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Mirrors > Home > MPE Home > Th. List > cbvsumv | Structured version Visualization version GIF version |
Description: Change bound variable in a sum. (Contributed by NM, 11-Dec-2005.) (Revised by Mario Carneiro, 13-Jul-2013.) |
Ref | Expression |
---|---|
cbvsum.1 | ⊢ (𝑗 = 𝑘 → 𝐵 = 𝐶) |
Ref | Expression |
---|---|
cbvsumv | ⊢ Σ𝑗 ∈ 𝐴 𝐵 = Σ𝑘 ∈ 𝐴 𝐶 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cbvsum.1 | . 2 ⊢ (𝑗 = 𝑘 → 𝐵 = 𝐶) | |
2 | nfcv 2906 | . 2 ⊢ Ⅎ𝑘𝐴 | |
3 | nfcv 2906 | . 2 ⊢ Ⅎ𝑗𝐴 | |
4 | nfcv 2906 | . 2 ⊢ Ⅎ𝑘𝐵 | |
5 | nfcv 2906 | . 2 ⊢ Ⅎ𝑗𝐶 | |
6 | 1, 2, 3, 4, 5 | cbvsum 15335 | 1 ⊢ Σ𝑗 ∈ 𝐴 𝐵 = Σ𝑘 ∈ 𝐴 𝐶 |
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