Jc Beall: Logic of Christ | Who Shaves the Barber? #44

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Jc Beall

Christ is a walking contradiction. He is both fully human and fully divine. Indeed, he is both mutable and immutable. According to classical logic, the existence of a true contradiction would imply that everything is the case, no matter how absurd. And so, theologians and Christian metaphysicians have worked for centuries to conceptually make sense of Christ’s dual nature in a way that avoids contradiction.

Philosopher and logician Jc Beall argues that these efforts have been motivated by a naive understanding of logic. There are “subclassical” logics – that is, logics weaker than classical logic – in which contradictions do not entail every arbitrary conclusion. And these aren’t ad-hoc constructions. Beall argues that one subclassical logic – called First Degree Entailment (FDE) – is, in fact, the correct account of logical consequence, for reasons independent of the Christian problem. Beall covers the basics of how FDE works and why it is the universal or “basement-level” consequence relation. This allows us to have our cake and eat it too: we may take Christ to be, quite literally, both mutable and not mutable, at the same time and in the same respect. This isn’t just appealing for its simplicity. Beall suspects that it is essential to Christ’s role that he be literally contradictory.

If you’re interested in Jc Beall’s work and non-classical logic, check out my interview with Greg Restall (part 1 and part 2) on the book Logical Pluralism, co-authored by Beall and Restall.

Next week: Nicolas Langlitz: Psychedelics and Philosophy



Special thanks to Jackie Blum for the podcast art, and The Tin Box for the theme music.
Click here for the full list of episodes!

Topics discussed

0:20 – Intro to Jc Beall
1:20 – Spandrels of Truth
5:35 – Fundamental problem of Christology
16:23 – Explosion and disjunctive syllogism
25:06 – Other solutions to the fundamental problem
28:57 – Trinity and identity
31:37 – Logic, logical pluralism, and entailment
42:55 – Closure
46:08 – Consequence as “basement level” closure relation
53:19 – First Degree Entailment
1:03:50 – Are truth and falsity mutually exclusive?
1:10:01 – How weak can you go?
1:22:00 – Relevance to Christian practice


Jc Beall (homepage)
Christ – A Contradiction” (Jc Beall; forthcoming)
Theological Axioms and the Bounds of Logic: Christ as the Fundamental Problem” (Jc Beall)
Spandrels of Truth (Jc Beall)

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