nLab1/1/2011

limited principle of omniscience

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basic constructions: strong axioms further constructive mathematics, realizability, computability propositions as types, proofs as programs, computational trinitarianism The limited principle of omniscience () states that the existential quantification of any decidable proposition is again decidable. That is, or equivalently We have not stated the domain of quantification of the variable . If you take it to be the subsingleton corresponding to a given truth value and apply this principle to the.