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The lines along which the derivatives of the dependent variables are indeterminate are called ___________

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The lines along which the derivatives of the dependent variables are indeterminate are called ___________

(a) parabolic lines

(b) characteristic lines

(c) hyperbolic lines

(d) transition lines

I got this question during an interview.

The doubt is from Classification of PDE topic in chapter Mathematical Behaviour of Partial Differential Equations of Computational Fluid Dynamics

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The correct choice is (b) characteristic lines

Explanation: The characteristic lines determine the type of the equation. These are defined as the lines along which the derivatives of the dependent variables do not exist.

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