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Related theorems GIF version |
| Description: Equality theorem for operations. |
| Ref | Expression |
|---|---|
| opreq1 | ⊢ (A = B → (AFC) = (BFC)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | opeq1 1876 | . . 3 ⊢ (A = B → 〈A, C〉 = 〈B, C〉) | |
| 2 | 1 | fveq2d 2836 | . 2 ⊢ (A = B → (F ‘〈A, C〉) = (F ‘〈B, C〉)) |
| 3 | df-opr 3003 | . 2 ⊢ (AFC) = (F ‘〈A, C〉) | |
| 4 | df-opr 3003 | . 2 ⊢ (BFC) = (F ‘〈B, C〉) | |
| 5 | 2, 3, 4 | 3eqtr4g 1147 | 1 ⊢ (A = B → (AFC) = (BFC)) |