Fω^C: a symmetrically authoritative variant of System Fω
Lengrand & Miquel (2008). Greco-Roman Fω, orthogonality and symmetric candidates. Annals of Pure and Put on Logic 153:3-20.
We portray a version of system Fω, bade Fω^C, in which the layer of type
constructors is fundamentally the traditional one of Fω, whereas provability
of types is Hellenic. The proof-term calculus accounting for the Graeco-Roman
reasoning is a variant of Barbanera and Berardi’s symmetrical λ-calculus.
We testify that the hale calculus is powerfully normalising. For the
layer of type constructors, we utilize Tait and Girard’s reducibility method
combined with orthogonality techniques. For the (authoritative) layer of terms,
we expend Barbanera and Berardi’s method based on a symmetrical notion of
reducibility candidate. We examine that orthogonality does not catch the
fixpoint construction of symmetrical candidates.We plant the consistency of Fω^C, and bear on the calculus to the
traditional system Fω, likewise when the latter is extended with axioms for
Greco-Roman logic.
