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Lemma 6.6 (Liouville theorem on ℝ m + n ) . [0553]

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Lemma 6.6 (Liouville theorem on ℝm+n\mathbb{R}^{m+n}).

Given m,n∈ℤ+m,n\in\mathbb{Z}_{+} with m+n≥3m+n\geq 3, Let μp∈(−1,1)∖{0}\mu_{p}\in(-1,1)\setminus\{0\} and let u∈C∞​(ℝm+n)u\in C^{\infty}(\mathbb{R}^{m+n}) be a harmonic function on the Euclidean space (ℝm+n,gℝm⊕gℝn)(\mathbb{R}^{m+n},g_{\mathbb{R}^{m}}\oplus g_{\mathbb{R}^{n}}). If uu satsifies

(6.42) |u⁡(x,y)|≤C|x|μp,∀(x,y)∈(ℝm∖{0})×ℝn,\displaystyle|u(x,y)|\leq\frac{C}{|x|^{\mu_{p}}},\ \forall(x,y)\in(\mathbb{R}^{m}\setminus\{0\})\times\mathbb{R}^{n},

then u≡0u\equiv 0 on ℝm+n\mathbb{R}^{m+n}.

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