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References to 'comprehension axiom'
1. $ACA_0$ by Henry
2. $RCA_0$ by Henry
3. $Z_2$ by Henry
4. an outline of Hilbert's programme by gribskoff
5. bibliography for differential geometry by archibal
6. circular helix by rspuzio
7. class by yark
8. differential geometry by rspuzio
9. digital object by CWoo
10. empty set by djao
11. general system definitions by bci1
12. geometry by rspuzio
13. Greibach normal form by CWoo
14. groupoid C*-dynamical system by bci1
15. Hilbert's $\varepsilon$-operator by gribskoff
16. IF-logic by mathcam
17. Java by PrimeFan
18. Kahun Papyrus and Arithmetic Progressions by milogardner
19. lambda calculus by ratboy
20. Lie algebras from other algebras by Algeboy
21. magic circles by drini
22. molecular set theory by bci1
23. permutation model by ratboy
24. pi by mathcam
25. predicativism by gribskoff
26. regular expression by CWoo
27. Russell's theory of types by Aatu
28. set by Mathprof
29. summation by drini
30. tensor by rmilson
31. tensor product (vector spaces) by rmilson
32. topos by CWoo
33. unit disc by PrimeFan
34. von Neumann-Bernays-G\"odel set theory by Aatu