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Published online by Cambridge University Press: 31 October 2008
The important Binet-Cauchy theorem of determinants (3, p. 81)
may be illustrated as follows. Consider the identity
where ax = a1x1 + a2x2 + a3x3, and similarly for ay, bx, by. This identity follows by adding x1 row1 + x2row2 + x3row3 to row4 in the first determinant; and y1row1 + etc. to row5. Then by expanding both determinants in a Laplace development of the first three rows and the last two we obtain the identity
.