MATB24H3 Lecture Notes - Orthogonal Matrix, Orthogonal Complement, Hermitian Matrix
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In this lecture we will work with matrices that have entries from c. Since we know that c is a eld we know that every nonzero element in c has an inverse. And from the previous lecture we know that for an nonzero z c, as entries. We use that to reduce matrices with complex numbers z 1 = z. Example: find the inverse of the matrix a = i. 2 2 + i i 4 i. However, you must always use the addition and multiplication as de ned in the eld c. The dot product makes rn an inner product space. If we try it we see that there are some problems. For example, in c2 if v = [a, ai] for a 6= 0 gives kvk2 = [a, ai] [a, ai] = a2 a2 = 0. Also if b = [a, bi] with a < b then: kbk2 = [a, bi] [a, bi] = a2 b2 < 0.
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