NCAA Division I-AA independent schools are four-year institutions whose football programs are not part of a football conference. This does not mean that I-AA independents schedule each other for competition like conference schools do. There are considerably less independent schools than in years past; many independent schools later join (or attempt to join) established conferences.
... terms of the coefficients a, b and c, which are assumed to be real (but see below for generalizations) with a being non-zero. These solutions are also ...