..,$\vec{u_k}$) and ($\vec{w_1}$,...,$\vec{w_k}$) are linearly independent tuples of vectors in a finite-dimensional vector space V, we can extend them to bases of V. Let B = {$\vec{u_1}$,...,$\vec{u_k}$,$\vec{u_{k+1}}$,...,$\vec{u_n}$} and C =
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