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    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeSep 27th 2020

    added pointer to:

    • Peter Hilton, Urs Stammbach, Section I.9 in: A course in homological algebra, Springer-Verlag, New York, 1971, Graduate Texts in Mathematics, Vol. 4 (doi, pdf)

    diff, v14, current

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