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→Equations of mixed type
=== Equations of mixed type ===
=== Equations of mixed type ===
混合型方程
If a PDE has coefficients that are not constant, it is possible that it will not belong to any of these categories but rather be of '''mixed type'''. A simple but important example is the [[Euler–Tricomi equation]]
If a PDE has coefficients that are not constant, it is possible that it will not belong to any of these categories but rather be of '''mixed type'''. A simple but important example is the [[Euler–Tricomi equation]]