I$\heartsuit$LA: Compilable Markdown for Linear Algebra

\begin{align*} A_{i, j} & = \begin{cases} 1 & \text{if} \left( i, j \right) \in E \\ 0 & \text{otherwise} \end{cases} \\ D_{i,i} & = \sum_j A_{i, j} \\ L & = D^{-1}\left( D A \right) \\ \intertext{where} E & \in \{\mathbb{Z} \times \mathbb{Z}\} \\ A & \in \mathbb{R}^{ n \times n } \\ n & \in \mathbb{Z} \end{align*} A = sparse(E(:,1),E(:,2),1,n,n); D = diag(sum(A,2)); L = D\(D-A); \centering \resizebox{\textwidth}{!} { \begin{minipage}[c]{\textwidth} \begin{align*} \textit{A}_{\textit{i}, \textit{j}} & = \begin{cases} 1 & \text{if} \left( \textit{i}, \textit{j} \right) \in \textit{E} \\ 0 & \text{otherwise} \end{cases} \\ \textit{D}_{\textit{i},\textit{i}} & = \sum_\textit{j} \textit{A}_{\textit{i}, \textit{j}} \\ \textit{L} & = \textit{D}^{-1}\left( \textit{D} \textit{A} \right) \\ \intertext{where} \textit{E} & \in \{\mathbb{Z} \times \mathbb{Z}\} \\ \textit{A} & \in \mathbb{R}^{ \textit{n} \times \textit{n} } \\ \textit{n} & \in \mathbb{Z} \end{align*} \end{minipage} } LaTeX output