, .. . , :
yS = yS (p)
, .
. : .
, , :
WD = p dy/dL
. , , , W, ; , . , , WS = WS (L). , :
WS = WS (L, p).
WD (p, L) = WS (L). :
, , , .
8. AD AS , . AD, AS .
AD , AS :
AS AD ;
AS AD ;
AS AD , .
AD :
AS , ;
, ;
, , .
, AD . AD (. 2.4) , , . , . ( , , ). . 2.4.
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AD, , . , , . , .
.