Cubic Hermite#
See [Uhlmann2016].
(1)#\[\begin{split}\phi_1(t)=\begin{cases}
(2|t|+1)(|t|-1)^2 & |t| \in [0,1] \\
0 & \mathrm{elsewhere}
\end{cases}\end{split}\]
(2)#\[\begin{split}\phi_2(t)=\begin{cases}
t(|t|-1)^2 & |t| \in [0,1] \\
0 & \mathrm{elsewhere}
\end{cases}\end{split}\]
