For a set of nnn column vectors, they are orthonormal iff: They are pairwise orthogonal AND For all nnn column vectors their norm is 111 ∀i∈{ 1,…,n },∣∣vi∣∣=1\forall i \in \set{1,\dots,n}, ||v_i||=1∀i∈{1,…,n},∣∣vi∣∣=1