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| Mirrors > Home > NFE Home > Th. List > eqeq2d | GIF version | ||
| Description: Deduction from equality to equivalence of equalities. (Contributed by NM, 27-Dec-1993.) |
| Ref | Expression |
|---|---|
| eqeq2d.1 | ⊢ (φ → A = B) |
| Ref | Expression |
|---|---|
| eqeq2d | ⊢ (φ → (C = A ↔ C = B)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqeq2d.1 | . 2 ⊢ (φ → A = B) | |
| 2 | eqeq2 2362 | . 2 ⊢ (A = B → (C = A ↔ C = B)) | |
| 3 | 1, 2 | syl 15 | 1 ⊢ (φ → (C = A ↔ C = B)) |
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