𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Enumerating orientations of ordered sets

✍ Scribed by Wei-Ping Liu; Ivan Rival


Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
488 KB
Volume
88
Category
Article
ISSN
0012-365X

No coin nor oath required. For personal study only.


πŸ“œ SIMILAR VOLUMES


Coding in the Partial Order of Enumerabl
✍ Leo Harrington; AndrΓ© Nies πŸ“‚ Article πŸ“… 1998 πŸ› Elsevier Science 🌐 English βš– 489 KB

We develop methods for coding with first-order formulas into the partial order E of enumerable sets under inclusion. First we use them to reprove and generalize the (unpublished) result of the first author that the elementary theory of E has the same computational complexity as the theory of the nat

Sums of lexicographically ordered sets
✍ M.D. Atkinson; A. Negro; N. Santoro πŸ“‚ Article πŸ“… 1990 πŸ› Elsevier Science 🌐 English βš– 458 KB
The Index Set of Injectively Enumerable
✍ Stephan Wehner πŸ“‚ Article πŸ“… 1994 πŸ› John Wiley and Sons 🌐 English βš– 372 KB

## Abstract I introduce an effective enumeration of all effective enumerations of classes of r. e. sets and define with this the index set __IE__ of injectively enumerable classes. It is easy to see that this set is βˆ‘~5~ in the Arithmetical Hierarchy and I describe a proof for the βˆ‘~5~‐hardness of