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  1. Devolution within a unitary state, like federalism, may be symmetrical, with all sub-national units having the same powers and status, or asymmetric, with sub-national units varying in their powers and status. Many unitary states have no areas possessing a degree of autonomy. In such countries, sub-national regions cannot decide their own laws.

  2. 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: