- Our condition becomes
(linear nature of integral ensures that (NI.4) guarantees exactness of (NI.2) for all polynomials of degree ).

- We can write (NI.4) as:
is column vector of 's, is column vector of 's and

**A**is matrix of coefficients . It is easy to show that**A**is nonsingular (if distinct) and hence that (NI.5) can be solved and (NI.2) established for any in (NI.1). - Usually (NI.5) is solved---once and for all for given
---and then (NI.2) can be used quickly for any
that crops up.

Geoffrey Fox, Northeast Parallel Architectures Center at Syracuse University, gcf@npac.syr.edu