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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
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
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? 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"
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