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+// Test math formulas.
+
+---
+The sum of $a$ and $b$ is $a + b$.
+
+---
+We will show that:
+$ a^2 + b^2 = c^2 $
+
+---
+Prove by induction:
+$ sum_(k=0)^n k = (n(n+1))/2 $
+
+---
+// Test that blackboard style looks nice.
+$ f: NN arrow RR $
+
+---
+// Error: 1:3 expected dollar sign
+$a