Update astensor.md

docs/api/functions/astensor.md

@@ -11,7 +11,7 @@ grand_parent: API Reference
 Converts a `Tensor2s` or `Tensor4s` data type to a full tensor storage `Tensor2` or `Tensor4`.
 
 $$
-\begin{equation}
+\begin{align}
 \boldsymbol{C} = \begin{bmatrix}
     C_{11} & C_{22} & C_{33} & C_{12} & C_{23} & C_{13}
 \end{bmatrix}^T \longrightarrow
@@ -20,18 +20,18 @@ $$
     C_{12} & C_{22} & C_{23} \\
     C_{13} & C_{23} & C_{33}
 \end{bmatrix}
-\end{equation}
+\end{align}
 $$
 
 $$
-\begin{equation}
-\mathbb{A} = \begin{bmatrix}
+\begin{align}
+\mathbb{A} &= \begin{bmatrix}
     A_{1111} & A_{1122} & A_{1133} & A_{1112} & A_{1123} & A_{1113} \\
     A_{2211} & A_{2222} & A_{2233} & A_{2212} & A_{2223} & A_{2213} \\
      \dots   &  \dots   &  \dots   &  \dots   &  \dots   &  \dots   \\
     A_{1311} & A_{1322} & A_{1333} & A_{1312} & A_{1323} & A_{1313}
 \end{bmatrix}
-\longrightarrow \begin{bmatrix}
+&\longrightarrow \begin{bmatrix}
     A_{1111} & A_{1112} & A_{1113} &
     A_{1121} & A_{1122} & A_{1123} &
     A_{1131} & A_{1132} & A_{1133} \\
@@ -43,7 +43,7 @@ $$
     A_{3121} & A_{3122} & A_{3123} &
     A_{3131} & A_{3132} & A_{3133}
 \end{bmatrix}
-\end{equation}
+\end{align}
 $$
 
 Alias: