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Mirrors > Home > MPE Home > Th. List > cbvrabv | Structured version Visualization version GIF version |
Description: Rule to change the bound variable in a restricted class abstraction, using implicit substitution. (Contributed by NM, 26-May-1999.) |
Ref | Expression |
---|---|
cbvrabv.1 | ⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜓)) |
Ref | Expression |
---|---|
cbvrabv | ⊢ {𝑥 ∈ 𝐴 ∣ 𝜑} = {𝑦 ∈ 𝐴 ∣ 𝜓} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfcv 2751 | . 2 ⊢ Ⅎ𝑥𝐴 | |
2 | nfcv 2751 | . 2 ⊢ Ⅎ𝑦𝐴 | |
3 | nfv 1830 | . 2 ⊢ Ⅎ𝑦𝜑 | |
4 | nfv 1830 | . 2 ⊢ Ⅎ𝑥𝜓 | |
5 | cbvrabv.1 | . 2 ⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜓)) | |
6 | 1, 2, 3, 4, 5 | cbvrab 3171 | 1 ⊢ {𝑥 ∈ 𝐴 ∣ 𝜑} = {𝑦 ∈ 𝐴 ∣ 𝜓} |
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