a1 University of Wisconsin, Department of Mathematics, Madison, WI 53706-1388, USA, E-mail: [email protected]
a2 Università Di Siena, Dipartimento Di Matematica, 1-53100 Siena, Italy, E-mail: [email protected]
We show that every finite lattice is embeddable into the Σ2 0 enumeration degrees via a lattice-theoretic embedding which preserves 0 and 1.
(Received October 02 2000)
† Partially supported by NSF grant DMS-9504474.
‡ Partially supported by MURST 60%.