Question

What are the two methods used to find the type of PDEs?

(a) Lagrangian Method and Eulerian method

(b) Cramer’s method and Eulerian method

(c) Cramer’s method and Lagrangian Method

(d) Cramer’s method and Eigenvalue method

I got this question in an interview.

My question comes from Classification of PDE in division Mathematical Behaviour of Partial Differential Equations of Computational Fluid Dynamics

Answer 1

Correct answer is (d) Cramer’s method and Eigenvalue method

Best explanation: Partial differential equations can be classified using their characteristic lines. These are located using either the Cramer’s method or the Eigenvalue method.