i, Ii σ .
.
Lik . Lii ≪≫ , Lik, , ≪≫ ≪≫ . , Lii =ϰ;
I = D grad , L = D;
j = σ grad φ, L = σ ( ) . . . , (). Lik. , I 1,
.
Ii Xi . , .
Lik. , .
1931 . , ( ) , , , , :
.
, : Ik, Xi ( Xk≠i), Ii, Xk.
. ,
,
, , , , .
( ) . , ( , ), ( ), ( ). . (14.1) -, . , . , (14.1) Ii , () , , , . , ( ) ( ).
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