The Meaning Of Intension In Hilary Putnam's Externalism

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At the background of Hilary Putnam’s externalism is the opposing philosophical descriptive assumption that meaning in the sense of extension is determined by intension. This contention comes out clearly in the typical example of finding out the meaning of natural kind in which the compound terms ‘creatures with a heart’ and ‘creatures with a kidney’ differ considerably though having the same extensions because there is in another sense in which the meaning of these terms is not its extensions but something other that it, what is normally referred to as intension of the term. The two terms have different intensions (Carnap, 1974) or sense (Frege, 1872). One can understand this intension as the descriptions associated with a term. It is under this purview that traditional philosophers such as Frege and Carnap have come to see the meaning of terms (hence intensions or concepts) not in the sense of psychologism as mental entities but in terms of ‘abstract entities’ which after all did not escape the psychological act it rebelled against. …show more content…

He imagines a doppelgänger for the Earth, a Twin Earth as exact duplicates – to the last molecules and same behavioural constitutions - for both the Earthlings and the Twin Earthlings. By the time a space ship landed in the Twin Earth (and subsequently on Earth) there is a difference in the term ‘water’ on earth and Twin Earth, consisting of H2O and XYZ respectively and thereby applying to different things. This difference did not affect the usage of this liquids in the two planets, despite their different hidden structure. Right even at the time in 1750 when there was no expertise and specialist knowledge of chemical properties of water and the hidden structure of water in earth and Twin earth, when the inhabitants of both earth use the term water in both planets, they referred still differently to the liquid made of H20 and XYZ

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