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Cartan's lemma (potential theory)
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Cartan's lemma (potential theory) : ウィキペディア英語版
Cartan's lemma (potential theory)

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'':
:u(z) = \frac\int_\mathbf \log|z-\zeta|\,d\mu(\zeta)
Given ''H'' ∈ (0, 1), there exist discs of radius ''r''''i'' such that
:\sum_i r_i < 5H\,
and
:u(z) \ge \frac\log \frac
for all ''z'' outside the union of these discs.

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