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| Mirrors > Home > MPE Home > Th. List > 4syl | Structured version Visualization version GIF version | ||
| Description: Inference chaining three syllogisms syl 17. (Contributed by BJ, 14-Jul-2018.) The use of this theorem is marked "discouraged" because it can cause the Metamath program "MM-PA> MINIMIZE_WITH *" command to have very long run times. However, feel free to use "MM-PA> MINIMIZE_WITH 4syl / OVERRIDE" if you wish. Remember to update the "discouraged" file if it gets used. (New usage is discouraged.) |
| Ref | Expression |
|---|---|
| 4syl.1 | ⊢ (𝜑 → 𝜓) |
| 4syl.2 | ⊢ (𝜓 → 𝜒) |
| 4syl.3 | ⊢ (𝜒 → 𝜃) |
| 4syl.4 | ⊢ (𝜃 → 𝜏) |
| Ref | Expression |
|---|---|
| 4syl | ⊢ (𝜑 → 𝜏) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 4syl.1 | . . 3 ⊢ (𝜑 → 𝜓) | |
| 2 | 4syl.2 | . . 3 ⊢ (𝜓 → 𝜒) | |
| 3 | 4syl.3 | . . 3 ⊢ (𝜒 → 𝜃) | |
| 4 | 1, 2, 3 | 3syl 18 | . 2 ⊢ (𝜑 → 𝜃) |
| 5 | 4syl.4 | . 2 ⊢ (𝜃 → 𝜏) | |
| 6 | 4, 5 | syl 17 | 1 ⊢ (𝜑 → 𝜏) |
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