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I recall reading that some of the mathematical gods of the past said that during proving a claim (or reading the proof of the claim), you really know nothing before you have reached the Q.E.D. sign. What is the exact quote and who is the originator?

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    $\begingroup$ The closest I can think of is Gauss, but he does not mention Q.E.D.:"I mean the word proof not in the sense of the lawyers, who set two half proofs equal to a whole one, but in the sense of a mathematician, where ½ proof = 0, and it is demanded for proof that every doubt becomes impossible." As paraphrased by Holmboe, "one either has to prove all or nothing, as half a proof is worse than no proof." $\endgroup$ – Conifold Jan 6 at 3:21
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    $\begingroup$ Right. Cf. archive.org/stream/p2wilhelmolberss02olbeuoft#page/451/mode/1up/…, where you see "½ Beweis = 0" in a letter from Gauss to Olbers on May 14, 1826. $\endgroup$ – user49915 Jan 6 at 4:23

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