Table 3 For $\mathit{N}\mathbf{=}\mathbf{20}$ and $\mathit{h}\mathbf{=}\mathbf{0.1}$ , the exact solutions ${\mathit{\mu }}_{\mathit{k}}$ are all inside the interval $\mathbf{[}{\mathit{a}}_{\mathbf{-}}\mathbf{,}{\mathit{a}}_{\mathbf{+}}\mathbf{]}$ for different values of ε

Exact ${\mu }_k$

0.579603114810978

1.7849838948888357

3.238647349751419

4.770562335590527

$I_{\epsilon ,N}$, ε = 10⁻²

[0.5346366,0.6204846]

[1.7756360,1.7941072]

[3.23662663,3.2406609]

[4.7698996,4.7712244]

$I_{\epsilon ,N}$, ε = 10⁻⁵

[0.5795603,0.5796458]

[1.7849746,1.7849931]

[3.2386453,3.2386493]

[4.7705616,4.7705630]