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Mirrors > Home > ILE Home > Th. List > eleq2s | GIF version |
Description: Substitution of equal classes into a membership antecedent. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) |
Ref | Expression |
---|---|
eleq2s.1 | ⊢ (𝐴 ∈ 𝐵 → 𝜑) |
eleq2s.2 | ⊢ 𝐶 = 𝐵 |
Ref | Expression |
---|---|
eleq2s | ⊢ (𝐴 ∈ 𝐶 → 𝜑) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eleq2s.2 | . . 3 ⊢ 𝐶 = 𝐵 | |
2 | 1 | eleq2i 2237 | . 2 ⊢ (𝐴 ∈ 𝐶 ↔ 𝐴 ∈ 𝐵) |
3 | eleq2s.1 | . 2 ⊢ (𝐴 ∈ 𝐵 → 𝜑) | |
4 | 2, 3 | sylbi 120 | 1 ⊢ (𝐴 ∈ 𝐶 → 𝜑) |
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