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Vanilla 1.1.10 is a product of Lussumo. More Information: Documentation, Community Support.
added a little bit more to split exact sequence.
Added statement and proof of the little lemma that an SES with first object injective splits.
Yes, you’re certainly right, Guest. (Or at least right if the axiom of choice is assumed.) I don’t know what the author may have been thinking.
I’ll fix this.
Elías:
There is a typo in the proof of Lemma 1.2. The last sentence should be “the implication that the first condition also implies the third (…)”
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