHL
2007
13 years 9 months ago
Directed Feedback Vertex Set Problem is FPT
To decide if the parameterized feedback vertex set problem in directed graph is fixed-parameter tractable is a long standing open problem. In this paper, we prove that the paramet...
Jianer Chen, Yang Liu 0002, Songjian Lu
ENDM
2007
64views more  ENDM 2007»
13 years 7 months ago
The complexity of the Weight Problem for permutation groups
Given a metric d on a permutation group G, the corresponding weight problem is to decide whether there exists an element g ∈ G such that d(g, e) = k for some k ∈ N. In this pa...
Peter J. Cameron, Taoyang Wu
IANDC
2008
213views more  IANDC 2008»
13 years 7 months ago
Decision problem for shuffled genes
We consider a permutation-based model for the gene assembly process in ciliates. We give a procedure to decide whether a given micronuclear molecules may be assembled by using onl...
Ion Petre, Vladimir Rogojin