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Mirrors > Home > MPE Home > Th. List > imbi1 | Structured version Visualization version GIF version |
Description: Theorem *4.84 of [WhiteheadRussell] p. 122. (Contributed by NM, 3-Jan-2005.) |
Ref | Expression |
---|---|
imbi1 | ⊢ ((𝜑 ↔ 𝜓) → ((𝜑 → 𝜒) ↔ (𝜓 → 𝜒))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | id 22 | . 2 ⊢ ((𝜑 ↔ 𝜓) → (𝜑 ↔ 𝜓)) | |
2 | 1 | imbi1d 342 | 1 ⊢ ((𝜑 ↔ 𝜓) → ((𝜑 → 𝜒) ↔ (𝜓 → 𝜒))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 |
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 206 |
This theorem is referenced by: imbi1i 350 nanbi1 1496 ifpbi1 41063 3impexpVD 42446 ancomstVD 42455 onfrALTVD 42481 hbimpgVD 42494 hbexgVD 42496 ax6e2ndeqVD 42499 ax6e2ndeqALT 42521 |
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