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In mathematics, Brandt matrices are matric … In mathematics, Brandt matrices are matrices, introduced by Brandt, that are related to the number of ideals of given norm in an ideal class of a definite quaternion algebra over the rationals, and that give a representation of the Hecke algebra. calculated the traces of the Brandt matrices. Let O be an order in a quaternion algebra with class number H, and Ii,...,IH invertible left O-ideals representing the classes. Fix an integer m. Let ej denote the number of units in the right order of Ij and let Bij denote the number of α in Ij−1Ii with reduced norm N(α) equal to mN(Ii)/N(Ij). The Brandt matrix B(m) is the H×H matrix with entries Bij. Up to conjugation by a permutation matrix it is independent of the choice of representatives Ij; it is dependent only on the level of the order O.ependent only on the level of the order O.
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In mathematics, Brandt matrices are matric … In mathematics, Brandt matrices are matrices, introduced by Brandt, that are related to the number of ideals of given norm in an ideal class of a definite quaternion algebra over the rationals, and that give a representation of the Hecke algebra. calculated the traces of the Brandt matrices.culated the traces of the Brandt matrices.
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Brandt matrix
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