A dead mathematician co-authored a paper after appearing in a dream: boingboing.net/2021/07/20/a-pe

The paper is "Higher Algebraic $$K$$-Theory of Schemes and of Derived Categories" by Robert Wayne Thomason and Thomas Trobaugh (2007), doi.org/10.1007/978-0-8176-457, ams.org/mathscinet-getitem?mr=

It appears to have been quite an influential one; the MR review calls it a landmark, and it has over 1000 citations on Google Scholar.

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