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Mirrors > Home > MPE Home > Th. List > nanim | Structured version Visualization version GIF version |
Description: Show equivalence between implication and the Nicod version. To derive nic-dfim 1585, apply nanbi 1446. (Contributed by Jeff Hoffman, 19-Nov-2007.) |
Ref | Expression |
---|---|
nanim | ⊢ ((𝜑 → 𝜓) ↔ (𝜑 ⊼ (𝜓 ⊼ 𝜓))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nannan 1443 | . 2 ⊢ ((𝜑 ⊼ (𝜓 ⊼ 𝜓)) ↔ (𝜑 → (𝜓 ∧ 𝜓))) | |
2 | anidmdbi 676 | . 2 ⊢ ((𝜑 → (𝜓 ∧ 𝜓)) ↔ (𝜑 → 𝜓)) | |
3 | 1, 2 | bitr2i 264 | 1 ⊢ ((𝜑 → 𝜓) ↔ (𝜑 ⊼ (𝜓 ⊼ 𝜓))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 195 ∧ wa 383 ⊼ wnan 1439 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem depends on definitions: df-bi 196 df-an 385 df-nan 1440 |
This theorem is referenced by: nic-dfim 1585 nic-ax 1589 waj-ax 31583 lukshef-ax2 31584 |
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