Weakly Precomplete Equivalence Relations in the Ershov Hierarchy
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DOI: 10.1007/s10469-019-09538-y
Abstract: We study the computable reducibility ≤c for equivalence relations in the Ershov hierarchy. For an arbitrary notation a for a nonzero computable ordinal, it is stated that there exist a $$ {\varPi}_a^{-1} $$ -universal equivalence… read more here.
Keywords: weakly precomplete; equivalence; equivalence relations; relations ershov ... See more keywords
Parameter reductions of soft equivalence relations
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DOI: 10.1007/s13042-015-0470-2
Abstract: In this paper, the facts that every equivalence relation may be considered as a special case of soft equivalence relations and there exists a one-to-one correspondence between the family of all knowledge bases and the… read more here.
Keywords: parameter reductions; equivalence; soft equivalence; reductions soft ... See more keywords
Rogers Semilattices for Families of Equivalence Relations in the Ershov Hierarchy
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DOI: 10.1134/s0037446619020046
Abstract: The paper studies Rogers semilattices for families of equivalence relations in the Ershov hierarchy. For an arbitrary notation a of a nonzero computable ordinal, we consider $$\sum\nolimits_a^{- 1} {}$$∑a−1-computable numberings of the family of all… read more here.
Keywords: equivalence relations; rogers semilattices; ershov hierarchy; semilattices families ... See more keywords
Water needs and equivalence relations for different irrigated crops in the São Francisco basin
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DOI: 10.5935/1806-6690.20180046
Abstract: The present work was performed by applying the principal component analysis, in order to compare the water needs of banana, mango, grape, sugarcane, maize and beans crops in different regions of the Sao Francisco river… read more here.
Keywords: francisco basin; water needs; needs equivalence; water ... See more keywords