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Unformatted text preview: Notes on linear algebra (Monday 17th October, 2016, 23:10) page 14 b 6 Example 2.18. If A = ( g b a . Now, we observe that if R is a row vector of some size m, and if C is a column vector of size m, then RC is a 1 X 1-matrix. More precisely: The product of a row 3:), then row2A = (d a f) and (201221 2 Cl (:2 . . vector ( r1 r2 - - - rm ) and a column vector . ls g1ven by cm 61 (32 (1‘1 1F‘2 rm) . =(T’101+f‘202+"'+1‘mcm)~ (4) Cm We shall often equate a 1 X 1-matrix with its (unique) entry; so the equality (4) rewrites as ...
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