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The Abel equation, named after Niels Henrik Abel, is a type of functional equations which can be written in the form : or, equivalently, : and controls the iteration of . ==Equivalence== These equations are equivalent. Assuming that is an invertible function, the second equation can be written as : Taking , the equation can be written as :: 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 .〕 : e.g., for , :. (Observe .) 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Abel equation」の詳細全文を読む スポンサード リンク
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