There is no low maximal d. c. e. degree - CorrigendumWe give a corrected proof of an extension of the Robinson Splitting Theorem for the d.
c.
e On downey's conjectureWe prove that the degree structures of the d.
c.e. and the 3-
c.e. Turing degrees
Elementary differences between the (2p)-C. E. and the (2p + 1)-C. E. enumeration degreesIt is proved that the (2p)-
c.
e.
e-degrees are not elementarily equivalent to the (2p + 1)-
c.
e.
e