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May 19, 2023 at 11:09 comment added Dan Petersen Graeme Segal also attributes this observation to Grothendieck, in the start of Section 2 of "Classifying spaces and spectral sequences". The citation given there is a bit garbled, but he intends to reference "Techniques de construction et théorèmes d’existence en géométrie algébrique III : préschémas quotients", Proposition 4.1.
Feb 25, 2011 at 3:20 history answered Matthew Ando CC BY-SA 2.5