Classification of second order Partial Differential Equations

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Helps to understand how classify second order pdes as elliptic, parabolic or hyperbolic using either the method of the discriminant or the method of determinants
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i have a question. so comparing with the general form, is it wrong to rearrange the given equation to look like the general form before proceeding to do the working?

odetteowusu-afriyie
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I have a question. In example 2, you chose the coefficient of Utt to be a, but in example 3, you chose the coefficient of Uxx to a. What determines which coefficient is a or c?

michaelagyare