Base vectorielle orthonormée directe

("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

Retours à la liste d'équation