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| Mirrors > Home > ILE Home > Th. List > cbvsumi | GIF version | ||
| Description: Change bound variable in a sum. (Contributed by NM, 11-Dec-2005.) |
| Ref | Expression |
|---|---|
| cbvsumi.1 | ⊢ Ⅎ𝑘𝐵 |
| cbvsumi.2 | ⊢ Ⅎ𝑗𝐶 |
| cbvsumi.3 | ⊢ (𝑗 = 𝑘 → 𝐵 = 𝐶) |
| Ref | Expression |
|---|---|
| cbvsumi | ⊢ Σ𝑗 ∈ 𝐴 𝐵 = Σ𝑘 ∈ 𝐴 𝐶 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cbvsumi.3 | . 2 ⊢ (𝑗 = 𝑘 → 𝐵 = 𝐶) | |
| 2 | nfcv 2392 | . 2 ⊢ Ⅎ𝑘𝐴 | |
| 3 | nfcv 2392 | . 2 ⊢ Ⅎ𝑗𝐴 | |
| 4 | cbvsumi.1 | . 2 ⊢ Ⅎ𝑘𝐵 | |
| 5 | cbvsumi.2 | . 2 ⊢ Ⅎ𝑗𝐶 | |
| 6 | 1, 2, 3, 4, 5 | cbvsum 12128 | 1 ⊢ Σ𝑗 ∈ 𝐴 𝐵 = Σ𝑘 ∈ 𝐴 𝐶 |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 = wceq 1402 Ⅎwnfc 2379 Σcsu 12121 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-rex 2534 df-rab 2537 df-v 2823 df-sbc 3052 df-csb 3148 df-un 3224 df-in 3226 df-ss 3233 df-if 3639 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-br 4131 df-opab 4193 df-mpt 4194 df-cnv 4782 df-dm 4784 df-rn 4785 df-res 4786 df-iota 5337 df-fv 5385 df-ov 6088 df-oprab 6089 df-mpo 6090 df-recs 6576 df-frec 6662 df-seqfrec 10887 df-sumdc 12122 |
| This theorem is used by: sumfct 12142 isumss2 12162 fsumzcl2 12174 fsumsplitf 12177 sumsnf 12178 sumsns 12184 fsumsplitsnun 12188 fsum2dlemstep 12203 fisumcom2 12207 fsumshftm 12214 fsumiun 12246 elplyd 15844 fsumdvdsmul 16111 |
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