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Linear Algebra (1.25-26.PKN25/M)
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The least squares solution to is the vector closest to
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If is the identity matrix, then is orthogonal
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Every rectangular matrix possesses a unique QR-factorization
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If the rows of a square matrix form an orthonormal set, then is orthogonal
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In the -factorization of a matrix , is non-singular if and only if is non-singular
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If , then
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If is orthogonal to every row of a matrix , then is in the nullspace of
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If , then the norms of and are larger than
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If , then either or
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If is invertible, then has independent columns
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