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1962
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Georges Papy et al., « Généralisation d'un lemme de D. Hall et A. S. Wightman », Bulletins de l'Académie Royale de Belgique, ID : 10.3406/barb.1962.65418
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We put down a necessary and sufficient condition for grammian matrices of two columns of a vector Space of finite dimension over an algebraically closed field to be equal. This condition has been obtained by D. Hall and A.S. Wightman (II) for a four dimensional space over the field of complex numbers.