("O," vec(i) "," vec(j) "," vec(k)) "si " |vec(i)| = |vec(j)| = |vec(k)| = 1 "et " vec(i) _|_ vec(j) _|_ vec(k) "Noté aussi " (vec(e)_i) "si " |vec(e)_i| = 1 "et " vec(e_i) _|_ vec(e_j) "avec " i " et " j = 1 "," 2 "," 3
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