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Timeline for Relative and absolute Ext groups

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Apr 7, 2022 at 16:30 comment added user164898 For #1, sure, it's the spectral sequence for change of allowable class. Relative Ext groups and absolute Ext groups are both cases of Ext groups relative to an allowable class: for this, see Mac Lane "Homology" chapter IX. The Ext spectral sequence induced by change of allowable class appears in Prop. 4.1 of tandfonline.com/doi/full/10.1080/00927872.2015.1085995 (arxiv version here: arxiv.org/abs/1501.01389v1 ) but probably also in other places, since it's a straightforward construction.
Apr 7, 2022 at 13:59 answer added Tyler Lawson timeline score: 3
Apr 7, 2022 at 8:49 answer added Mark Grant timeline score: 2
Apr 7, 2022 at 1:34 history asked Piotr Pstrągowski CC BY-SA 4.0