Mathematics – Logic
Scientific paper
2009-01-30
Mathematics
Logic
Scientific paper
We exhibit canonical middle-inverse Choice maps within categorical (Free-Variable) Theory of Primitive Recursion as well as in Theory of partial PR maps over the Theory of Primitive Recursion with predicate abstraction. Using these choice-maps, defined by mu-recursion, we address the Consistency problem for a minimal Quantified extension Q of latter two theories: We prove, that Q's exists-defined mu-operator coincides on PR predicates with that inherited from theory of partial PR maps. We strengthen Theory Q by axiomatically forcing the lexicographical order on its omega^omega to become a well-order: "finite descent". Resulting theory admits non-infinit PR-iterative descent schema (pi) which constitutes Cartesian PR Theory piR introduced in RCF2: Evaluation and Consistency. A suitable Cartesian subSystem of Q + wo(omega^omega) above, extension of piR "inside" Theory Q + wo(omega^omega), is shown to admit code self-evaluation: extension of formally partial code evaluation of piR into a "total" self-evaluation for the subSystem. Appropriate diagonal argument then shows inconsistency of this subsystem and (hence) of its extensions Q + wo(omega^omega) and ZF.
Pfender Michael
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