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In metaphysics, extension signifies both 'stretching out' (Latin: extensio) as well as later 'taking up space', and most recently, spreading one's internal mental cognition into the external world. The history of thinking about extension can be traced back at least to Archytas ' spear analogy for the infinity of space.
An extensional definition gives meaning to a term by specifying its extension, that is, every object that falls under the definition of the term in question.. For example, an extensional definition of the term "nation of the world" might be given by listing all of the nations of the world, or by giving some other means of recognizing the members of the corresponding class.
In any of several fields of study that treat the use of signs — for example, in linguistics, logic, mathematics, semantics, semiotics, and philosophy of language — the extension of a concept, idea, or sign consists of the things to which it applies, in contrast with its comprehension or intension, which consists very roughly of the ideas, properties, or corresponding signs that are implied ...
Res extensa is one of the two substances described by René Descartes in his Cartesian ontology [1] (often referred to as "radical dualism"), alongside res cogitans.Translated from Latin, "res extensa" means "extended thing" while the latter is described as "a thinking and unextended thing". [2]
In philosophy of mind, the extended mind thesis says that the mind does not exclusively reside in the brain or even the body, but extends into the physical world. [3] The thesis proposes that some objects in the external environment can be part of a cognitive process and in that way function as extensions of the mind itself.
In Principles of Philosophy (1644) he writes: "The nature of body consists just in extension—not in weight, hardness, colour or the like." [ 62 ] The main difference between atomism and Descartes' concept was the existence of the void.
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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. [3]