3. Matrix Range, Rank, and Pseudo-inverse Let A e Cmxn and b E C. Show that the following three statements are equivalent: - There exists a vector x E C" such that Ax = b, - Rank(A) = Rank ([A b]) where [A b] = Cmx(n+1) is a matrix obtained by appending b after the last column of A, and - AA¹b = b.

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3. Matrix Range, Rank, and Pseudo-inverse
Let A E Cmxn and b E Cm. Show that the following three
statements are equivalent:
- There exists a vector x E C" such that Ax = b,
- Rank(A) = Rank([A b]) where [A b] = Cmx(n+1) is a matrix
obtained by appending b after the last column of A, and
AA¹b = b.
Transcribed Image Text:3. Matrix Range, Rank, and Pseudo-inverse Let A E Cmxn and b E Cm. Show that the following three statements are equivalent: - There exists a vector x E C" such that Ax = b, - Rank(A) = Rank([A b]) where [A b] = Cmx(n+1) is a matrix obtained by appending b after the last column of A, and AA¹b = b.
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