Lexicon of Arguments

Philosophical and Scientific Issues in Dispute
 
[german]


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VII 160f
Truth/Provability/Langford: although the following schemes are in the quantifier provable, the corresponding rates are not logically true: (1) (Ex) (Fx v ~ Fx ) - (2) (x) Fx > (Ex) Fx - their truth depends on whether there is something that is referred to it, or whether the universe is not simply empty - QuineVs: analyticity says nothing about existence - QuineVs: Error: " Fa v ~ Fa " implies not logical "(Ex) (Fx v ~ Fx) " - although we accept that a logically true sentence is implied by any but Langford cannot do that - this takes the existential generalization - also VsLangford: from propositions that contain the meaning of "a" and "F" as constituents , one cannot derive existence - Likelihood of word and object - instead of the existence of objects one could simply assume the existence of the proposition - but meaning is not an "entity" - Langford/Quine: he is right when he concludes "a exists" from an atom sentence "Fa" , but not from " ~ Fa " - (( s ) separately.)

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