<?xml version="1.0" encoding="UTF-8"?><?xml-stylesheet href="/rss.xsl" type="text/xsl"?><rss version="2.0"><channel><title>Entropy</title><description>A dev blog.</description><link>https://entropy.lighterever.com/</link><language>zh_CN</language><copyright>Copyright 2026 Lighterever</copyright><generator>Astro</generator><image><url>https://entropy.lighterever.com/favicon/favicon.png</url><title>Entropy</title><link>https://entropy.lighterever.com/</link></image><item><title>极限、函数与连续</title><link>https://entropy.lighterever.com/posts/%E6%9E%81%E9%99%90%E3%80%81%E5%87%BD%E6%95%B0%E4%B8%8E%E8%BF%9E%E7%BB%AD/</link><guid isPermaLink="true">https://entropy.lighterever.com/posts/%E6%9E%81%E9%99%90%E3%80%81%E5%87%BD%E6%95%B0%E4%B8%8E%E8%BF%9E%E7%BB%AD/</guid><description>极限、函数与连续总览：题型一剖析函数极限——不定式 7 种类型，利用基本极限、等价无穷小替换、L&apos;Hospital 法则、Taylor 公式、导数定义的求法与易错点</description><pubDate>Wed, 30 Sep 2026 12:00:00 GMT</pubDate><category>实战笔记</category><category>高等数学</category><category>CMC</category><category>待完善</category><author>Lighterever</author></item><item><title>三角恒等变换</title><link>https://entropy.lighterever.com/posts/%E4%B8%89%E8%A7%92%E6%81%92%E7%AD%89%E5%8F%98%E6%8D%A2/</link><guid isPermaLink="true">https://entropy.lighterever.com/posts/%E4%B8%89%E8%A7%92%E6%81%92%E7%AD%89%E5%8F%98%E6%8D%A2/</guid><description>CMC 备考·三角恒等变换：和差角公式、二倍角、升降幂、半角、万能代换（t=tan(x/2)）、积化和差</description><pubDate>Wed, 30 Sep 2026 00:00:00 GMT</pubDate><category>学习笔记</category><category>高等数学</category><author>Lighterever</author></item><item><title>两个重要极限</title><link>https://entropy.lighterever.com/posts/%E4%B8%A4%E4%B8%AA%E9%87%8D%E8%A6%81%E6%9E%81%E9%99%90/</link><guid isPermaLink="true">https://entropy.lighterever.com/posts/%E4%B8%A4%E4%B8%AA%E9%87%8D%E8%A6%81%E6%9E%81%E9%99%90/</guid><description>两个重要极限（sinx/x=1 与 (1+x)^(1/x)=e）</description><pubDate>Wed, 30 Sep 2026 00:00:00 GMT</pubDate><category>学习笔记</category><category>高等数学</category><author>Lighterever</author></item><item><title>导数</title><link>https://entropy.lighterever.com/posts/%E5%AF%BC%E6%95%B0/</link><guid isPermaLink="true">https://entropy.lighterever.com/posts/%E5%AF%BC%E6%95%B0/</guid><description>一元函数微分学核心：导数定义与几何意义、可导可微连续关系、求导法则与高阶导数、微分中值定理（罗尔/拉格朗日/柯西）、竞赛构造辅助函数技巧</description><pubDate>Wed, 30 Sep 2026 00:00:00 GMT</pubDate><category>学习笔记</category><category>高等数学</category><author>Lighterever</author></item><item><title>泰勒展开</title><link>https://entropy.lighterever.com/posts/%E6%B3%B0%E5%8B%92%E5%B1%95%E5%BC%80/</link><guid isPermaLink="true">https://entropy.lighterever.com/posts/%E6%B3%B0%E5%8B%92%E5%B1%95%E5%BC%80/</guid><description>Taylor 公式（泰勒展开）：六大标准展开式、拉格朗日余项与展开阶数判断</description><pubDate>Wed, 30 Sep 2026 00:00:00 GMT</pubDate><category>学习笔记</category><category>高等数学</category><author>Lighterever</author></item><item><title>洛必达法则</title><link>https://entropy.lighterever.com/posts/%E6%B4%9B%E5%BF%85%E8%BE%BE%E6%B3%95%E5%88%99/</link><guid isPermaLink="true">https://entropy.lighterever.com/posts/%E6%B4%9B%E5%BF%85%E8%BE%BE%E6%B3%95%E5%88%99/</guid><description>L&apos;Hospital 法则（洛必达）：适用条件、7 种不定式如何化为 0/0 与 ∞/∞ 基本型、开洛前变形与分离因子的实践要点，以及与 Heine 定理的配合</description><pubDate>Wed, 30 Sep 2026 00:00:00 GMT</pubDate><category>学习笔记</category><category>高等数学</category><author>Lighterever</author></item><item><title>海涅定理</title><link>https://entropy.lighterever.com/posts/%E6%B5%B7%E6%B6%85%E5%AE%9A%E7%90%86/</link><guid isPermaLink="true">https://entropy.lighterever.com/posts/%E6%B5%B7%E6%B6%85%E5%AE%9A%E7%90%86/</guid><description>Heine 定理（海涅 / 归结原理）：函数极限与数列极限互化的充要条件，常用于把 f(x) 的极限转化为子数列极限</description><pubDate>Wed, 30 Sep 2026 00:00:00 GMT</pubDate><category>学习笔记</category><category>高等数学</category><author>Lighterever</author></item><item><title>等价无穷小替换</title><link>https://entropy.lighterever.com/posts/%E7%AD%89%E4%BB%B7%E6%97%A0%E7%A9%B7%E5%B0%8F%E6%9B%BF%E6%8D%A2/</link><guid isPermaLink="true">https://entropy.lighterever.com/posts/%E7%AD%89%E4%BB%B7%E6%97%A0%E7%A9%B7%E5%B0%8F%E6%9B%BF%E6%8D%A2/</guid><description>常用等价无穷小公式表（x→0），及&quot;只能在乘除中替换、加减中谨慎&quot;的使用注意</description><pubDate>Wed, 30 Sep 2026 00:00:00 GMT</pubDate><category>学习笔记</category><category>高等数学</category><author>Lighterever</author></item><item><title>裂项相消</title><link>https://entropy.lighterever.com/posts/%E8%A3%82%E9%A1%B9%E7%9B%B8%E6%B6%88/</link><guid isPermaLink="true">https://entropy.lighterever.com/posts/%E8%A3%82%E9%A1%B9%E7%9B%B8%E6%B6%88/</guid><description>裂项相消的核心思想与常见模式：分式型、根式型（分子有理化）、指数型、阶乘型、三角裂项</description><pubDate>Wed, 30 Sep 2026 00:00:00 GMT</pubDate><category>学习笔记</category><category>高等数学</category><author>Lighterever</author></item><item><title>Spring框架基础-IoC与AOP</title><link>https://entropy.lighterever.com/posts/Spring%E6%A1%86%E6%9E%B6%E5%9F%BA%E7%A1%80-IoC%E4%B8%8EAOP/</link><guid isPermaLink="true">https://entropy.lighterever.com/posts/Spring%E6%A1%86%E6%9E%B6%E5%9F%BA%E7%A1%80-IoC%E4%B8%8EAOP/</guid><description>Spring 概述（核心思想、两大特征、模块）、控制反转 IoC 与依赖注入 DI（容器、Bean、装配方式、生命周期）、面向切面编程 AOP（切面、通知、切入点、注解与XML 用法）</description><pubDate>Sun, 20 Sep 2026 22:00:00 GMT</pubDate><category>学习笔记</category><category>后端开发技术</category><category>课程笔记</category><category>复习</category><category>\*</category><author>Lighterever</author></item><item><title>晶体管、反相器、逻辑代数基本定理与规则</title><link>https://entropy.lighterever.com/posts/%E6%99%B6%E4%BD%93%E7%AE%A1%E3%80%81%E5%8F%8D%E7%9B%B8%E5%99%A8%E3%80%81%E9%80%BB%E8%BE%91%E4%BB%A3%E6%95%B0%E5%9F%BA%E6%9C%AC%E5%AE%9A%E7%90%86%E4%B8%8E%E8%A7%84%E5%88%99/</link><guid isPermaLink="true">https://entropy.lighterever.com/posts/%E6%99%B6%E4%BD%93%E7%AE%A1%E3%80%81%E5%8F%8D%E7%9B%B8%E5%99%A8%E3%80%81%E9%80%BB%E8%BE%91%E4%BB%A3%E6%95%B0%E5%9F%BA%E6%9C%AC%E5%AE%9A%E7%90%86%E4%B8%8E%E8%A7%84%E5%88%99/</guid><description>数字逻辑基础：真值表与三种基本运算、NMOS/PMOS 晶体管工作原理、CMOS 反相器、OC 门（集电极开路）、逻辑代数的基本定律与三个规则（代入/反演/对偶）、摩根定律</description><pubDate>Sun, 20 Sep 2026 22:00:00 GMT</pubDate><category>学习笔记</category><category>数字逻辑</category><category>课程笔记</category><category>复习</category><author>Lighterever</author></item><item><title>HTML基础</title><link>https://entropy.lighterever.com/posts/HTML%E5%9F%BA%E7%A1%80/</link><guid isPermaLink="true">https://entropy.lighterever.com/posts/HTML%E5%9F%BA%E7%A1%80/</guid><description>HTML 文档结构、文本/列表/超链接/表格/图像/多媒体/表单标签、DIV+CSS 布局、注释与特殊字符</description><pubDate>Sun, 13 Sep 2026 00:00:00 GMT</pubDate><category>学习笔记</category><category>前端开发技术</category><category>课程笔记</category><category>html</category><author>Lighterever</author></item><item><title>递归与分治策略</title><link>https://entropy.lighterever.com/posts/%E9%80%92%E5%BD%92%E4%B8%8E%E5%88%86%E6%B2%BB%E7%AD%96%E7%95%A5/</link><guid isPermaLink="true">https://entropy.lighterever.com/posts/%E9%80%92%E5%BD%92%E4%B8%8E%E5%88%86%E6%B2%BB%E7%AD%96%E7%95%A5/</guid><description>递归的基本概念、经典递归案例（阶乘/Fibonacci/Hanoi）、递归优缺点与优化、分治思想、归并排序、主定理复杂度分析、二分查找、快速排序、快速选择、堆排序与分治进阶案例（最近点对/整数相乘/矩阵相乘）</description><pubDate>Wed, 16 Sep 2026 17:00:00 GMT</pubDate><category>学习笔记</category><category>算法设计与分析</category><category>课程笔记</category><category>每周复盘</category><author>Lighterever</author></item><item><title>数据库原理基本概念</title><link>https://entropy.lighterever.com/posts/%E6%95%B0%E6%8D%AE%E5%BA%93%E5%8E%9F%E7%90%86%E5%9F%BA%E6%9C%AC%E6%A6%82%E5%BF%B5/</link><guid isPermaLink="true">https://entropy.lighterever.com/posts/%E6%95%B0%E6%8D%AE%E5%BA%93%E5%8E%9F%E7%90%86%E5%9F%BA%E6%9C%AC%E6%A6%82%E5%BF%B5/</guid><description>DBMS 及数据库逻辑结构、数据模型、概念模型(E-R)核心概念</description><pubDate>Sun, 13 Sep 2026 00:00:00 GMT</pubDate><category>学习笔记</category><category>数据库原理</category><category>课程笔记</category><category>复习</category><author>Lighterever</author></item><item><title>行列式的展开：余子式与代数余子式</title><link>https://entropy.lighterever.com/posts/%E8%A1%8C%E5%88%97%E5%BC%8F%E7%9A%84%E5%B1%95%E5%BC%80%E4%B8%8E%E4%BD%99%E5%AD%90%E5%BC%8F/</link><guid isPermaLink="true">https://entropy.lighterever.com/posts/%E8%A1%8C%E5%88%97%E5%BC%8F%E7%9A%84%E5%B1%95%E5%BC%80%E4%B8%8E%E4%BD%99%E5%AD%90%E5%BC%8F/</guid><description>余子式与代数余子式的区别、行列式按行列展开定理及异乘变零推论的证明、降阶法/加边法/数学归纳法与范德蒙德、行和相等型与爪型行列式</description><pubDate>Wed, 16 Sep 2026 22:00:00 GMT</pubDate><category>学习笔记</category><category>线性代数</category><category>课程笔记</category><category>复习</category><author>Lighterever</author></item><item><title>数制、编码与逻辑门</title><link>https://entropy.lighterever.com/posts/%E6%95%B0%E5%88%B6%E3%80%81%E7%BC%96%E7%A0%81%E4%B8%8E%E9%80%BB%E8%BE%91%E9%97%A8/</link><guid isPermaLink="true">https://entropy.lighterever.com/posts/%E6%95%B0%E5%88%B6%E3%80%81%E7%BC%96%E7%A0%81%E4%B8%8E%E9%80%BB%E8%BE%91%E9%97%A8/</guid><description>基础概念、进制转换、BCD码、格雷码、原反补码、逻辑门、三态门、OC门</description><pubDate>Sun, 13 Sep 2026 00:00:00 GMT</pubDate><category>学习笔记</category><category>数字逻辑</category><category>课程笔记</category><category>复习</category><author>Lighterever</author></item><item><title>软件架构/框架/中间件/构件</title><link>https://entropy.lighterever.com/posts/%E8%BD%AF%E4%BB%B6%E6%9E%B6%E6%9E%84:%E6%A1%86%E6%9E%B6:%E4%B8%AD%E9%97%B4%E4%BB%B6:%E6%9E%84%E4%BB%B6/</link><guid isPermaLink="true">https://entropy.lighterever.com/posts/%E8%BD%AF%E4%BB%B6%E6%9E%B6%E6%9E%84:%E6%A1%86%E6%9E%B6:%E4%B8%AD%E9%97%B4%E4%BB%B6:%E6%9E%84%E4%BB%B6/</guid><description>软件架构/框架/中间件/构件的区别</description><pubDate>Sun, 13 Sep 2026 00:00:00 GMT</pubDate><category>学习笔记</category><category>后端开发技术</category><category>课程笔记</category><author>Lighterever</author></item><item><title>线性回归</title><link>https://entropy.lighterever.com/posts/%E7%BA%BF%E6%80%A7%E5%9B%9E%E5%BD%92/</link><guid isPermaLink="true">https://entropy.lighterever.com/posts/%E7%BA%BF%E6%80%A7%E5%9B%9E%E5%BD%92/</guid><description>线性回归完整推导：模型假设、最小二乘目标函数、梯度下降 LMS 规则、矩阵迹性质、正则化（Ridge/LASSO）与过拟合治理</description><pubDate>Wed, 16 Sep 2026 17:30:00 GMT</pubDate><category>学习笔记</category><category>机器学习</category><category>课程笔记</category><category>复习</category><category>\*</category><author>Lighterever</author></item><item><title>行列式定义与基本性质</title><link>https://entropy.lighterever.com/posts/%E8%A1%8C%E5%88%97%E5%BC%8F%E5%AE%9A%E4%B9%89%E4%B8%8E%E5%9F%BA%E6%9C%AC%E6%80%A7%E8%B4%A8/</link><guid isPermaLink="true">https://entropy.lighterever.com/posts/%E8%A1%8C%E5%88%97%E5%BC%8F%E5%AE%9A%E4%B9%89%E4%B8%8E%E5%9F%BA%E6%9C%AC%E6%80%A7%E8%B4%A8/</guid><description>核心问题：</description><pubDate>Wed, 09 Sep 2026 15:29:21 GMT</pubDate><category>学习笔记</category><category>线性代数</category><category>课程笔记</category><author>Lighterever</author></item><item><title>机器学习基础概论与课程介绍</title><link>https://entropy.lighterever.com/posts/%E6%9C%BA%E5%99%A8%E5%AD%A6%E4%B9%A0%E5%9F%BA%E7%A1%80%E6%A6%82%E8%AE%BA%E4%B8%8E%E8%AF%BE%E7%A8%8B%E4%BB%8B%E7%BB%8D/</link><guid isPermaLink="true">https://entropy.lighterever.com/posts/%E6%9C%BA%E5%99%A8%E5%AD%A6%E4%B9%A0%E5%9F%BA%E7%A1%80%E6%A6%82%E8%AE%BA%E4%B8%8E%E8%AF%BE%E7%A8%8B%E4%BB%8B%E7%BB%8D/</guid><description>机器学习第一课：科学研究范式的演进、机器学习的定义与要素、算法分类、数学基础与学习资源</description><pubDate>Wed, 16 Sep 2026 17:15:00 GMT</pubDate><category>学习笔记</category><category>机器学习</category><category>课程笔记</category><author>Lighterever</author></item><item><title>算法概述</title><link>https://entropy.lighterever.com/posts/%E7%AE%97%E6%B3%95%E6%A6%82%E8%BF%B0/</link><guid isPermaLink="true">https://entropy.lighterever.com/posts/%E7%AE%97%E6%B3%95%E6%A6%82%E8%BF%B0/</guid><description>算法定义与五大特性、算法的描述方式、算法复杂性分析（渐近记号O/Ω/θ/o）、NP完全性理论、算法设计策略与算法性质</description><pubDate>Wed, 09 Sep 2026 00:00:00 GMT</pubDate><category>学习笔记</category><category>算法设计与分析</category><category>课程笔记</category><author>Lighterever</author></item><item><title>Web的初探</title><link>https://entropy.lighterever.com/posts/Web%E7%9A%84%E5%88%9D%E6%8E%A2/</link><guid isPermaLink="true">https://entropy.lighterever.com/posts/Web%E7%9A%84%E5%88%9D%E6%8E%A2/</guid><description>(Fn) F12: 打开DevToolsElements: 查看此页面的源代码（html、JS），可以在这里找到很多线索，比如JS的一些轮询地址可以通过ctrl+F来寻找关键词，比如藏在注释里的key注释形式是 &lt;!-- --&gt;（HTML注释）和 // 或 /* */（JS注释）Sources: 可以看 JS 源码、设断点调试，CTF 里经常用来分析前端逻辑Console: 一个“作弊器”，在这里可以运行JS(javascript)，用脚本操作网页Network: 关于网页连接，可以看url、路径、header(可能藏flag哦)Application: 重点是在这看cookies，比如可以篡改user的权限为admin，来拿到隐藏的权限或页面</description><pubDate>Thu, 03 Sep 2026 00:00:00 GMT</pubDate><category>实战笔记</category><category>ctf</category><category>web</category><author>Lighterever</author></item><item><title>Linux系统基本命令&amp;找明文flag</title><link>https://entropy.lighterever.com/posts/%E5%85%B3%E4%BA%8ELinux%E7%B3%BB%E7%BB%9F%E5%9F%BA%E6%9C%AC-%E6%89%BE%E6%98%8E%E6%96%87flag/</link><guid isPermaLink="true">https://entropy.lighterever.com/posts/%E5%85%B3%E4%BA%8ELinux%E7%B3%BB%E7%BB%9F%E5%9F%BA%E6%9C%AC-%E6%89%BE%E6%98%8E%E6%96%87flag/</guid><description>前情提要:此处仅记录个人在学习/练习/比赛中感觉较为重要的命令，更基本/详细的命令不作记录，请移步：Linuxbase_tecmint</description><pubDate>Thu, 03 Sep 2026 00:00:00 GMT</pubDate><category>实战笔记</category><category>linux</category><category>ctf</category><author>Lighterever</author></item></channel></rss>