<?xml version="1.0" encoding="utf-8"?><feed xmlns="http://www.w3.org/2005/Atom" xml:lang="en"><generator uri="https://jekyllrb.com/" version="4.4.1">Jekyll</generator><link href="https://christophspiegel.berlin/appendix/feed.xml" rel="self" type="application/atom+xml" /><link href="https://christophspiegel.berlin/" rel="alternate" type="text/html" hreflang="en" /><updated>2026-09-14T19:09:41+02:00</updated><id>https://christophspiegel.berlin/appendix/feed.xml</id><title type="html">Christoph Spiegel</title><subtitle>Mathematician at Zuse Institute Berlin working on combinatorics, computational mathematics, and AI for scientific discovery. Research, publications, and teaching.</subtitle><author><name>Christoph Spiegel</name></author></feed>