Jump degrees of torsion-free abelian groups
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AbstractWe show, for each computable ordinal α and degree a > 0(α), the existence of a torsion-free abelian group with proper αth jump degree a.
1992 ◽
Vol 52
(2)
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pp. 219-236
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1989 ◽
Vol 39
(1)
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pp. 21-24
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1969 ◽
Vol 12
(4)
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pp. 475-478
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1969 ◽
Vol 12
(4)
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pp. 479-480
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2011 ◽
Vol 21
(08)
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pp. 1463-1472
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2000 ◽
Vol 20
(4)
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pp. 1111-1125
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