The Student Room Group

vectors and matrices

3.png

managed to get

(UTU)ij=k=1n(vkui)(vkuj)(U^TU)_{ij}=\sum\limits_{k=1}^n (v_k \cdot u_i)(v_k \cdot u_j)

how do i show this is δij \delta_{ij}
(edited 9 years ago)

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