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Mirrors > Home > MPE Home > Th. List > anabs7 | Structured version Visualization version GIF version |
Description: Absorption into embedded conjunct. (Contributed by NM, 20-Jul-1996.) (Proof shortened by Wolf Lammen, 17-Nov-2013.) |
Ref | Expression |
---|---|
anabs7 | ⊢ ((𝜓 ∧ (𝜑 ∧ 𝜓)) ↔ (𝜑 ∧ 𝜓)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpr 485 | . . 3 ⊢ ((𝜑 ∧ 𝜓) → 𝜓) | |
2 | 1 | pm4.71ri 561 | . 2 ⊢ ((𝜑 ∧ 𝜓) ↔ (𝜓 ∧ (𝜑 ∧ 𝜓))) |
3 | 2 | bicomi 223 | 1 ⊢ ((𝜓 ∧ (𝜑 ∧ 𝜓)) ↔ (𝜑 ∧ 𝜓)) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 205 ∧ wa 396 |
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 df-an 397 |
This theorem is referenced by: prtlem15 36897 un2122 42391 |
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