Author: Urs Format: MarkdownItexThis entry was odd, in that it claimed one definition (demanding a zero-object) but listed references only for another definition (not demanding a zero object).
I have adjusted wording and added a couple of references.
<a href="https://ncatlab.org/nlab/revision/diff/pre-additive+category/9">diff</a>, <a href="https://ncatlab.org/nlab/revision/pre-additive+category/9">v9</a>, <a href="https://ncatlab.org/nlab/show/pre-additive+category">current</a>
This entry was odd, in that it claimed one definition (demanding a zero-object) but listed references only for another definition (not demanding a zero object).
I have adjusted wording and added a couple of references.