Full Idea
Your belief that you existed in the year 2000 is true; the belief of a segment of you that it then existed is false; so, by the indiscernibility of identicals, there must be two beliefs here.
Gist of Idea
You believe you existed last year, but your segment doesn't, so they have different beliefs
Source
Trenton Merricks (Truth and Ontology [2007], 6.IV n20)
Book Reference
Merricks,Trenton: 'Truth and Ontology' [OUP 2007], p.141
A Reaction
Merricks may be begging the question here. But in the segment view there is nothing which can truly believe it existed a year ago, so therefore nothing here has continued existence, so the segments cannot be part of a single thing.