Entailment accounts thus smuggle in contested metaphysical theses—such as Fregean concept-realism—disguising first-order ontological disputes as matters of mere logical consequence.
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first-order(describes the type of existence claims being discussed)
A way of talking about things directly as they are, without stepping back to talk about the rules or assumptions underlying our talk—like saying 'the cat is on the mat' instead of discussing how language describes spatial relationships.
logical consequence(WL II, 391–395; noted as similar to Tarski 1956, 419)
A proposition s is a logical consequence of a set of premises σ if and only if s follows from σ with respect to the sequence of all extra-logical simple ideas contained in σ or s.
metaphysical(Ayer's Logical Positivist usage)
Language that purports to refer beyond the physical world and lacks empirical consequences, which Ayer classifies as not literally significant
smuggle in(as a way of describing hidden assumptions)
To introduce an idea or assumption into an argument without openly stating it or proving it deserves to be there.