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Related theorems GIF version |
| Description: An equality transitivity deduction. |
| Ref | Expression |
|---|---|
| eqtrd.1 | ⊢ (φ → A = B) |
| eqtrd.2 | ⊢ (φ → B = C) |
| Ref | Expression |
|---|---|
| eqtrd | ⊢ (φ → A = C) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqtrd.1 | . 2 ⊢ (φ → A = B) | |
| 2 | eqtrd.2 | . . 3 ⊢ (φ → B = C) | |
| 3 | 2 | eqeq2d 1489 | . 2 ⊢ (φ → (A = B ↔ A = C)) |
| 4 | 1, 3 | mpbid 195 | 1 ⊢ (φ → A = C) |