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Mirrors > Home > MPE Home > Th. List > dmeqd | Structured version Visualization version GIF version |
Description: Equality deduction for domain. (Contributed by NM, 4-Mar-2004.) |
Ref | Expression |
---|---|
dmeqd.1 | ⊢ (𝜑 → 𝐴 = 𝐵) |
Ref | Expression |
---|---|
dmeqd | ⊢ (𝜑 → dom 𝐴 = dom 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dmeqd.1 | . 2 ⊢ (𝜑 → 𝐴 = 𝐵) | |
2 | dmeq 5815 | . 2 ⊢ (𝐴 = 𝐵 → dom 𝐴 = dom 𝐵) | |
3 | 1, 2 | syl 17 | 1 ⊢ (𝜑 → dom 𝐴 = dom 𝐵) |
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