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References to 'matrix operations'
1. additive category by CWoo
2. category of matrices by rspuzio
3. chain rule (several variables) by rmilson
4. derivation of 2D reflection matrix by stevecheng
5. determinant by rmilson
6. dyad product by pahio
7. example of Banach algebra which is not a $C^*$-algebra for any involution by asteroid
8. examples of groups by AxelBoldt
9. examples of non-commutative operations by yark
10. examples of rings by matte
11. examples of semigroups by CWoo
12. frame by rmilson
13. generalized matrix ring by mclase
14. graph-theoretic representation of relation composition by Jon Awbrey
15. groupoid and group representations related to quantum symmetries by bci1
16. hollow matrix rings by Algeboy
17. identity matrix by mathcam
18. Jacobian and chain rule by pahio
19. least squares by akrowne
20. linear algebra by rmilson
21. matrix characterizations of automata by CWoo
22. matrix representation of a linear transformation by CWoo
23. matrix representation of relation composition by Jon Awbrey
24. matrix ring by CWoo
25. monomial matrix by GrafZahl
26. Morita equivalence by CWoo
27. permutation matrix by Wkbj79
28. perspective drawing by stevecheng
29. physical vector by rmilson
30. proof of properties of trace of a matrix by Daume
31. quantum operator algebras in quantum field theories by bci1
32. relation composition by Jon Awbrey
33. Smith normal form by Mathprof
34. Stern-Brocot tree by bbukh
35. theory from orders of classical groups by Algeboy
36. topological transformation group by CWoo
37. two isomorphic groups by Wkbj79
38. unimodular matrix by CWoo
39. vector by rmilson
40. zero ring by Wkbj79