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Timeline for When are dual modules free?

Current License: CC BY-SA 4.0

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May 12, 2021 at 0:21 history edited David Roberts CC BY-SA 4.0
doi link and human-readable reference added
Jun 27, 2020 at 6:34 comment added sdey The link you gave for the Ext vanishing criteria seems not to be working anymore, so I take the liberty to give the link doi.org/10.1007/BF01229753 (Theorem 2.1)
Jul 10, 2013 at 16:58 history edited Andrew Stacey CC BY-SA 3.0
Fixed maths rendering
Oct 16, 2010 at 18:11 comment added Hailong Dao Dear Greg: your last paragraph sounds very interesting. Would you say a bit more about what you tried to improve?(I like to think a bit about when Ext vanishing implies freeness, that's why I like to hear more about your thoughts)
Nov 8, 2009 at 6:01 history answered Greg Stevenson CC BY-SA 2.5