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“It is natural, now, to think of there being connected with a sign (name, combination of words, letter) besides that to which the sign refers, which may be called the reference of the sign, also what I should like to call the sense of the sign, wherein the mode of presentation is contained. In our example, accordingly, [an example in which lines a, b, and c all intersect at a single point] the reference of the expressions 'the point of intersection of a and b' and 'the point of intersection of b and c' would be the same, but not their senses. The reference of 'evening star' would be the same as that of 'morning star', but not the sense.”
Gottlob Frege.
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XHTML1.0, CSS3.