Genuine solutions and formal solutions with Gevrey type estimates of nonlinear partial differential equations
Genuine solutions and formal solutions with Gevrey type estimates of nonlinear partial differential equations
复制标题
非线性偏微分方程的 Gevrey 型估计的真解和形式解
DOI:
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发表时间:
1995
影响因子:
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通讯作者:
S. O'uchi
中科院分区:
文献类型:
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作者:
S. O'uchi
Let L(u) = L(z, ∂αu; |α| ≤ m) be a nonlinear partial differential operator defined in a neighbourhood Ω of z = 0 in C , where z = (z0, z ′) ∈ C × C . We consider a nonlinear partial differential equation L(u) = g(z), which has a formal solution ũ(z) of the form ũ(z) = z q 0( +∞ ∑ n=0 un(z ′)zqn 0 ) u0(z ′) ≡ 0, where q ∈ R and 0 = q0 < q1 < . . . < qn < . . . → +∞, with |un(z′)| ≤ ABnΓ( qn γ∗ + 1) γ∗ > 0, which we often call the Gevrey type estimate. It is the main purpose to show under some conditions that there exists a genuine solution uS1(z) with the asymptotic expansion uS1(z) ∼ ũ(z) as z0 → 0 in some sector S1. We apply the results to formal solutions constructed in Ōuchi [7]. 0.