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References to 'set difference'
1. axiom schema of separation by Sabean
2. closed set in a subspace by yark
3. closure properties on languages by CWoo
4. complement by CWoo
5. concepts in set theory by matte
6. context-free language by CWoo
7. derived Boolean operations by CWoo
8. direct image by djao
9. equation by pahio
10. examples of locally compact and not locally compact spaces by AxelBoldt
11. Hilbert's $\varepsilon$-operator by gribskoff
12. hyperbolic angle by CWoo
13. index of set theory by rspuzio
14. inverse image by djao
15. linearly independent by rmilson
16. locale by CWoo
17. matrix representation of relation composition by Jon Awbrey
18. neutrosophic set by para0doxa
19. ordinal arithmetic by Henry
20. perfect ruler by mathcam
21. properties of set difference by CWoo
22. regular language by mps
23. relation theory by Jon Awbrey
24. set by Mathprof
25. the inverse image commutes with set operations by matte
26. transfinite recursion by CWoo
27. von Neumann-Bernays-G\"odel set theory by Aatu