removed the matrix latex error

docs/theory.md

@@ -194,16 +194,16 @@ The first column represents the degree $n$, the second column represents the ord
 This is a variation of the clm-format for compact notation with just 3 or 4 columns. The coefficients are sorted first w.r.t. degree and then the order, particularly the sine-coefficients are arranged starting first with negative orders. The following matrix represents the klm-format:
 
 \begin{bmatrix}
-    0 & 0 & $\overline{C}_{0, 0}$ & $\sigma_{\overline{C}_{0, 0}}$ \\
-    0 & 0 & $\overline{C}_{0, 0}$ & $\sigma_{\overline{C}_{0, 0}}$ \\
-    0 & 0 & $\overline{C}_{0, 0}$ & $\sigma_{\overline{C}_{0, 0}}$ \\ 
-    0 & 0 & $\overline{C}_{0, 0}$ & $\sigma_{\overline{C}_{0, 0}}$ \\ 
-    0 & 0 & $\overline{C}_{0, 0}$ & $\sigma_{\overline{C}_{0, 0}}$ \\ 
-    0 & 0 & $\overline{C}_{0, 0}$ & $\sigma_{\overline{C}_{0, 0}}$ \\ 
-    0 & 0 & \overline{C}_{0, 0} & $\sigma_{\overline{C}_{0, 0}}$ \\ 
-    0 & 0 & $\overline{C}_{0, 0}$ & $\sigma_{\overline{C}_{0, 0}}$ \\
-    0 & 0 & $\overline{C}_{0, 0}$ & $\sigma_{\overline{C}_{0, 0}}$ \\ 
-    \vdots & & & \vdots \\ $N_{max}$ & $N_{max}$ & $\overline{C}_{N_{max}, N_{max}}$ & $\sigma_{\overline{C}_{N_max}, N_{max}}$ \\
+    0 & 0 & \overline{C}_{0, 0} & \sigma_{\overline{C}_{0, 0}} \\
+    0 & 0 & \overline{C}_{0, 0} & \sigma_{\overline{C}_{0, 0}} \\
+    0 & 0 & \overline{C}_{0, 0} & \sigma_{\overline{C}_{0, 0}} \\ 
+    0 & 0 & \overline{C}_{0, 0} & \sigma_{\overline{C}_{0, 0}} \\ 
+    0 & 0 & \overline{C}_{0, 0} & \sigma_{\overline{C}_{0, 0}} \\ 
+    0 & 0 & \overline{C}_{0, 0} & \sigma_{\overline{C}_{0, 0}} \\ 
+    0 & 0 & \overline{C}_{0, 0} & \sigma_{\overline{C}_{0, 0}} \\ 
+    0 & 0 & \overline{C}_{0, 0} & \sigma_{\overline{C}_{0, 0}} \\
+    0 & 0 & \overline{C}_{0, 0} & \sigma_{\overline{C}_{0, 0}} \\ 
+    \vdots & & & \vdots \\ N_{max} & N_{max} & \overline{C}_{N_{max}, N_{max}} & \sigma_{\overline{C}_{N_max}, N_{max}} \\
  \end{bmatrix}