<?xml version="1.0" encoding="UTF-8"?><rss version="2.0"><channel><title>Feiyu Deng — Notes</title><link>https://flyfish1097.com/en/notes/</link><description>Public notes on theoretical physics and research method.</description><item><title><![CDATA[What a defect extremal surface is]]></title><link>https://flyfish1097.com/en/notes/what-a-defect-extremal-surface-is/</link><guid>https://flyfish1097.com/en/notes/what-a-defect-extremal-surface-is/</guid><pubDate>Mon, 13 Jul 2026 00:00:00 GMT</pubDate><description><![CDATA[A geometric explanation of why a quantum correction localized on a defect changes the surface that computes entropy.]]></description></item><item><title><![CDATA[Geometry as compression in theoretical physics]]></title><link>https://flyfish1097.com/en/notes/geometry-as-compression/</link><guid>https://flyfish1097.com/en/notes/geometry-as-compression/</guid><pubDate>Mon, 13 Jul 2026 00:00:00 GMT</pubDate><description><![CDATA[When a diagram is useful, what has it actually compressed—and what assumptions can it hide?]]></description></item><item><title><![CDATA[How to audit a long analytical derivation]]></title><link>https://flyfish1097.com/en/notes/audit-a-long-derivation/</link><guid>https://flyfish1097.com/en/notes/audit-a-long-derivation/</guid><pubDate>Mon, 13 Jul 2026 00:00:00 GMT</pubDate><description><![CDATA[A reproducible workflow for conventions, dependencies, limiting cases, and unresolved mismatches.]]></description></item></channel></rss>