<!doctype html><html lang="en" class="no-js"><head><meta charset="utf-8"> <!-- begin SEO --><title>Qinxin Yan</title><meta property="og:locale" content="en-US"><meta property="og:site_name" content="Qinxin Yan"><meta property="og:title" content="Qinxin Yan"><link rel="canonical" href="https://qinxin-yan.github.io/assets/css/cosmic-sociology.css"><meta property="og:url" content="https://qinxin-yan.github.io/assets/css/cosmic-sociology.css"> <script type="application/ld+json"> { "@context" : "http://schema.org", "@type" : "Person", "name" : "Qinxin Yan", "url" : "https://qinxin-yan.github.io", "sameAs" : null } </script> <!-- end SEO --><link href="https://qinxin-yan.github.io/feed.xml" type="application/atom+xml" rel="alternate" title="Qinxin Yan Feed"> <!-- http://t.co/dKP3o1e --><meta name="HandheldFriendly" content="True"><meta name="MobileOptimized" content="320"><meta name="viewport" content="width=device-width, initial-scale=1.0"> <script> document.documentElement.className = document.documentElement.className.replace(/\bno-js\b/g, '') + ' js '; </script> <!-- For all browsers --><link rel="stylesheet" href="https://qinxin-yan.github.io/assets/css/main.css"><meta http-equiv="cleartype" content="on"> <!-- start custom head snippets --> <!-- favicon from https://commons.wikimedia.org/wiki/File:OOjs_UI_icon_academic-progressive.svg --><link rel="apple-touch-icon" sizes="180x180" href="https://qinxin-yan.github.io/images/apple-touch-icon-180x180.png"/><link rel="icon" type="image/svg+xml" href="https://qinxin-yan.github.io/images/favicon.svg"/><link rel="icon" type="image/png" href="https://qinxin-yan.github.io/images/favicon-32x32.png" sizes="32x32"/><link rel="icon" type="image/png" href="https://qinxin-yan.github.io/images/favicon-192x192.png" sizes="192x192"/><link rel="manifest" href="https://qinxin-yan.github.io/images/manifest.json"/><link rel="icon" href="/images/favicon.ico"/><meta name="theme-color" content="#ffffff"/><link rel="stylesheet" href="https://qinxin-yan.github.io/assets/css/academicons.css"/><link rel="stylesheet" href="https://qinxin-yan.github.io/assets/css/cosmic-sociology.css"/> <!-- Support for MatJax --> <script src="https://cdnjs.cloudflare.com/polyfill/v3/polyfill.min.js?features=es6"></script> <script id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script> <!-- end custom head snippets --></head><body> <!--[if lt IE 9]><div class="notice--danger align-center" style="margin: 0;">You are using an <strong>outdated</strong> browser. 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