cp-algorithms
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 <ul class="metadata page-metadata" data-bi-name="page info" lang="en-us" dir="ltr">
 
   Last update:
-  <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="April 18, 2025 18:42:14">April 18, 2025</span>&emsp;
+  <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="April 22, 2025 01:19:59">April 22, 2025</span>&emsp;
 
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@@ -6799,6 +6809,9 @@ <h2 id="properties">Properties<a class="headerlink" href="#properties" title="Pe
 <li>Cassini's identity:</li>
 </ul>
 <div class="arithmatex">$$F_{n-1} F_{n+1} - F_n^2 = (-1)^n$$</div>
+<blockquote>
+<p>This can be proved by induction. A one-line proof by Knuth comes from taking the determinant of the 2x2 matrix form below.</p>
+</blockquote>
 <ul>
 <li>The "addition" rule:</li>
 </ul>
@@ -7021,7 +7034,7 @@ <h2 id="practice-problems">Practice Problems<a class="headerlink" href="#practic
 
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