1. Since, relevance is an ill-specified problem, we try to specify a relevance number R(.) to each document. The relevance number R(.) is given by:
R(d|Q,U,{d1...dk})
d- the document for which we are trying to find the relevance number.
Q- the query specified by the user
U- The user himself, as we have already established the fact that in IR systems, its the user who assigns the relevance to the document (or determine which document is more relevant to him).
{d1...dk}- already shown documents.
-Rashmi Dubey
