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Mirrors > Home > ILE Home > Th. List > nfald | Unicode version |
Description: If is not free in , it is not free in . (Contributed by Mario Carneiro, 24-Sep-2016.) (Proof shortened by Wolf Lammen, 6-Jan-2018.) |
Ref | Expression |
---|---|
nfald.1 | |
nfald.2 |
Ref | Expression |
---|---|
nfald |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfald.1 | . . . 4 | |
2 | 1 | nfri 1452 | . . 3 |
3 | nfald.2 | . . 3 | |
4 | 2, 3 | alrimih 1398 | . 2 |
5 | nfnf1 1476 | . . . 4 | |
6 | 5 | nfal 1508 | . . 3 |
7 | hba1 1473 | . . . 4 | |
8 | sp 1441 | . . . . 5 | |
9 | 8 | nfrd 1453 | . . . 4 |
10 | 7, 9 | hbald 1420 | . . 3 |
11 | 6, 10 | nfd 1456 | . 2 |
12 | 4, 11 | syl 14 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wal 1282 wnf 1389 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-5 1376 ax-7 1377 ax-gen 1378 ax-4 1440 ax-ial 1467 |
This theorem depends on definitions: df-bi 115 df-nf 1390 |
This theorem is referenced by: dvelimALT 1927 dvelimfv 1928 nfeudv 1956 nfeqd 2233 nfraldxy 2398 nfiotadxy 4890 bdsepnft 10678 strcollnft 10779 |
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