“Function and Concept”的意思、由来-开放百科全书

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Function and Concept

释义

Overview
Works cited
External links

"Function and Concept" ({{lang-de|Über Funktion und Begriff}}, "On Function and Concept") is an article by Gottlob Frege, published in 1891. The article involves a clarification of his earlier distinction between concepts and objects.

Overview

In general, a concept is a function whose value is always a truth value (139). A relation is a two place function whose value is always a truth value (146).

Frege draws an important distinction between concepts on the basis of their level. Frege tells us that a first-level concept is a one-place function that correlates objects with truth-values (147). First level concepts have the value of true or false depending on whether the object falls under the concept. So, the concept has the value the True with the argument the object named by 'Jamie' if and only if Jamie falls under the concept (or is in the extension of F).

Second order concepts correlate concepts and relations with truth values. So, if we take the relation of identity to be the argument , the concept expressed by the sentence:

correlates the relation of identity with the True.

The conceptual range (Begriffsumfang) follows the truth value of the function:

x2 = 1 and (x + 1)2 = 2(x + 1) have the same conceptual range.

Works cited

"On Function and Concept" in The Frege Reader, ed. Michael Beaney, 1997, pp. 130–148

External links

Logical constants
Frege's writings
English versions
Terence D. Parsons: Frege's Hierarchies, 1981

5 : 1891 essays|Philosophy essays|Philosophy of language|Works by Gottlob Frege|Logic literature

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