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References to 'categorical direct sum'
1. $C_1$-category by bci1
2. $C_2$-category by bci1
3. additive category by CWoo
4. Algebraic K-theory by mhale
5. categorical direct product is an inverse limit by archibal
6. category of Hilbert spaces by bci1
7. category theory by archibal
8. compact quantum groupoids related to C*-algebras by bci1
9. counterexamples for products and coproduct by Algeboy
10. diagonal embedding by waj
11. direct products of groups by yark
12. disjoint union by yark
13. disjoint union of categories by CWoo
14. dual category by CWoo
15. duality in mathematics by bci1
16. free product by yark
17. free products and group actions by rm50
18. generalized Schanuel's lemma by CWoo
19. Grassmann-Hopf algebras and coalgebras\gebras by bci1
20. Grassmann-Hopf algebroid categories and Grassmann categories by bci1
21. Grothendieck category by bci1
22. horseshoe lemma by mps
23. index of category theory by rspuzio
24. limit of a functor by CWoo
25. limiting cone by CWoo
26. preorder as a category by CWoo
27. properties of direct product by CWoo
28. supplemental axioms for an Abelian category by archibal
29. universal mapping property by MichaelMcCliment