I now present an algebraic technique for expressing integrals over as surface integrals over . This was invented, as far as I am aware, by Mike Haggerty (unpublished), in response to the ugly vector algebra performed by Boasman [33] needed to achieve the result (H.14) in . I have generalized this technique to the case of singular matrices, and to the tensor divergence theorem.

Alex Barnett 2001-10-03