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Mirrors > Home > ILE Home > Th. List > nfor | Unicode version |
Description: If is not free in and , it is not free in . (Contributed by Jim Kingdon, 11-Mar-2018.) |
Ref | Expression |
---|---|
nfor.1 | |
nfor.2 |
Ref | Expression |
---|---|
nfor |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfor.1 | . . . 4 | |
2 | 1 | nfri 1412 | . . 3 |
3 | nfor.2 | . . . 4 | |
4 | 3 | nfri 1412 | . . 3 |
5 | 2, 4 | hbor 1438 | . 2 |
6 | 5 | nfi 1351 | 1 |
Colors of variables: wff set class |
Syntax hints: wo 629 wnf 1349 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-io 630 ax-5 1336 ax-gen 1338 ax-4 1400 |
This theorem depends on definitions: df-bi 110 df-nf 1350 |
This theorem is referenced by: nfdc 1549 nfun 3099 nfpr 3420 nfso 4039 nffrec 5982 indpi 6440 nfsum1 9875 nfsum 9876 bj-findis 10104 |
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