Full Idea
Nozick suggests that knowledge is just belief which 'tracks the truth' (hence leaving out justification).
Gist of Idea
Maybe knowledge is belief which 'tracks' the truth
Source
report of Robert Nozick (Philosophical Explanations [1981]) by Michael Williams - Problems of Knowledge Ch. 2
Book Reference
Williams,Michael: 'Problems of Knowledge' [OUP 2001], p.30