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Mirrors > Home > ILE Home > Th. List > eqcomd | GIF version |
Description: Deduction from commutative law for class equality. (Contributed by NM, 15-Aug-1994.) |
Ref | Expression |
---|---|
eqcomd.1 | ⊢ (𝜑 → 𝐴 = 𝐵) |
Ref | Expression |
---|---|
eqcomd | ⊢ (𝜑 → 𝐵 = 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqcomd.1 | . 2 ⊢ (𝜑 → 𝐴 = 𝐵) | |
2 | eqcom 2172 | . 2 ⊢ (𝐴 = 𝐵 ↔ 𝐵 = 𝐴) | |
3 | 1, 2 | sylib 121 | 1 ⊢ (𝜑 → 𝐵 = 𝐴) |
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