Fixed math in pages

_posts/2020-08-25-lecture-testing.md

@@ -3,6 +3,27 @@ layout: lecture
 title: "Testing of lecture notes"
 description: Filer for prosjekter og stæsj på NTNU.
 categories: ntnu lectures tdt4120
+math: true
 ---
 
-Lecture notes is fun
+Lecture notes is fun \eqref{test}.
+
+\begin{align}
+    E &= mc^2 \label{test} \\\\\
+      &= mv^s \nonumber
+\end{align}
+
+$\omega = 2 \pi f$
+
+In equation \eqref{eq:sample}, we find the value of an
+interesting integral:
+
+\begin{equation}
+  \int_0^\infty \frac{x^3}{e^x-1}\,dx = \frac{\pi^4}{15}
+  \label{eq:sample}
+\end{equation}
+
+\begin{bmatrix}
+  a & b \\\\\
+  c & c
+\end{bmatrix}