Slingshot argument


In philosophical logic, a slingshot argument is one of a group of arguments claiming to show that all true sentences stand for the same thing.
This type of argument was dubbed the "slingshot" by philosophers Jon Barwise and John Perry due to its disarming simplicity. It is usually said that versions of the slingshot argument have been given by Gottlob Frege, Alonzo Church, W. V. Quine, and Donald Davidson. However, it has been disputed by Lorenz Krüger that there is much unity in this tradition. Moreover, Krüger rejects Davidson's claim that the argument can refute the correspondence theory of truth. Stephen Neale claims, controversially, that the most compelling version was suggested by Kurt Gödel.
These arguments are sometimes modified to support the alternative, and evidently stronger, conclusion that there is only one fact, or one true proposition, state of affairs, truth condition, truthmaker, and so on.

The argument

One version of the argument proceeds as follows.
Assumptions:
  1. Substitution. If two terms designate the same thing, then substituting one for another in a sentence does not change the designation of that sentence.
  2. Redistribution. Rearranging the parts of a sentence does not change the designation of that sentence, provided the truth conditions of the sentence do not change.
  3. Every sentence is equivalent to a sentence of the form F. In other words, every sentence has the same designation as some sentence that attributes a property to something.
  4. For any two objects there is a relation that holds uniquely between them.
Let S and T be arbitrary true sentences, designating Des and Des, respectively. and Des It is now shown by a series of designation-preserving transformations that Des = Des. Here, "" can be read as "the x such that".
Note that - is not a derivation of T from S. Rather, it is a series of designation-preserving transformation steps.

Responses to the argument

As Gödel observed, the slingshot argument does not go through if Bertrand Russell's famous account of definite descriptions is assumed. Russell claimed that the proper logical interpretation of a sentence of the form "The F is G" is:
Or, in the language of first-order logic:
When the sentences above containing -expressions are expanded out to their proper form, the steps involving substitution are seen to be illegitimate. Consider, for example, the move from to. On Russell's account, and are shorthand for:
Clearly the substitution principle and assumption 4 do not license the move from to. Thus, one way to look at the slingshot is as simply another argument in favor of Russell's theory of definite descriptions.
If one is not willing to accept Russell's theory, then it seems wise to challenge either substitution or redistribution, which seem to be the other weakest points in the argument. Perry, for example, rejects both of these principles, proposing to replace them with certain weaker, qualified versions that do not allow the slingshot argument to go through.
Gaetano Licata rejected the slingshot argument, showing that the concept of identity employed in Davidson and Gödel's demonstration is very problematic, because Gödel uses the G. W. Leibniz's principle of the identity of indiscernibles, which suffer from the criticism proposed by Ludwig Wittgenstein: to state that x=y when all properties of x are also properties of y is false because y and x are different signs, while to state that x=x when all properties of x are also properties of x is a nonsense. Licata's thesis is that the sign = needs a logical foundation before being employed between objects and properties.