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# By [Theorem 2.20](https://arxiv.org/abs/2302.08448) it turns out that the *derivatives* of the half-range Chebyshev polynomials are a linear combination of at most two polynomials orthogonal with respect to $\sqrt{(3+y)(1-y)}(1+y)$ on $(-1,1)$. This fact enables us to compute the banded differentiation matrix:
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v̂ =3*u+XP[1:N+1,1:N]*u
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v =jac2jac(v̂, -0.5, 0.0, 0.5, 1.0; norm1 =true, norm2 =true)
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