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| Mirrors > Home > ILE Home > Th. List > eleqtrrdi | GIF version | ||
| Description: A membership and equality inference. (Contributed by NM, 24-Apr-2005.) | 
| Ref | Expression | 
|---|---|
| eleqtrrdi.1 | ⊢ (𝜑 → 𝐴 ∈ 𝐵) | 
| eleqtrrdi.2 | ⊢ 𝐶 = 𝐵 | 
| Ref | Expression | 
|---|---|
| eleqtrrdi | ⊢ (𝜑 → 𝐴 ∈ 𝐶) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | eleqtrrdi.1 | . 2 ⊢ (𝜑 → 𝐴 ∈ 𝐵) | |
| 2 | eleqtrrdi.2 | . . 3 ⊢ 𝐶 = 𝐵 | |
| 3 | 2 | eqcomi 2200 | . 2 ⊢ 𝐵 = 𝐶 | 
| 4 | 1, 3 | eleqtrdi 2289 | 1 ⊢ (𝜑 → 𝐴 ∈ 𝐶) | 
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