Full Idea
My basic Fregean idea is that a sense is individuated by the fundamental condition for something to be its reference.
Gist of Idea
A sense is individuated by the conditions for reference
Source
Christopher Peacocke (Truly Understood [2008], Intro)
Book Reference
Peacocke,Christopher: 'Truly Understood' [OUP 2008], p.3
A Reaction
For something to actually be its reference (as opposed to imagined reference), truth must be involved. This needs the post-1891 Frege view of such things, and not just the view of concepts as functions which he started with.