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Weakly harmonic function : ウィキペディア英語版
Weakly harmonic function

In mathematics, a function f is weakly harmonic in a domain D if
:\int_D f\, \Delta g = 0
for all g with compact support in D and continuous second derivatives, where Δ is the Laplacian. This is the same notion as a weak derivative, however, a function can have a weak derivative and not be differentiable. In this case, we have the somewhat surprising result that a function is weakly harmonic if and only if it is harmonic. Thus weakly harmonic is actually equivalent to the seemingly stronger harmonic condition.
==See also==

* Weak solution
* Weyl's lemma

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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