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Unique solvability of some nonlinear partial differential equations with Fuchsian and irregular singularities

机译:具有Fuchsian和不规则奇异性的某些非线性偏微分方程的唯一可解性

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摘要

The paper considers nonlinear partial differential equations of the form t((6)u/(6)t) = F(t,x,u,(6)u/(6)x), with independent variables (t,x) ∈ R × C, and where F(t, x, u, v) is a function continuous in t and holomorphic in the other variables. It is shown that the equation has a unique solution in a sectorial domain centered at the origin under the condition that F(0, x, 0,0) = 0, ReF_u(0, 0,0,0) < 0, and F_v(0,x,0, 0) = x~(p+1)-γ(x), where γ(0) ≠ 0 and p is any positive integer. In this case, the equation has a Fuchsian singularity at t = 0 and an irregular singularity at x - 0.
机译:本文考虑形式为t((6)u /(6)t)= F(t,x,u,(6)u /(6)x)的非线性偏微分方程,具有独立变量(t,x) ∈R×C,其中F(t,x,u,v)是在t中连续且在其他变量中全纯的函数。结果表明,在F(0,x,0,0)= 0,ReF_u(0,0,0,0)<0和F_v的条件下,该方程在以原点为中心的扇形域中具有唯一解。 (0,x,0,0)= x〜(p + 1)-γ(x),其中γ(0)≠0并且p是任何正整数。在这种情况下,该方程在t = 0时具有Fuchsian奇点,在x-0时具有不规则奇点。

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