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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"