A Note on Absolutely Unorderable Combinatory Algebras

Authors: Lusin S.1; Salibra A.1

Source: Journal of Logic and Computation, Volume 13, Number 4, August 2003 , pp. 481-502(22)

Publisher: Oxford University Press

Abstract:

Plotkin has conjectured that there exists an absolutely unorderable combinatory algebra, namely a combinatory algebra which cannot be embedded in another combinatory algebra admitting a nontrivial compatible partial order. In this paper we prove that a wide class of combinatory algebras admits extensions with a nontrivial compatible partial order.

Document Type: Original article

Affiliations: 1: Dipartimento di Informatica, Università Ca'Foscari di Venezia, Via Torino 155, 30172 Venezia, Italy. , salibra@dsi.unive.it

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