		\begin{equation*}
			\begin{aligned}
				||Tu_1-T\hat u_1||_1&=\sum_{i=1}^{d_1}\left|\int u_1(t)\phi_i(t)dt-\int \hat u_1(t)\phi_i(t)dt\right|\\
				&\le d_1||u_1-\hat u_1||_{L_2(\Omega)}.
			\end{aligned}
		\end{equation*}
