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There is no fat orbit |
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| Authors: | Rod Downey Leo Harrington |
| Institution: | a Mathematics Department, Victoria University, P.O. Box 600, Wellington, New Zealand b Mathematics Department University of California, Berkeley, CA 94720, USA |
| Abstract: | We give a proof of a theorem of Harrington that there is no orbit of the lattice of recursively enumerable sets containing elements of each nonzero recursively enumerable degree. We also establish some degree theoretical extensions. |
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