In an earlier paper in the Gazette the authors of [1] define what it meansfor a matrix in a set M of n x n matrices to be prime, namely if it is not theproduct of two matrices in M, neither of which is the identity. They thenshowed that there are exactly two primes in the set M2 of 2 x 2 matriceswith non-negative integral entries and unit determinant, namely
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机译：[1]的作者在《政府公报》上的一篇较早的论文中，定义了将n个x n矩阵的集合M中的矩阵设为素数的含义，即，如果它不是M中两个矩阵的乘积，则两者都不是同一性。然后他们表明，在具有非负整数项和单位行列式的2 x 2矩阵的集合M2中，确实有两个素数。
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