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Clarkson's inequalities
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Clarkson's inequalities : ウィキペディア英語版
Clarkson's inequalities
In mathematics, Clarkson's inequalities, named after James A. Clarkson, are results in the theory of ''L''''p'' spaces. They give bounds for the ''L''''p''-norms of the sum and difference of two measurable functions in ''L''''p'' in terms of the ''L''''p''-norms of those functions individually.
==Statement of the inequalities==

Let (''X'', Σ, ''μ'') be a measure space; let ''f'', ''g'' : ''X'' → R be measurable functions in ''L''''p''. Then, for 2 ≤ ''p'' < +∞,
:\left\| \frac \right\|_^p + \left\| \frac \right\|_^p \le \frac \left( \| f \|_^p + \| g \|_^p \right).
For 1 < ''p'' < 2,
:\left\| \frac \right\|_^q + \left\| \frac \right\|_^q \le \left( \frac \| f \|_^p +\frac \| g \|_^p \right)^\frac,
where
:\frac1 + \frac1 = 1,
i.e., ''q'' = ''p'' ⁄ (''p'' − 1).
The case ''p'' ≥ 2 is somewhat easier to prove, being a simple application of the triangle inequality and the convexity of
:x \mapsto x^p. \,

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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