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| Mirrors > Home > MPE Home > Th. List > mptru | Structured version Visualization version GIF version | ||
| Description: Eliminate ⊤ as an antecedent. A proposition implied by ⊤ is true. This is modus ponens ax-mp 5 when the minor hypothesis is ⊤ (which holds by tru 1543). (Contributed by Mario Carneiro, 13-Mar-2014.) |
| Ref | Expression |
|---|---|
| mptru.1 | ⊢ (⊤ → 𝜑) |
| Ref | Expression |
|---|---|
| mptru | ⊢ 𝜑 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | tru 1543 | . 2 ⊢ ⊤ | |
| 2 | mptru.1 | . 2 ⊢ (⊤ → 𝜑) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ 𝜑 |
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