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In which of these methods, the differential equation is multiplied by a test function?

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In which of these methods, the differential equation is multiplied by a test function?

(a) Finite difference method

(b) Finite volume method

(c) Finite element method

(d) Spectral element method

I have been asked this question during an internship interview.

I would like to ask this question from Discretization in portion Basic Aspects of Discretization, Grid Generation with Appropriate Transformation of Computational Fluid Dynamics

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Correct option is (d) Spectral element method

For explanation: Spectral element method multiplies the differential equation by a random test function and then integrates it over the entire domain.

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