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Namely, the following one

"All problems appeared once in the [American Mathematical] Monthly."

I remember reading it several years ago... When I first posed the question, I believed that I had read it somewhere in Krantz' Mathematical Apocrypha but according to Carlo Beenakker the quote is nowhere to be found in the said recollection of stories and anecdotes of Krantz. I gather that Erdős might have expressed it in relation with the history of what is nowadays known as the Sylvester-Gallai theorem but it'd be perfectly possible for me to be wrong in this respect too.

I thank you in advance for your replies.

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FWIW, you can search the book on Google Book here and here. The keyword "Monthly" didn't give me anything remotely similar to the quote though. – Yuichiro Fujiwara Oct 21 '13 at 21:06
it's not in Krantz. – Carlo Beenakker Oct 21 '13 at 21:29
Maybe you read it here: Oh, wait a second.... – Gerry Myerson Oct 21 '13 at 22:47
@Gerry Myerson: Obviously not. Anyway, that must give you an idea of how long I have been trying to remember where I first read this thingy. – José Hdz. Stgo. Oct 23 '13 at 19:06
It would be odd for Erdos to have said this in connection with Sylvester-Gallai, as Erdos published that as a problem in the Monthly, not knowing that Sylvester had published it elsewhere decades earlier. It would have made more sense for him to say, all problems in the Monthly once appeared somewhere else. – Gerry Myerson Oct 25 '13 at 10:26
up vote 16 down vote accepted

In Index to Mathematical Problems, 1980-1984 - Page xi by Stanley Rabinowitz this quote is attributed to Léo Sauvé:

Léo Sauvé, former editor of Crux Mathematicorum, an international problems journal, once quipped that it seemed like all problems "had once been published in the Monthly"

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I like what I read! Last time I edited my question, I thought it would help a lot if I mentioned some other texts which might contain information leading to the whereabouts of the quote in question. Curiously enough, I had intended to include Stan Rabinowitz's Index as one of the top entries in that list... – José Hdz. Stgo. Oct 25 '13 at 16:59

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