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// Test math formulas.
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The sum of $a$ and $b$ is $a + b$.
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We will show that:
$ a^2 + b^2 = c^2 $
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Prove by induction:
$ sum_(k=0)^n k = (n(n+1))/2 $
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// Test that blackboard style looks nice.
$ f: NN arrow RR $
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#set math(family: "IBM Plex Sans")
// Error: 1-4 font is not suitable for math
$a$
---
// Error: 1:3 expected dollar sign
$a
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