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What is the meaning of the expression Q. E. D. ? Is it similar to . . . It's an abbreviation of quod erat demonstrandum, which is the Latin translation of a Greek phrase meaning "which had to be proven" To the ancient Greeks, a proof wasn't complete unless the last sentence in your proof was basically the statement of the theorem 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
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"
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
Why does drawing $\square$ mean the end of a proof? 0 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"