In linguistics , logic , philosophy , and other fields, an INTENSION is any property or quality connoted by a word , phrase , or another symbol. In the case of a word, the word's definition often implies an intension. For instance, intension of the word 'plant ' includes properties like "being composed of cellulose " and "alive" and "organism", among others. _Comprehension _ is the collection of all such intensions.
The meaning of a word can be thought of as the bond between the _idea the word means_ and the _physical form of the word_. Swiss linguist Ferdinand de Saussure (1857–1913) contrasts three concepts:
* the _signifier_ – the "sound image" or the string of letters on a page that one recognizes as the form of a sign * the _signified_ – the meaning, the concept or idea that a sign expresses or evokes * the _referent_ – the actual thing or set of things a sign refers to. See _Dyadic signs _ and _Reference (semantics) _.
Without intension of some sort, a word has no meaning. For instance, the terms 'rantans' or 'brillig ' have no intension and hence no meaning. Such terms may be suggestive, but a term can be _suggestive_ without being meaningful. For instance, 'ran tan' is an archaic onomatopoeia for chaotic noise or din and may suggest to English speakers a din or meaningless noise, and 'brillig' though made up by Lewis Caroll may be suggestive of 'brilliant' or 'frigid'. Such terms, it may be argued, are always intensional since they connote the property 'meaningless term' but this paradox does not constitute a counterexample to the claim that without intension a word has no meaning.
Intension is analogous to the signified in the Saussurean system, extension to the referent.
In philosophical arguments about dualism versus monism , it is noted that thoughts have intensionality and physical objects do not (S. E. Palmer, 1999), but rather have extension in space and time.
* 1 Statement forms
* 1.1 Intensional statement form
* 1.1.1 Examples
* 1.2 Extensional statement form
* 1.2.1 Examples
* 1.3 Significance
* 2 See also * 3 Notes * 4 References * 5 External links
A statement-form is simply a form obtained by putting blanks into a sentence where one or more expressions with extensions occur—for instance, "The quick brown ___ jumped over the lazy ___'s back." An instance of the form is a statement obtained by filling the blanks in.
INTENSIONAL STATEMENT FORM
An _intensional statement-form_ is a statement-form with at least one instance such that substituting co-extensive expressions into it does not always preserve logical value . An _intensional statement_ is a statement that is an instance of an intensional statement-form. Here co-extensive expressions are expressions with the same extension .
That is, a statement-form is intensional if it has, as one of its instances, a statement for which there are two co-extensive expressions (in the relevant language) such that one of them occurs in the statement, and if the other one is put in its place (uniformly, so that it replaces the former expression wherever it occurs in the statement), the result is a (different) statement with a different logical value. An intensional statement, then, is an instance of such a form; it has the same form as a statement in which substitution of co-extensive terms fails to preserve logical value.
* Everyone who has read _Huckleberry Finn_ knows that Mark Twain
* It is possible that
To see that these are intensional, make the following substitutions: (1) "Mark Twain" → "The author of 'Corn-pone Opinions'"; (2) "Aristotle" → "the tutor of Alexander the Great"; (3) can be seen to be intensional given "had a sister" → "had a sibling with two X-chromosomes".
It will be noted that the intensional statements above feature expressions like "knows", "possible", and "pleased". Such expressions always, or nearly always, produce intensional statements when added (in some intelligible manner) to an extensional statement, and thus they (or more complex expressions like "It is possible that") are sometimes called _intensional operators_. A large class of intensional statements, but by no means all, can be spotted from the fact that they contain intensional operators.
EXTENSIONAL STATEMENT FORM
An _extensional_ statement is a non-intensional statement. Substitution of co-extensive expressions into it always preserves logical value. A language is intensional if it contains intensional statements, and extensional otherwise. All natural languages are intensional. The only extensional languages are artificially constructed languages used in mathematical logic or for other special purposes and small fragments of natural languages.
* Mark Twain wrote _Huckleberry Finn_.
Note that if "Samuel Clemens" is put into (1) in place of "Mark Twain", the result is as true as the original statement. It should be clear that no matter what is put for "Mark Twain", so long as it is a singular term picking out the same man, the statement remains true. Likewise, we can put in place of the predicate any other predicate belonging to Mark Twain and only to Mark Twain, without changing the logical value. For (2), likewise, consider the following substitutions: "Aristotle" → "The tutor of Alexander the Great"; "Aristotle" → "The author of the 'Prior Analytics'"; "had a sister" → "had a sibling with two X-chromosomes"; "had a sister" → "had a parent who had a non-male child".
Intensional languages cannot be given an adequate semantics in terms of the extensions of expressions in them, since the extensions themselves do not suffice to determine a logical value. (If they did, then one could not change the logical value by substituting co-extensive expressions.) On the other hand, for the first half of the 20th century the only known systems of formal semantics worked by assigning extensions to expressions and used a Tarski -style truth-definition of statements constructed from the primitive expressions of the language under analysis. Hence, these semantical methods were pathetically inadequate for understanding the semantics of any but a few small artificial languages or mutilated fragments of natural languages.
This situation changed in the 1960s with the invention of possible-world or "intensional" semantics, the main form of which is due to Saul Kripke . Though this has enabled improvements in the semantic modelling of natural languages, much work remains to be done.
* ^ Antony Flew (1979). _Dictionary of Philosophy_. p. 117.
* Ferdinand de Saussure , _Course in General Linguistics _. Open Court Classics, July 1986. ISBN 0-8126-9023-0 * S. E. Palmer, _Vision Science: From Photons to Phenomenology_, 1999. MIT Press, ISBN 0-2621-6183-4