Full Idea
It is the insistence on identity between objects wholly present at different times which gives rise to the problem of change.
Gist of Idea
The problem of change arises if there must be 'identity' of a thing over time
Source
Katherine Hawley (How Things Persist [2001], 2.2)
Book Reference
Hawley,Katherine: 'How Things Persist' [OUP 2004], p.43
A Reaction
My solution is to say things are the 'same', in a slightly loose non-transitive way, rather than formally identical, which is a concept from maths, not from reality.