Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > ILE Home > Th. List > sylbid | GIF version |
Description: A syllogism deduction. (Contributed by NM, 3-Aug-1994.) |
Ref | Expression |
---|---|
sylbid.1 | ⊢ (𝜑 → (𝜓 ↔ 𝜒)) |
sylbid.2 | ⊢ (𝜑 → (𝜒 → 𝜃)) |
Ref | Expression |
---|---|
sylbid | ⊢ (𝜑 → (𝜓 → 𝜃)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sylbid.1 | . . 3 ⊢ (𝜑 → (𝜓 ↔ 𝜒)) | |
2 | 1 | biimpd 143 | . 2 ⊢ (𝜑 → (𝜓 → 𝜒)) |
3 | sylbid.2 | . 2 ⊢ (𝜑 → (𝜒 → 𝜃)) | |
4 | 2, 3 | syld 45 | 1 ⊢ (𝜑 → (𝜓 → 𝜃)) |
Copyright terms: Public domain | W3C validator |