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Mirrors > Home > MPE Home > Th. List > bimsc1 | Structured version Visualization version GIF version |
Description: Removal of conjunct from one side of an equivalence. (Contributed by NM, 21-Jun-1993.) |
Ref | Expression |
---|---|
bimsc1 | ⊢ (((𝜑 → 𝜓) ∧ (𝜒 ↔ (𝜓 ∧ 𝜑))) → (𝜒 ↔ 𝜑)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpr 476 | . . . 4 ⊢ ((𝜓 ∧ 𝜑) → 𝜑) | |
2 | ancr 570 | . . . 4 ⊢ ((𝜑 → 𝜓) → (𝜑 → (𝜓 ∧ 𝜑))) | |
3 | 1, 2 | impbid2 215 | . . 3 ⊢ ((𝜑 → 𝜓) → ((𝜓 ∧ 𝜑) ↔ 𝜑)) |
4 | 3 | bibi2d 331 | . 2 ⊢ ((𝜑 → 𝜓) → ((𝜒 ↔ (𝜓 ∧ 𝜑)) ↔ (𝜒 ↔ 𝜑))) |
5 | 4 | biimpa 500 | 1 ⊢ (((𝜑 → 𝜓) ∧ (𝜒 ↔ (𝜓 ∧ 𝜑))) → (𝜒 ↔ 𝜑)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 195 ∧ wa 383 |
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 |
This theorem is referenced by: bm1.3ii 4712 |
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