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| Mirrors > Home > MPE Home > Th. List > biantrud | Structured version Visualization version GIF version | ||
| Description: A wff is equivalent to its conjunction with truth. (Contributed by NM, 2-Aug-1994.) (Proof shortened by Wolf Lammen, 23-Oct-2013.) |
| Ref | Expression |
|---|---|
| biantrud.1 | ⊢ (𝜑 → 𝜓) |
| Ref | Expression |
|---|---|
| biantrud | ⊢ (𝜑 → (𝜒 ↔ (𝜒 ∧ 𝜓))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | biantrud.1 | . 2 ⊢ (𝜑 → 𝜓) | |
| 2 | iba 527 | . 2 ⊢ (𝜓 → (𝜒 ↔ (𝜒 ∧ 𝜓))) | |
| 3 | 1, 2 | syl 17 | 1 ⊢ (𝜑 → (𝜒 ↔ (𝜒 ∧ 𝜓))) |
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