Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > ILE Home > Th. List > nfrexdxy | Unicode version |
Description: Not-free for restricted existential quantification where and are distinct. See nfrexdya 2401 for a version with and distinct instead. (Contributed by Jim Kingdon, 30-May-2018.) |
Ref | Expression |
---|---|
nfraldxy.2 | |
nfraldxy.3 | |
nfraldxy.4 |
Ref | Expression |
---|---|
nfrexdxy |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-rex 2354 | . 2 | |
2 | nfraldxy.2 | . . 3 | |
3 | nfcv 2219 | . . . . . 6 | |
4 | 3 | a1i 9 | . . . . 5 |
5 | nfraldxy.3 | . . . . 5 | |
6 | 4, 5 | nfeld 2234 | . . . 4 |
7 | nfraldxy.4 | . . . 4 | |
8 | 6, 7 | nfand 1500 | . . 3 |
9 | 2, 8 | nfexd 1684 | . 2 |
10 | 1, 9 | nfxfrd 1404 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 102 wnf 1389 wex 1421 wcel 1433 wnfc 2206 wrex 2349 |
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-ie1 1422 ax-ie2 1423 ax-4 1440 ax-17 1459 ax-ial 1467 ax-i5r 1468 ax-ext 2063 |
This theorem depends on definitions: df-bi 115 df-nf 1390 df-cleq 2074 df-clel 2077 df-nfc 2208 df-rex 2354 |
This theorem is referenced by: nfrexdya 2401 nfrexxy 2403 nfunid 3608 strcollnft 10779 |
Copyright terms: Public domain | W3C validator |