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つづき

and the dual notion of pro-object in
http://archive.numdam.org/ARCHIVE/SB/SB_1958-1960__5_/SB_1958-1960__5__369_0/SB_1958-1960__5__369_0.pdf
A. Grothendieck, Techniques de descente et theoremes d’existence en geometrie algebrique, II: le theoreme d’existence en theorie formelle des modules, Seminaire Bourbaki 195, 1960, (pdf).

https://ncatlab.org/nlab/show/Categories+and+Sheaves
Masaki Kashiwara, Pierre Schapira, section 6 of Categories and Sheaves , Grundlehren der mathematischen Wissenschaften 332 (2006).
(引用終わり)
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