Full Idea
People often speak of identity over time and distinguish it from identity at a time. But identity is just identity.
Gist of Idea
Identity over a time and at a time aren't different concepts
Source
David Wiggins (Sameness and Substance Renewed [2001], 2.3)
Book Reference
Wiggins,David: 'Sameness and Substance Renewed' [CUP 2001], p.32
A Reaction
I myself am guilty of such usage, but it doesn't imply a commitment to a multivocal concept. The epistemological issues (of explaining what it is now, and simply reidentifying it later) seem profoundly different. Hume only admits identity over time.