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terminology - What is the meaning of the expression Q. E. D. ? Is it . . . Putting QED after that sentence was their way of saying, "and that's what I was trying to prove, so there, I've proved it" We aren't so strict about proofs anymore, but as a practical matter it's very useful to have a definitive mark that indicates the proof is over
What are the advantages of ending a proof with “QED”? As you know “QED” means “quod erat demonstrandum”, that is “what was to be shown” It makes proofs more readable Modern textbooks often conclude proofs with “which concludes the proof” or “which proves the assertion” or something It’s the same thing, “QED” and the square are just convenient shorthands $\endgroup$ –
以「Q. E. D」收尾证明语段，是什么梗？ - 知乎 Quod erat demonstrandum quod - inflected form of relative pronoun, nominative neuter singular of qui, "who, that, which" （用于构成relative clause，和英文类似I am a student who is interested in CS 的who用法差不多，不过英文管这个教attributive clause的时候多一点；quod既是nominative也是accusative，这里是nominative因为以verbal copula sum esse "be"与
Why does drawing $\\square$ mean the end of a proof? I had always used QED (quod erat demonstrandum) at the end of a proof until I was introduced to using Halmos' symbol Since it was a 4-sided symbol, my mind has always associated this "quad" symbol with "quod"
在数学高考证明题中写下Q. E. D. 可能被判标记卷吗？ - 知乎 知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。知乎凭借认真、专业、友善的社区氛围、独特的产品机制以及结构化和易获得的优质内容，聚集了中文互联网科技、商业、影视
Usage of the term Q. E. F. - Mathematics Stack Exchange While researching the term Q E D last night, the phrase Q E F was mentioned, which was apparently "used by Euclid to indicate the end of the justification of a construction" Does Q E F indicate the
Why does proposition 1 in Euclids Elements not end with QEF? Most propositions either end with "QED" or with "QEF", when the first one is used for proving propositions that are not constructions and the second one is for constructions However, in Heath's translation, the first three propositions (in book one) don't end with "QED" or "QEF", but with "Being what it was required to do"
什么是腔量子电动力学？ - 知乎 Cavity QED是一种利用微腔研究光与物质之间相互作用的学科。在微腔中，光子的量子性质会显现出来，在这种极端量子的情况下会出现很多有趣的新物理。很多做冷原子的组也会顺便做一些Cavity QED 最后贴一个入门链接
Is $\square$ an alias for QED? - Mathematics Stack Exchange It is not accurate to say that symbol $\square$ has the same meaning as QED It is simply a marker for the end of a proof, while QED is an actual statement that the proof is complete It is simply a marker for the end of a proof, while QED is an actual statement that the proof is complete