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location | Wellington, New Zealand | |
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visits | member for | 4 years, 5 months |
seen | Sep 28 '13 at 1:40 | |
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Mar 25 |
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Feb 10 |
comment |
Cohesive sets with degree below some non-high 1-generic degrees?
No but this is not so difficult. Fix a functional $\Phi$, define $W$ by adding any string $\sigma$ such that for some $n$, $\varphi_n(n)\downarrow$ and $\Phi^\sigma(n) \ne \varphi_n(n)$. If $G$ is 1-generic and $G$ meets $W$ the $\Phi^G$ is not DNC, if $G$ avoids $W$ (say at $\sigma$) then $\Phi^G$ cannot be total (otherwise build a computable DNC by looking at convergences compatible with $\sigma$). |
Feb 9 |
answered | Cohesive sets with degree below some non-high 1-generic degrees? |
Aug 14 |
answered | Completeness, easiest, hardest problems |
Aug 10 |
awarded | Supporter |
Aug 10 |
awarded | Teacher |
Aug 10 |
answered | Differentiability of computable functions |