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References to 'modus ponens'
1. beyond formalism: G\"{o}del's incompleteness by gribskoff
2. deductions are $\Delta_1$ by mathcam
3. from Hilbert's tenth problem to G\"{o}del's trichotomy by gribskoff
4. Hilbert's $\varepsilon$-operator by gribskoff
5. interpretation of intuitionistic logic by means of functionals by gribskoff
6. intuitionistic logic by gribskoff
7. logical axiom by CWoo
8. L\"ob's theorem by dankomed
9. propositional calculus by Jon Awbrey
10. reductio ad absurdum by gribskoff
11. the inclusion of classical into intuitionistic logic by gribskoff