Full Idea
In the case of an actual proper name such as 'Aristotle' opinions as to the sense may differ. It might, for instance, be taken to be the following: the pupil of Plato and teacher of Alexander the Great.
Gist of Idea
People may have different senses for 'Aristotle', like 'pupil of Plato' or 'teacher of Alexander'
Source
Gottlob Frege (On Sense and Reference [1892], note), quoted by Bernard Linsky - Quantification and Descriptions 1
Book Reference
'Bloomsbury Companion to Philosophical Logic', ed/tr. Horsten,L/Pettigrew,R [Bloomsbury 2014], p.79
A Reaction
This note is 'notorious', and was a central target for Kripke's critique. Frege says people's senses may vary on this, and thinks the sense of 'Aristotle' can be accurately expressed.
Related Idea
Idea 18774 Definite descriptions, unlike proper names, have a logical structure [Linsky,B]