An explicit self-dual construction of complete cotorsion pairs in the relative context
Rendiconti del Seminario Matematico della Università di Padova, Tome 149 (2023), pp. 191-253.
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Let RA be a homomorphism of associative rings, and let (,𝒞) be a hereditary complete cotorsion pair in R-𝖬𝗈𝖽. Let ( A ,𝒞 A ) be the cotorsion pair in A-𝖬𝗈𝖽 in which A is the class of all left A-modules whose underlying R-modules belong to . Assuming that the -resolution dimension of every left R-module is finite and the class is preserved by the coinduction functor Hom R (A,-), we show that 𝒞 A is the class of all direct summands of left A-modules finitely (co)filtered by A-modules coinduced from R-modules from 𝒞. Assuming that the class is closed under countable products and preserved by the functor Hom R (A,-), we prove that 𝒞 A is the class of all direct summands of left A-modules cofiltered by A-modules coinduced from R-modules from 𝒞, with the decreasing filtration indexed by the natural numbers. A combined result, based on the assumption that countable products of modules from have finite -resolution dimension bounded by k, involves cofiltrations indexed by the ordinal ω+k. The dual results also hold, provable by the same technique going back to the author's monograph on semi-infinite homological algebra (2010). In addition, we discuss the n-cotilting and n-tilting cotorsion pairs, for which we obtain better results using a suitable version of a classical Bongartz–Ringel lemma. As an illustration of the main results of the paper, we consider certain cotorsion pairs related to the contraderived and coderived categories of curved DG-modules.

Publié le :
DOI : 10.4171/rsmup/118
Classification : 16, 17
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     author = {Leonid Positselski},
     title = {An explicit self-dual construction of complete cotorsion pairs in the relative context},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {191--253},
     volume = {149},
     year = {2023},
     doi = {10.4171/rsmup/118},
     mrnumber = {4575369},
     zbl = {07688322},
     language = {en},
     url = {http://www.numdam.org/articles/10.4171/rsmup/118/}
}
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Leonid Positselski. An explicit self-dual construction of complete cotorsion pairs in the relative context. Rendiconti del Seminario Matematico della Università di Padova, Tome 149 (2023), pp. 191-253. doi : 10.4171/rsmup/118. http://www.numdam.org/articles/10.4171/rsmup/118/

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