Some scholars oppose even the "weakly unitary" theory and favor creating a plural executive, as in the many state governments that separately elect an attorney general. However, those scholars acknowledge that a constitutional amendment would be required to eliminate the federal unitary executive.
For any nonnegative integer n, the set of all n × n unitary matrices with matrix multiplication forms a group, called the unitary group U(n). Any square matrix with unit Euclidean norm is the average of two unitary matrices. Equivalent conditions. If U is a square, complex matrix, then the following conditions are equivalent: