The following analogy of the Plemelj's symmetrization principle was proved in [1]}:
\(\mathbb {S}_{\partial D} \mathbb {K}_{\partial D}^* = \mathbb {K}_{\partial D} \mathbb {S}_{\partial D}.\) 

Следующая аналогия принципа симметризации Племеля была доказана в [1]: 

\(\mathbb {S}_{\partial D} \mathbb {K}_{\partial D}^* = \mathbb {K}_{\partial D} \mathbb {S}_{\partial D}.\)