chapter  4
From Begriffsschrift to sense and reference
Pages 25

In his seminal paper Über Sinn und Bedeutung (1892, henceforth ‘SuB’) Frege introduces the distinction between an expression’s denotation or reference, and its sense. The distinction is made, in the first instance, with respect to proper names. Very crudely, though ‘Plato’s mentor’ and ‘Xanthippa’s husband’ have one and the same referent, namely (the man) Socrates, each corresponds to a different way in which this man is presented or determined. Corresponding to each of these modes of presentation is what Frege calls the name’s sense.