The Decomposition Theorem

The Decomposition Theorem
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分解定理

DOI:
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发表时间:
1992
期刊:
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通讯作者:
W. Ramey
W. Ramey
中科院分区:
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文献类型:
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作者:
S. Axler;P. Bourdon;W. Ramey

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如果K <$Ω是紧的,而u是Ω K上的调和函数,那么u在<$K和<$Ω附近都可能表现不好,例如定理11.18。在本章中,我们将看到u是两个调和函数之和,一个调和地延拓过π K,另一个调和地延拓过π Ω。更准确地说,u具有形式的分解 $$u = u + w$$ 其中v是Ω上的调和函数,w是Rn K上的调和函数。此外,对于w有一个规范的选择,使这个分解唯一。
If K ⊂ Ω is compact and u is harmonic on Ω K, then u might be badly behaved near both ∂K and ∂Ω; see, for example, Theorem 11.18. In this chapter we will see that u is the sum of two harmonic functions, one extending harmonically across ∂K, the other extending harmonically across ∂Ω. More precisely, u has a decomposition of the form $$u = u + w$$ on Ω K, where v is harmonic on Ω and w is harmonic on R n K. Furthermore, there is a canonical choice for w that makes this decomposition unique.