3: Shape functions for Galerkin method

finite element - Basic explanation of shape function - Computational Science Stack Exchange

Finite elements/Finite element basis functions - Wikiversity

Finite element basis functions (1)

Polygonal Finite Element Methods

Detailed Explanation of the Finite Element Method (FEM)

Galerkin method

4.1.3 Shape Function

PDF] Simple and robust element-free Galerkin method with interpolating shape functions for finite deformation elasticity

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Solved 3. Consider the linear, second-order ODE