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Mirrors > Home > MPE Home > Th. List > Mathboxes > frege12 | Structured version Visualization version GIF version |
Description: A closed form of com23 86. Proposition 12 of [Frege1879] p. 37. (Contributed by RP, 24-Dec-2019.) (Proof modification is discouraged.) |
Ref | Expression |
---|---|
frege12 | ⊢ ((𝜑 → (𝜓 → (𝜒 → 𝜃))) → (𝜑 → (𝜒 → (𝜓 → 𝜃)))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ax-frege8 43242 | . 2 ⊢ ((𝜓 → (𝜒 → 𝜃)) → (𝜒 → (𝜓 → 𝜃))) | |
2 | frege5 43233 | . 2 ⊢ (((𝜓 → (𝜒 → 𝜃)) → (𝜒 → (𝜓 → 𝜃))) → ((𝜑 → (𝜓 → (𝜒 → 𝜃))) → (𝜑 → (𝜒 → (𝜓 → 𝜃))))) | |
3 | 1, 2 | ax-mp 5 | 1 ⊢ ((𝜑 → (𝜓 → (𝜒 → 𝜃))) → (𝜑 → (𝜒 → (𝜓 → 𝜃)))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 |
This theorem was proved from axioms: ax-mp 5 ax-frege1 43223 ax-frege2 43224 ax-frege8 43242 |
This theorem is referenced by: frege24 43248 frege16 43249 frege13 43255 frege15 43259 frege35 43271 frege49 43286 frege60a 43311 frege60b 43338 frege60c 43356 frege85 43381 frege127 43423 |
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