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Related theorems GIF version |
| Description: Deduction from equality to equivalence of equalities. |
| Ref | Expression |
|---|---|
| eqeq1d.1 | ⊢ (φ → A = B) |
| Ref | Expression |
|---|---|
| eqeq1d | ⊢ (φ → (A = C ↔ B = C)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqeq1d.1 | . 2 ⊢ (φ → A = B) | |
| 2 | eqeq1 1484 | . 2 ⊢ (A = B → (A = C ↔ B = C)) | |
| 3 | 1, 2 | syl 10 | 1 ⊢ (φ → (A = C ↔ B = C)) |