Maintaining a contemporary perspective, this strongly algebraic-oriented text provides a concrete and readable text for the traditional course in elementary differential equations that science, engineering, and mathematics readers take following calculus. Matters of definition, classification, and logical structure deserve (and receive here) careful attention for the first time in the mathematical experience of many of the readers. While it is neither feasible nor desirable to include proofs of the fundamental existence and uniqueness theorems along the way in an elementary course, readers need to see precise and clear-cut statements of these theorems, and understand their role in the subject. Appropriate existence and uniqueness proofs in the Appendix are included, and referred to where appropriate in the main body of the text. Applications are highlighted throughout the text. These include: What explains the commonly observed lag time between indoor and outdoor daily temperature oscillations?; What makes the difference between doomsday and extinction in alligator populations?; How do a unicycle and a two-axle car react differently to road bumps?; Why are flagpoles hollow instead of solid?; Why might an earthquake demolish one building and leave standing the one next door?; How can you predict the time of next perihelion passage of a newly observed comet?; Why and when does non-linearity lead to chaos in biological and mechanical systems?; What explains the difference in the sounds of a guitar, a xylophone, and a drum? Includes almost 300 computer-generated graphics throughout the text. This text, with enough material for 2 terms, provides a concrete and readable text for the traditional course in elementary differential equations that science, engineering, and mathematics readers take following calculus.
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我必须承认,这本书的深度是需要投入时间的。它绝不是那种可以快速翻阅、囫囵吞枣的读物。那些需要严密逻辑推理的部分,比如证明过程,要求读者必须集中注意力,逐步推导。但我认为,这种“挑战性”恰恰是它的价值所在。它不提供廉价的答案,而是培养你独立思考和进行数学推导的能力。书中提供的理论证明是完整且无可挑剔的,这对于建立扎实的数学思维至关重要。我发现,每当我攻克书中一个比较困难的定理证明后,都会有一种强烈的成就感,这种感觉是做几道简单题所无法比拟的。这本书的作者在数学的严谨性和教学的实用性之间拿捏得非常到位,它既满足了数学系学生对完备性的要求,又兼顾了工程背景学生对解决实际问题的需求,是一种非常高级的平衡艺术。
评分这本教材的排版和印刷质量相当不错,纸张的触感很舒服,长时间阅读也不会感到眼睛疲劳。装订也很结实,感觉能扛得住我这种频繁翻阅的“折磨”。内容结构上,作者的处理方式非常清晰,从最基础的概念入手,循序渐进地引导读者进入微分方程的殿堂。特别是对初学者而言,书中提供的那些详尽的例子和步骤分解,简直是救星。我记得有一次在处理一个复杂的拉普拉斯变换问题时,书里的一个例题几乎就是我的解题模板,让我豁然开朗。而且,书中对理论的阐述绝不含糊,既保证了数学的严谨性,又不会让非数学专业的学生望而却步。章节之间的逻辑衔接非常自然,仿佛是在进行一场精心设计的导览,每走一步都能看到新的风景,而不是生硬的知识堆砌。那些穿插在正文中的历史小注和实际应用案例,更是锦上添花,让原本抽象的数学概念鲜活了起来,让我能更好地理解“为什么要学这个”。总的来说,从物理层面到视觉体验,这本书都展现出了极高的专业水准,让人爱不释手。
评分这本书最大的亮点之一,在于它对各种解法进行了系统而全面的梳理和比较。很多教材只介绍“如何解”,但这本书更进一步,会讨论不同方法的适用范围、优缺点以及计算复杂度。比如,在处理常微分方程组时,它不仅详细讲解了矩阵指数法,还对比了数值逼近法的优势,这对于我后续进行数值模拟的工作大有裨益。此外,书中对边值问题和傅里叶级数的讲解,清晰得令人赞叹。作者似乎深知读者在学习傅里叶展开时容易在哪里卡住,因此特地用好几页篇幅来解释收敛性的意义,而不是简单地给出一个公式。这种前瞻性的教学设计,极大地减少了我在自学过程中可能遇到的挫折感。我尤其欣赏它在引入新概念时,总是会先回顾相关的背景知识,确保读者没有遗漏任何必要的铺垫,构建起了一个非常坚固的知识框架。
评分从工具书的角度来看,这本书的索引和附录部分设计得非常人性化。当我需要快速回顾某个特定公式或定理时,可以毫不费力地找到它所在的位置。附录中对常数和特殊函数的总结,也为我查阅资料节省了大量时间,这在期末复习或者赶项目报告时显得尤为重要。再者,书中对“物理背景”的描述,虽然篇幅不占主导,但选取得极其精准。它没有陷入繁琐的物理推导,而是用最简洁的语言点明了数学模型所代表的物理意义——比如热传导、振动系统等。这种“以小见大”的方式,让我意识到微分方程不仅仅是抽象的代数运算,更是描述我们周围世界的强大语言。总而言之,这是一本值得反复研读的经典教材,其价值远超出了课本本身的范畴,更像是一位沉默的、耐心的导师。
评分坦白说,我最初拿到这本书时,内心是有些抗拒的,毕竟“微分方程”这四个字听起来就让人头皮发麻。然而,这本书的叙述风格却出乎意料地“接地气”。作者仿佛是一位经验丰富的老教授,他不会直接扔给你一堆公式然后让你自己琢磨。相反,他会用一种非常口语化,但又不失学术深度的语言来解释每一个定理背后的直觉意义。举个例子,关于稳定性分析那一部分,我以前总觉得很玄乎,但书里引入的那个关于“小扰动”的形象比喻,一下子就击中了我。它把复杂的相平面分析具象化了,让我明白了为什么某些解会趋于平衡点,而另一些会发散。书中提供的习题难度梯度设置得非常巧妙,基础练习夯实了基本功,而后面的挑战题则足够让我绞尽脑汁,真正体会到解决问题的乐趣。对于那些想深入研究应用数学的同学来说,这本书提供的深度是远远超过一般入门教材的,它在基础和前沿之间找到了一个绝佳的平衡点。
评分This book is pretty good and full of theories, but I don't like the format very much; I think it is not concise enough. Sometimes the proofs are just too long to read- -
评分This book is pretty good and full of theories, but I don't like the format very much; I think it is not concise enough. Sometimes the proofs are just too long to read- -
评分This book is pretty good and full of theories, but I don't like the format very much; I think it is not concise enough. Sometimes the proofs are just too long to read- -
评分This book is pretty good and full of theories, but I don't like the format very much; I think it is not concise enough. Sometimes the proofs are just too long to read- -
评分This book is pretty good and full of theories, but I don't like the format very much; I think it is not concise enough. Sometimes the proofs are just too long to read- -
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