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What is the meaning of the expression Q. E. D. ? Is it similar to . . . 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 Some authors use Q E D as that mark, some authors use the box
What are the advantages of ending a proof with “QED”? QED is short for the Latin phrase quod erat demonstrandum and means, loosely, "that which was to be shown" As noted in the comments, it's a summary way of saying that the proof is concluded
以「Q. E. D」收尾证明语段，是什么梗？ - 知乎 (also written QED and QED) is an initialism of the Latin phrase quod erat demonstrandum, meaning "what was to be demonstrated", or, less formally, "thus it has been demonstrated"
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"
Usage of the term Q. E. F. - Mathematics Stack Exchange It's just a phrase, so it should be used where appropriate One "makes" or "does" a construction, and "proves" or "demonstrates" a theorem So, QEF when a construction is finished, and QED when a proof is finished
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 physik uni-kl de filead 。
有没有什么数学证明用的术语的英文或拉丁文？ - 知乎 其实吧，写英语并不一定比中文快多少。不过呢掌握一些基本的术语至少有有利于读书，我记得好像一前见过一本专门介绍这种术语的书，但是忘记名字了。列一些我知道的比较常见的拉丁语： a priori 先验的 以及与之相对的： a posteriori 后验的 a fortiori 这个不算数学术语吧，大概的意思是with the
在数学高考证明题中写下Q. E. D. 可能被判标记卷吗？ - 知乎 众所周知 Q E D 是quite easily done的缩写 挥挥洒洒地终结证明，不经意间注记quite easily done，大佬的高考，往往就是这么朴实无华，且枯燥 而阅卷老师只会在佩服之余，点下满分按钮