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Published online by Cambridge University Press: 12 March 2014
We shall present two novel ways of deriving simply typed combinatory models. These are of interest in a constructive setting. First we look at extension models, which are certain subalgebras of full function space models. Then we shall show how the space of singletons of a combinatory model can itself be made into one. The two and the algebras in between will have many common features. We use these two constructions in proving:
There is a model of constructive set theory in which every closed extensional theory of simply typed combinatory logic is the theory of a full function space model.