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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 3498 |
. . 3
| |
| 2 | 1 | pm2.21i 651 |
. 2
|
| 3 | 2 | nrex 2624 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-ext 2213 |
| This theorem depends on definitions: df-bi 117 df-tru 1400 df-fal 1403 df-nf 1509 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ral 2515 df-rex 2516 df-v 2804 df-dif 3202 df-nul 3495 |
| This theorem is referenced by: 0iun 4028 finexdc 7091 0ct 7305 exfzdc 10485 |
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