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Mirrors > Home > MPE Home > Th. List > eqrdv | Structured version Visualization version GIF version |
Description: Deduce equality of classes from equivalence of membership. (Contributed by NM, 17-Mar-1996.) |
Ref | Expression |
---|---|
eqrdv.1 | ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵)) |
Ref | Expression |
---|---|
eqrdv | ⊢ (𝜑 → 𝐴 = 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqrdv.1 | . . 3 ⊢ (𝜑 → (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵)) | |
2 | 1 | alrimiv 1931 | . 2 ⊢ (𝜑 → ∀𝑥(𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵)) |
3 | dfcleq 2731 | . 2 ⊢ (𝐴 = 𝐵 ↔ ∀𝑥(𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵)) | |
4 | 2, 3 | sylibr 233 | 1 ⊢ (𝜑 → 𝐴 = 𝐵) |
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