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Mirrors > Home > ILE Home > Th. List > eleq2i | GIF version |
Description: Inference from equality to equivalence of membership. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
eleq1i.1 | ⊢ 𝐴 = 𝐵 |
Ref | Expression |
---|---|
eleq2i | ⊢ (𝐶 ∈ 𝐴 ↔ 𝐶 ∈ 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eleq1i.1 | . 2 ⊢ 𝐴 = 𝐵 | |
2 | eleq2 2229 | . 2 ⊢ (𝐴 = 𝐵 → (𝐶 ∈ 𝐴 ↔ 𝐶 ∈ 𝐵)) | |
3 | 1, 2 | ax-mp 5 | 1 ⊢ (𝐶 ∈ 𝐴 ↔ 𝐶 ∈ 𝐵) |
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