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References to 'free and bound variables'
1. axiomatizable class by CWoo
2. beyond formalism: G\"{o}del's incompleteness by gribskoff
3. elementary embedding by CWoo
4. example of strongly minimal by CWoo
5. Hilbert's $\varepsilon$-operator by gribskoff
6. many-sorted language by CWoo
7. models constructed from constants by ratboy
8. predicativism by gribskoff
9. quantifier by CWoo
10. row reduction by rmilson
11. satisfaction relation by CWoo
12. Skolemization by Henry
13. subformula by CWoo
14. theory by CWoo
15. universal relation by Henry