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CIE
2006
Springer
13 years 9 months ago
Undecidability in the Homomorphic Quasiorder of Finite Labeled Forests
Abstract. We prove that the homomorphic quasiorder of finite k-labeled forests has undecidable elementary theory for k 3, in contrast to the known decidability result for k = 2. W...
Oleg V. Kudinov, Victor L. Selivanov
CIE
2007
Springer
13 years 9 months ago
Definability in the Homomorphic Quasiorder of Finite Labeled Forests
Abstract. We prove that for any k 3 each element of the homomorphic quasiorder of finite k-labeled forests is definable, provided that the minimal non-smallest elements are allowe...
Oleg V. Kudinov, Victor L. Selivanov