Namely, the following one



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> "All problems appeared once in the [American Mathematical] *Monthly*."
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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](https://mathoverflow.net/users/11260/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.



What is the source of this E̶r̶d̶ő̶s̶ quote?
In [Index to Mathematical Problems, 1980-1984 - Page xi](http://books.google.de/books?id=n-F52zK2UAgC&pg=PR11&dq=%22all%20%20problems%22%20%20%22american%20mathematical%20monthly%22&hl=en&sa=X&ei=n0ZqUrn0JYLWtAa3roDwDw&redir_esc=y#v=onepage&q=%22all%20%20problems%22%20%20%22american%20mathematical%20monthly%22&f=false) 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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> 


