APPLICATION OF SYMBOL-OPERATOR TECHNIQUE

In the present talk we briefly demonstrate an elegant and effective technique for calculation of the trace expansion in the derivatives of background fields. One of main advantages of the technique is manifestly (super)symmetrical and gauge invariant form of expressions on all stages of calculations. Other advantage is the universality of the calculation method. It shows itself to be good for calculation of one-loop effective action in several well-known models and new results in supersymmetrical models has already been found.