1D MLSM and FDM comparison

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Different numerical approaches to solving a Dirichlet or Neumann problem

\( \begin{align*} \text{Dirichlet} && \text{Neumann} \\ f''(x) &= 2x^2+5 \text{ on } (0, 1) & f''(x) &= 2x^2+5 \text{ on } (0, 1) \\ f(0) &= 1 & f'(0) &= 1 \\ f(1) &= 1 & f(1) &= 1 \\ f(x) &= \frac{1}{6} \left(x^4+15 x^2-16 x+6\right) & f(x) &= \frac{1}{6} \left(x^4+15 x^2+6 x-16\right) \end{align*} \)

were analysed. Theoretically, MLSM formulation and https://en.wikipedia.org/wiki/Finite_difference_method