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+$$START TITLE
+Calculus
+$$END TITLE
+
+$$START CONTENT
+<h1>Calculus</h1>
+<p>
+Calculus is the age-old study of infinetesimal rates of change.
+I write articles here from the perspective of hyperreal numbers
+instead of using limits because they were the original intuitive
+way that calculus was invented (and how I originally reinvented
+the derivative).
+</p>
+
+<h2>Elementary Calculus</h2>
+<ul>
+	<li><a href="./derivative.pdf">Derivative</a> -- a fundamental operation regarding calculus.</li>
+	<li><a href="./derivative_identities.pdf">Derivative Identities</a> -- Deriving identities related to derivatives of simple functions.</li>
+	<li><a href="./derivative_rules.pdf">Derivative Rules</a> -- Deriving common derivative rules.</li>
+</ul>
+
+<h2>Multivariable</h2>
+<ul>
+	<li><a href="./partial_derivative.pdf">Partial Derivative</a> -- a fundamental operation regarding mulitvariable calculus.</li>
+</ul>
+$$END CONTENT