Encoding many-valued logic in $λ$-calculus
We will extend the well-known Church encoding of Boolean logic into $λ$-calculus to an encoding of McCarthy's $3$-valued logic into a suitable infinitary extension of $λ$-calculus that identifies all unsolvables by $\bot$, where $\bot$ is a fresh constant. This encoding refines to $n$-valued logic for $n\in\{4,5\}$. Such encodings also exist for Church's original $λ\mathbf{I}$-calculus. By way of motivation we consider Russell's paradox, exploiting the fact that the same encoding allows us also to calculate truth values of infinite closed propositions in this infinitary setting.
cs.LO↗