# Tag Info

Given any triangulation $T$ of $A$, let $t_1, t_2, \ldots, t_f$ be the triangles of $T$ and $a_1, a_2, \ldots, a_f$ be the corresponding area. Define $$\theta_{ij} = \begin{cases} 1, & p_i \in t_j\\ 0, & \text{ otherwise } \end{cases} \quad\text{ for }\quad 1 \le i \le n;\; 1 \le j \le f$$ We have \$\displaystyle\;\phi(T)_i = \sum_{j=1}^f ...