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In potential theory, a branch of mathematics, Cartan's lemma, named after Henri Cartan, is a bound on the measure and complexity of the set on which a logarithmic Newtonian potential is small. ==Statement of the lemma== The following statement can be found in Levin's book.〔B.Ya. Levin, ''Lectures on Entire Functions''〕 Let ''μ'' be a finite positive Borel measure on the complex plane C with ''μ''(C) = ''n''. Let ''u''(''z'') be the logarithmic potential of ''μ'': : Given ''H'' ∈ (0, 1), there exist discs of radius ''r''''i'' such that : and : for all ''z'' outside the union of these discs. 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「Cartan's lemma (potential theory)」の詳細全文を読む スポンサード リンク
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