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+---
+title: "Knowledge base"
+date: 2021-02-22
+layout: "default"
+---
+
+# Knowledge base
+
+Welcome to my knowledge base!
+
+Over the years, I've learned a lot of physics, mathematics, and computing.
+These are vast, difficult subjects, and I've spent many hours of my life
+trying to make sense of obscure, poorly explained concepts.
+To help me remember what I learn, I write notes in LaTeX.
+
+This knowledge base is based on my notes, and
+is freely available to anyone who needs it.
+I hope it helps you in your studies or work.
+
+Keep in mind that I'm only human, so there are probably mistakes here.
+I take no responsibility for any injuries.
+If you're doing something important,
+you should check things yourself!
+
+{% assign concepts = site.pages
+  | where_exp: "item", "item.layout == 'concept'"
+%}
+{% assign categories = site.pages
+  | where_exp: "item", "item.layout == 'category'"
+%}
+
+There are currently
+<a href="/know/concept/">{{ concepts.size }} articles</a>
+in this knowledge base, in
+<a href="/know/category/">{{ categories.size }} categories</a>.
+
+<p>Most recent articles:
+<ol>
+{% assign newest = concepts
+  | sort: "date"
+  | reverse
+  | slice: 0, 10
+%}
+{% for page in newest %}
+  <li><a href="{{ page.url }}">{{ page.title }}</a></li>
+{% endfor %}
+</ol>
+</p>