<?xml version="1.0" encoding="UTF-8"?><rss xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:atom="http://www.w3.org/2005/Atom" version="2.0"><channel><title><![CDATA[RSS Feed]]></title><description><![CDATA[RSS Feed]]></description><link>http://direct.ecency.com</link><image><url>http://direct.ecency.com/logo512.png</url><title>RSS Feed</title><link>http://direct.ecency.com</link></image><generator>RSS for Node</generator><lastBuildDate>Fri, 15 May 2026 11:09:41 GMT</lastBuildDate><atom:link href="http://direct.ecency.com/created/raychaudhuri-equation/rss.xml" rel="self" type="application/rss+xml"/><item><title><![CDATA[[math, computation] Raychaudhuri equation in null geodesic]]></title><description><![CDATA[continue on last posting. In this post we want to derive Raychaudhuri equation for null geodesic. We want to obtain this equation Construction of Null parametrization First let us do Null parametrization]]></description><link>http://direct.ecency.com/math/@beoped/math-computation-raychaudhuri-equation-in-null-geodesic</link><guid isPermaLink="true">http://direct.ecency.com/math/@beoped/math-computation-raychaudhuri-equation-in-null-geodesic</guid><category><![CDATA[math]]></category><dc:creator><![CDATA[beoped]]></dc:creator><pubDate>Tue, 08 Aug 2017 22:18:42 GMT</pubDate><enclosure url="https://images.ecency.com/p/2gsjgna1uruvUuS7ndh9YqVwYGPLVszbFLwwpAYXYXuops6HYUrayXU3aVNmRq39XkVsxvDJGTXFvY6ovu8HYsTQYzrRzTxoquPRouTFUYnfD8JBLS?format=match&amp;mode=fit" length="0" type="false"/></item><item><title><![CDATA[[수학, 계산] Raychaudhuri equation in null geodesic]]></title><description><![CDATA[지난번 포스팅에 이어 Raychaudhuri equation 의 Null version 에 대해 유도해 보려고 합니다. 이 식을 유도하고 싶은 거죠 ㅎㅎ Construction of Null parametrization 먼저 null 매개변수화를 해봅시다. (k: null vector) 여기에 보조 null vector 인 N^a 를 도입합니다. null vector]]></description><link>http://direct.ecency.com/kr-math/@beoped/raychaudhuri-equation-in-null-geodesic</link><guid isPermaLink="true">http://direct.ecency.com/kr-math/@beoped/raychaudhuri-equation-in-null-geodesic</guid><category><![CDATA[kr-math]]></category><dc:creator><![CDATA[beoped]]></dc:creator><pubDate>Tue, 08 Aug 2017 14:46:48 GMT</pubDate><enclosure url="https://images.ecency.com/p/2gsjgna1uruvUuS7ndh9YqVwYGPLVszbFLwwpAYXYXuops6HYUrayXU3aVNmRq39XkVsxvDJGTXFvY6ovu8HYsTQYzrRzTxoquPRouTFUYnfD8JBLS?format=match&amp;mode=fit" length="0" type="false"/></item><item><title><![CDATA[[math, computation] Raychaudhuri equation in time-like geodesic]]></title><description><![CDATA[This is a English version of my former post which was in Korean. Today i wanna discuss the derivation of Raychaudhuri equation which you will encounter this topic when you study about Singularity theorem]]></description><link>http://direct.ecency.com/math/@beoped/math-computation-raychaudhuri-equation-in-time-like-geodesic</link><guid isPermaLink="true">http://direct.ecency.com/math/@beoped/math-computation-raychaudhuri-equation-in-time-like-geodesic</guid><category><![CDATA[math]]></category><dc:creator><![CDATA[beoped]]></dc:creator><pubDate>Tue, 08 Aug 2017 12:46:48 GMT</pubDate><enclosure url="https://images.ecency.com/p/2gsjgna1uruvUuS7ndh9YqVwYGPLVszbFLwwpAYXYXuops6HYUrayXU3aVNmRq39XkVsxvDJGTXFvY6ovu8HYsTQYzrRzTxoquPRouTFUYnfD8JBLS?format=match&amp;mode=fit" length="0" type="false"/></item><item><title><![CDATA[[수학, 계산] Raychaudhuri equation in time-like geodesic]]></title><description><![CDATA[오늘은 블랙홀의 singularity theorem 을 공부하다 보면 만나게 되는 Raychaudhuri equation 의 유도 방법에 대해서 소개해 볼까 합니다. Raychaudhuri [Documentary on Amal Kumar Raychaudhuri, the renowned theoretical physicist from Kolkata] 학계에서도그닥]]></description><link>http://direct.ecency.com/kr-math/@beoped/raychaudhuri-equation-in-time-like-geodesic</link><guid isPermaLink="true">http://direct.ecency.com/kr-math/@beoped/raychaudhuri-equation-in-time-like-geodesic</guid><category><![CDATA[kr-math]]></category><dc:creator><![CDATA[beoped]]></dc:creator><pubDate>Tue, 08 Aug 2017 00:05:39 GMT</pubDate><enclosure url="https://images.ecency.com/p/2gsjgna1uruvUuS7ndh9YqVwYGPLVszbFLwwpAYXYXuops6HYUrayXU3aVNmRq39XkVsxvDJGTXFvY6ovu8HYsTQYzrRzTxoquPRouTFUYnfD8JBLS?format=match&amp;mode=fit" length="0" type="false"/></item></channel></rss>