In basic equation Lu=f, L is a ____________
a) Matrix function
b) Differential operator
c) Degrees of freedom
d) No. of elements
Answer: b
Explanation: The method of weighted residual technique uses the weak form of physical problem or the direct differential equation. The basic equation Lu=f in that L is an differential operator. It uses the principle of orthogonality between Residual function and basis function.
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