Let K {\displaystyle {}K} be a field, and let V {\displaystyle {}V} be a K {\displaystyle {}K} -vector space of dimension n = dim K ( V ) {\displaystyle {}n=\dim _{K}{\left(V\right)}} . Suppose that n {\displaystyle {}n} vectors v 1 , … , v n {\displaystyle {}v_{1},\ldots ,v_{n}} in V {\displaystyle {}V} are given. Prove that the following facts are equivalent.