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Mirrors > Home > ILE Home > Th. List > nfand | Unicode version |
Description: If in a context is not free in and , it is not free in . (Contributed by Mario Carneiro, 7-Oct-2016.) |
Ref | Expression |
---|---|
nfand.1 | |
nfand.2 |
Ref | Expression |
---|---|
nfand |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfand.1 | . . . 4 | |
2 | nfand.2 | . . . 4 | |
3 | 1, 2 | jca 300 | . . 3 |
4 | df-nf 1390 | . . . . . 6 | |
5 | df-nf 1390 | . . . . . 6 | |
6 | 4, 5 | anbi12i 447 | . . . . 5 |
7 | 19.26 1410 | . . . . 5 | |
8 | 6, 7 | bitr4i 185 | . . . 4 |
9 | prth 336 | . . . . . 6 | |
10 | 19.26 1410 | . . . . . 6 | |
11 | 9, 10 | syl6ibr 160 | . . . . 5 |
12 | 11 | alimi 1384 | . . . 4 |
13 | 8, 12 | sylbi 119 | . . 3 |
14 | 3, 13 | syl 14 | . 2 |
15 | df-nf 1390 | . 2 | |
16 | 14, 15 | sylibr 132 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 102 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-gen 1378 |
This theorem depends on definitions: df-bi 115 df-nf 1390 |
This theorem is referenced by: nf3and 1501 nfbid 1520 nfsbxy 1859 nfsbxyt 1860 nfeld 2234 nfrexdxy 2399 nfreudxy 2527 nfifd 3376 nfriotadxy 5496 bdsepnft 10678 |
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