existence theorems for weak solutions
existence theorems for weak solutions
弱解的存在定理
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Thfi existence and uniqueness theorems of weak solutions of initial-boundary value problems for nonlinear degenerate parabolic systems were established by lower-upper solution method.
应用上、下解方法证明非线性退缩抛物型方程组初边值问题弱解的存在唯一性。
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