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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"
Is $\square$ an alias for QED? - Mathematics Stack Exchange In math, proofs are often accompanied by 'QED' (quod erat demonstrandum) at the end, indicating their conclusion Some authors use a square symbol ($\\square$) instead of QED, with the same meaning
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