Covariant formalism for equal-time commutators

For equal-time commutators of general form with an arbitrary finite number of Schwinger terms a manifestly covariant formalism is developed. In this formalism the construction of relativistically invariant systems of equal-time commutators reduces to standard manipulations with four-dimensional tensor indices. Specific covariant properties of the equaltime commutators of conserved currents are obtained. Examples are considered of the “covariantization” of equal-time commutators; these examples are of not only methodological but also independent significance.