Matrice remarquables - Matrice carrée, d'ordre n (n = p) - Matrice nulle : n x p, tous coeff = 0 - Matrice diagonale : matrice carrée, tous coeff en dehors diagonale = 0 - Matrice carrée unité, identitaire : diagonale à 1, reste à 0
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I remember the first time I was booked into a jazz club. I was scared to death. I'm not a jazz artist. So I got to the club and spotted this big poster saying, 'Richie Havens, folk jazz artist.' Then I'd go to a rock club and I'm billed as a 'folk rock performer' and in the blues clubs I'd be a 'folk blues entertainer.'