准对角矩阵
- 网络quasi-diagonal matrix
准对角矩阵-
利用有限域上的2级准对角矩阵构作Cartesian认证码，计算出了该类认证码的参数。
A construction of Cartesian Authentication Codes from 2 by 2 Quasi diagonal matrices over finite fields are presented and their size parameters are computed .
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同时，还利用弱直积的性质得到了四元数正规矩阵酉相似于准对角矩阵的充分条件。
Meanwhile , the sufficient conditions for that is given that quaternion normal matrices is unitary similarity to quasi-diagonal matrices by applying the properties of weak direct product .