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azhi
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Why is it impossible to reduce a linear PDE of the second order in more than two independent variables to canonical form globally
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Why is it impossible to reduce a linear PDE of the second order in more than two independent variables to canonical form globally
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how to solve this system of nonlinear differential equations
the original problem needs the condtion that $t\not=0.$
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how to solve this system of nonlinear differential equations
@Michael Renardy: Thanks a lot. Your answer is very helpful.
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how to solve this system of nonlinear differential equations
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how to solve this system of nonlinear differential equations