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Alexander Grothendieck's life and work is full of the wonders.

As far as I know Grothendieck largely decreased his mathematical activity after 1970 and became retired in 1988. However there are rumors about his private works and unpublished papers after 1970. Also there are strange rumors about some of his papers with pseudonymous names mainly between 1970-88 and even after it. For the first time I have heard about this in a free discussion in a model theory and algebraic geometry conference.

Question: Is it really true? Does Grothendieck have any pseudonymous paper? If yes, please introduce some references.

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    $\begingroup$ Not voting to close because I am too curious. :P $\endgroup$ – darij grinberg May 6 '14 at 2:02
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    $\begingroup$ You may want to take a look at this text. Thanks for letting me know of you catch other typos. $\endgroup$ – Pierre-Yves Gaillard May 6 '14 at 4:05
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    $\begingroup$ Vague and sensationalsit. I really hope this question will stay closed. To be reopened it would need at least some editing to address questions raised in commebts what exactly is asked for. $\endgroup$ – user9072 May 8 '14 at 20:11
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    $\begingroup$ cf. meta.mathoverflow.net/questions/1683/… for why this question has been closed and if whether should be reopened. $\endgroup$ – Joël May 8 '14 at 20:48
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    $\begingroup$ @PeterLeFanuLumsdaine there is a meta thread please use it if you want a reply. $\endgroup$ – user9072 May 9 '14 at 10:03