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Abel equation : ウィキペディア英語版
Abel equation

The Abel equation, named after Niels Henrik Abel, is a type of functional equations which can be written in the form
:f(h(x)) = h(x + 1)
or, equivalently,
:\alpha(f(x))=\alpha(x)+1
and controls the iteration of   .
==Equivalence==
These equations are equivalent. Assuming that is an invertible function, the second equation can be written as
: \alpha^(\alpha(f(x)))=\alpha^(\alpha(x)+1)\, .
Taking , the equation can be written as
::f(\alpha^(y))=\alpha^(y+1)\, .
For a function assumed to be known, the task is to solve the functional equation for the function , possibly satisfying additional requirements, such as .
The change of variables , for a real parameter , brings Abel's equation into the celebrated Schröder's equation, .
The further change into Böttcher's equation, .
The Abel equation is a special case of (and easily generalizes to) the translation equation,〔Aczél, János, (1966): ''Lectures on Functional Equations and Their Applications'', Academic Press, reprinted by Dover Publications, ISBN 0486445232 .〕
:\omega( \omega(x,u),v)=\omega(x,u+v) ~,
e.g., for \omega(x,1)= f(x),
:\omega(x,u)= \alpha^(\alpha(x)+u) .     (Observe .)

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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