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Mirrors > Home > ILE Home > Th. List > rex0 | Unicode version |
Description: Vacuous existential quantification is false. (Contributed by NM, 15-Oct-2003.) |
Ref | Expression |
---|---|
rex0 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | noel 3413 | . . 3 | |
2 | 1 | pm2.21i 636 | . 2 |
3 | 2 | nrex 2558 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wcel 2136 wrex 2445 c0 3409 |
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-in1 604 ax-in2 605 ax-io 699 ax-5 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-10 1493 ax-11 1494 ax-i12 1495 ax-bndl 1497 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-ext 2147 |
This theorem depends on definitions: df-bi 116 df-tru 1346 df-fal 1349 df-nf 1449 df-sb 1751 df-clab 2152 df-cleq 2158 df-clel 2161 df-nfc 2297 df-ral 2449 df-rex 2450 df-v 2728 df-dif 3118 df-nul 3410 |
This theorem is referenced by: 0iun 3923 finexdc 6868 0ct 7072 exfzdc 10175 |
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