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Jan 14, 2016 at 5:51 history edited Qiaochu Yuan CC BY-SA 3.0
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Jan 13, 2016 at 5:38 history edited Qiaochu Yuan CC BY-SA 3.0
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Jan 13, 2016 at 5:03 comment added Qiaochu Yuan Tsemo's example is the short exact sequence $1 \to \mathbb{Z} \xrightarrow{n} \mathbb{Z} \to \mathbb{Z}/n \to 1$ which also does not split.
Jan 13, 2016 at 2:25 history edited Qiaochu Yuan CC BY-SA 3.0
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Jan 13, 2016 at 2:09 history edited Qiaochu Yuan CC BY-SA 3.0
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Jan 13, 2016 at 2:06 vote accept Shiquan Ren
Jan 13, 2016 at 1:50 history answered Qiaochu Yuan CC BY-SA 3.0