. , . . . , .
, . , (). , ( ) () , .
, . , , δ:
ΔI = Δγ δ
, :
- , , δ ;
- , , δ .
. :
1) ;
2) ;
3) .
1. .
. . , , , :
GC = S,
G :
G = Δγ/ γ, .. ;
= I/ Δγ , β = 1/
S .
GC , , S.
2. .
GwCr = S,
Gw - ;
Cr .
G = Gw, . , .
G > Gw, S = const C< Cr
. , , , - , G Gw.
G < Gw, S = const C> Cr,
, , .
, G Gw . . , . . .
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3. .
GnCr = ≠ S,
Gn .
: Gn, Gw G .
1. , Gw > Gn, Gn > G. (Cr < C), .
2. Gw < Gn, .
Gw > G , Gw < Gn, Cr > C .
. , Gw = Gn .
. , . . - . , , .
, . 1930 . ( 50- 70- ..) , .
. - , , . . . , "" ; , . , , . -, , , .