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Mirrors > Home > ILE Home > Th. List > nfco | GIF version |
Description: Bound-variable hypothesis builder for function value. (Contributed by NM, 1-Sep-1999.) |
Ref | Expression |
---|---|
nfco.1 | ⊢ Ⅎ𝑥𝐴 |
nfco.2 | ⊢ Ⅎ𝑥𝐵 |
Ref | Expression |
---|---|
nfco | ⊢ Ⅎ𝑥(𝐴 ∘ 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-co 4607 | . 2 ⊢ (𝐴 ∘ 𝐵) = {〈𝑦, 𝑧〉 ∣ ∃𝑤(𝑦𝐵𝑤 ∧ 𝑤𝐴𝑧)} | |
2 | nfcv 2306 | . . . . . 6 ⊢ Ⅎ𝑥𝑦 | |
3 | nfco.2 | . . . . . 6 ⊢ Ⅎ𝑥𝐵 | |
4 | nfcv 2306 | . . . . . 6 ⊢ Ⅎ𝑥𝑤 | |
5 | 2, 3, 4 | nfbr 4022 | . . . . 5 ⊢ Ⅎ𝑥 𝑦𝐵𝑤 |
6 | nfco.1 | . . . . . 6 ⊢ Ⅎ𝑥𝐴 | |
7 | nfcv 2306 | . . . . . 6 ⊢ Ⅎ𝑥𝑧 | |
8 | 4, 6, 7 | nfbr 4022 | . . . . 5 ⊢ Ⅎ𝑥 𝑤𝐴𝑧 |
9 | 5, 8 | nfan 1552 | . . . 4 ⊢ Ⅎ𝑥(𝑦𝐵𝑤 ∧ 𝑤𝐴𝑧) |
10 | 9 | nfex 1624 | . . 3 ⊢ Ⅎ𝑥∃𝑤(𝑦𝐵𝑤 ∧ 𝑤𝐴𝑧) |
11 | 10 | nfopab 4044 | . 2 ⊢ Ⅎ𝑥{〈𝑦, 𝑧〉 ∣ ∃𝑤(𝑦𝐵𝑤 ∧ 𝑤𝐴𝑧)} |
12 | 1, 11 | nfcxfr 2303 | 1 ⊢ Ⅎ𝑥(𝐴 ∘ 𝐵) |
Colors of variables: wff set class |
Syntax hints: ∧ wa 103 ∃wex 1479 Ⅎwnfc 2293 class class class wbr 3976 {copab 4036 ∘ ccom 4602 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 699 ax-5 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-ext 2146 |
This theorem depends on definitions: df-bi 116 df-3an 969 df-tru 1345 df-nf 1448 df-sb 1750 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-v 2723 df-un 3115 df-sn 3576 df-pr 3577 df-op 3579 df-br 3977 df-opab 4038 df-co 4607 |
This theorem is referenced by: nffun 5205 nftpos 6238 cnmpt11 12824 cnmpt21 12832 |
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