si et seulement si c'est une matrice de Hadamard. Certaines opérations élémentaires transforment une matrice de Hadamard en une autre : permutation de lignes ou de colonnes, multiplication d'une ligne ...
La matrice peut représenter la rotation dans un repère orienté positivement ou négativement. Référentiel fixe ou mobile Les axes de coordonnées peuvent être fixés ou tourner avec un solide. Vecteurs ...
IN an earlier paper1, we have described a new type of interferometer which has been used to measure the angular diameter of radio stars2. In this instrument the signals from two aerials Ax and A2 (Fig ...
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