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Mirrors > Home > MPE Home > Th. List > uneq2i | Structured version Visualization version GIF version |
Description: Inference adding union to the left in a class equality. (Contributed by NM, 30-Aug-1993.) |
Ref | Expression |
---|---|
uneq1i.1 | ⊢ 𝐴 = 𝐵 |
Ref | Expression |
---|---|
uneq2i | ⊢ (𝐶 ∪ 𝐴) = (𝐶 ∪ 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | uneq1i.1 | . 2 ⊢ 𝐴 = 𝐵 | |
2 | uneq2 4095 | . 2 ⊢ (𝐴 = 𝐵 → (𝐶 ∪ 𝐴) = (𝐶 ∪ 𝐵)) | |
3 | 1, 2 | ax-mp 5 | 1 ⊢ (𝐶 ∪ 𝐴) = (𝐶 ∪ 𝐵) |
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