| http://www.w3.org/ns/prov#value | - Consider the two real symmetric quadratic forms u T Au and u T Bu,whereu T stands for the row matrix (xyz), and denote by u n those column matrices that satisfy Bu n = ? n Au n , (E9.1) in which n is a label and the ? n are real, non-zero and all di?erent. (a) By multiplying (E9.1) on the left by (u m ) T , and the transpose of the corre- sponding equation for u m on the right by u n , show that (
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