. (PF), , :
PF = R - .
, . , , . . , .
, ( ). ' : 1) ? 2) , ? 3) ( )?
, : 1) , 2) .
.Գ , , , R > .
(R < ) , , (F). , : R > V.
R, R
F
QO Q
R , , . Գ . , , R = . , .
, Q O, ( R ).
(R) () .
, , , . , R < , . , (R = ). R = : , , .
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R,
R
QO Q
, Q O. , R .
R = . PF = R . ³, (), , . :
PF ′ = (R )′ = 0,
R ′ ′= 0,
R ′ = R, ′= ,
R = 0,
R =