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Mirrors > Home > MPE Home > Th. List > oveq1 | Structured version Visualization version GIF version |
Description: Equality theorem for operation value. (Contributed by NM, 28-Feb-1995.) |
Ref | Expression |
---|---|
oveq1 | ⊢ (𝐴 = 𝐵 → (𝐴𝐹𝐶) = (𝐵𝐹𝐶)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | opeq1 4873 | . . 3 ⊢ (𝐴 = 𝐵 → ⟨𝐴, 𝐶⟩ = ⟨𝐵, 𝐶⟩) | |
2 | 1 | fveq2d 6893 | . 2 ⊢ (𝐴 = 𝐵 → (𝐹‘⟨𝐴, 𝐶⟩) = (𝐹‘⟨𝐵, 𝐶⟩)) |
3 | df-ov 7409 | . 2 ⊢ (𝐴𝐹𝐶) = (𝐹‘⟨𝐴, 𝐶⟩) | |
4 | df-ov 7409 | . 2 ⊢ (𝐵𝐹𝐶) = (𝐹‘⟨𝐵, 𝐶⟩) | |
5 | 2, 3, 4 | 3eqtr4g 2798 | 1 ⊢ (𝐴 = 𝐵 → (𝐴𝐹𝐶) = (𝐵𝐹𝐶)) |
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