Playground-cheatsheet

∫M∥∇f(x)∥2∫MfL(f)∣∣12∑i∼j(fi−fj)2WijfTLf \begin{matrix} \large\displaystyle \int_\mathcal{M} \|\nabla f(x)\|^2 & \rule[0.4em]{7em}{0.02em} & \large\displaystyle\int_\mathcal{M} f\mathcal{L}(f) \\ \Biggm| & & \Biggm| \\ \large\displaystyle \frac12 \sum_{i\sim j} (f_i - f_j)^2 W_{ij} & \rule[0.4em]{7em}{0.02em} & \large\displaystyle \mathbf{f}^T L \mathbf{f} \end{matrix}