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F (x) f (x) X =(a, b) ( ), f (x) F (x), ..
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f (x) [ a, b ]. f (x) a b , :
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f (x) [ a, b ]. F (x) - f (x) [ a, b ],
, 0 x, x = a, x = b f (x) ( 1),
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F (x) G (x) - f (x) g (x), . f (x) ≥ g (x) [ a, b ], , y = f (x), y = g (x) x = a, x = b ( 2),
x t x = g (t):
t
g -1 - g, .. t = g -1(x).