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References to 'closure of a subset under relations'
1. abstract family of languages by CWoo
2. category of matrices by rspuzio
3. closure of a relation with respect to a property by CWoo
4. closure of sets closed under a finitary operation by yark
5. closure properties on languages by CWoo
6. completion of a measure space by Koro
7. context-free language by CWoo
8. context-sensitive language by CWoo
9. Cook reduction by Henry
10. deck transformation by mathcam
11. Dedekind-Hasse valuation by Henry
12. definite language by CWoo
13. equivalent condition for being a fundamental system of entourages by mps
14. extending a capacity to a Cartesian product by gel
15. generalized regular expression by CWoo
16. homomorphic image of group by pahio
17. hyperbolic rotation by CWoo
18. imaginary by PrimeFan
19. insertion operation on languages by CWoo
20. intuitionistic logic by gribskoff
21. Jordan-Banach and Jordan-Lie algebras by bci1
22. Lie algebroids by bci1
23. locally testable by CWoo
24. matroid by mps
25. orthogonal morphisms by CWoo
26. Parikh's theorem by CWoo
27. poset by mps
28. quotient of languages by CWoo
29. regular language by mps
30. restricted homomorphism by CWoo
31. reversal by CWoo
32. shuffle of languages by CWoo
33. star-free by CWoo
34. subalgebra of an algebraic system by CWoo
35. subanalytic set by jirka
36. sums of two squares by pahio
37. Tarski-Seidenberg theorem by jirka
38. weak Hopf algebra by bci1
39. weak Hopf C*-algebra by bci1