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On pages 148-155 of Naming and Necessity, Saul Kripke reason his book by laying away an statement against type-type individuality theory ( the position that that any given psychological state is indistinguishable to a encephalon province ). Kripke reason that a psychological state ( hurting ) can not be indistinguishable to a encephalon province ( C-fiber stimulation ) because if the aforementioned provinces are indistinguishable, so they must be so necessarily; and since we can imagine one province bing without the other, they can not be indistinguishable. Beneath, I shall place awaily a general statement ( with explanatory inputs ) which exhibits the footing of Kripke 's reasoning then name Krikpe 's representative from the text ( too with explanatory inputs ).

1. If X is a stiff designator and Yttrium is a stiff designator, and if the statement `` Ten is indistinguishable to Y '' is true, so the statement `` 10 is indistinguishable to Yttrium '' is necessarily true.

An instance of the above is `` Clemens is indistinguishable to Samuel Clemens ''. Since both of these names are stiff designators, so `` Samuel langhorne clemens is indistinguishable to Samuel Clemens '' is true in every possible creation in which these stiff designators pick out an someone. Then again, the statement `` Samuel langhorne clemens is indistinguishable to the writer of The Adventures of Tom Sawyer '' is composed of the stiff designator `` Samuel langhorne clemens '' and the nonrigid designator `` the writer of The Adventures of Tom Sawyer ''. While these two designators may be indistinguishable in the existent universe, it is possible that somebody else could hold composed The Adventures of Tom Sawyer. Thence, the latter representative of individuality is not necessary.

2. Ten is a stiff designator.

3. Yttrium is a stiff designator.

4. Stillly, `` Tenner is indistinguishable to Y '' is not necessarily true.

5. Hence, `` Ten is indistinguishable to Y '' is not true.

Below is a Reconstruction of Kripke 's specific representative regarding `` hurting '' and `` C-fiber stimulation '':

1. If `` hurting '' is a stiff designator and `` C-fiber stimulation '' is a stiff designator, so the statement `` hurting is indistinguishable to C-fiber stimulation '' is necessarily true.

Kripke expects that some people will object that the individuality statement above can not be necessary since it is cognise a posteriori. Notwithstanding, Kripke shows out that the statement `` hurting is indistinguishable to C-fiber stimulation '' is correspondent to other necessary individuality statements that are cognized a posteriori such as `` H2O is indistinguishable to H2O '' or `` heat is indistinguishable to molecular gesture ''. Besides this, Kripke demoes earlily ( pp. 35-37 ) that some necessary truths are cognise a posteriori ( like certain mathematical proofs that necessitate a mass of computation ).

2. `` Hurting '' is a stiff designator.

Again Kripke expects expostulations to the above assumption. He maintains that `` hurting '' is a stiff designator because it picks out what it mentions to by an indispensable belongings ( the aesthesis of pain ). It is impossible to envisage hurting bing without the belongings of `` experiencing painful ''.

3. `` C-fiber stimulation '' is a stiff designator.

4. Nonetheless, `` hurting is indistinguishable to C-fiber stimulation '' is not necessarily true.

It is possible to ideate a universe in which one can be without the other.

5. Hence, `` hurting is indistinguishable to C-fiber stimulation '' is not true.

I must fink that the above statement looks to be a powerful defense of individuality theory. It looks to me that the only exit of the determination is to either deny Krikpe 's semantics or reason convincingly that either `` hurting '' or `` C-fiber stimulation '' or both are not stiff designators.

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