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In real algebraic geometry, the Łojasiewicz inequality, named after Stanisław Łojasiewicz, gives an upper bound for the distance of a point to the nearest zero of a given real analytic function. Specifically, let ƒ : ''U'' → R be a real-analytic function on an open set ''U'' in R''n'', and let ''Z'' be the zero locus of ƒ. Assume that ''Z'' is not empty. Then for any compact set ''K'' in ''U'', there exist positive constants α and ''C'' such that, for all ''x'' in ''K'' : Here α can be large. The following form of this inequality is often seen in more analytic contexts: with the same assumptions on ƒ, for every ''p'' ∈ ''U'' there is a possibly smaller open neighborhood ''W'' of ''p'' and constants θ ∈ (0,1) and ''c'' > 0 such that : ==References== * * 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「Łojasiewicz inequality」の詳細全文を読む スポンサード リンク
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