| Definition: | number k in the expression X for the initial phase of quantity number i of the set of m quantities forming a symmetric polyphase system, where θ0 is the initial phase of one of the quantities which is arbitrarily chosen out of the set of m quantities, i is one of the integers 1, 2, ..., m , and k is a characteristic of the system, equal to one of the integers 0, 1, 2, ... , m - 1
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