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| Mirrors > Home > ILE Home > Th. List > opwo0id | Unicode version | ||
| Description: An ordered pair is equal to the ordered pair without the empty set. This is because no ordered pair contains the empty set. (Contributed by AV, 15-Nov-2021.) |
| Ref | Expression |
|---|---|
| opwo0id |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0nelop 4346 |
. . . 4
| |
| 2 | disjsn 3735 |
. . . 4
| |
| 3 | 1, 2 | mpbir 146 |
. . 3
|
| 4 | disjdif2 3575 |
. . 3
| |
| 5 | 3, 4 | ax-mp 5 |
. 2
|
| 6 | 5 | eqcomi 2235 |
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 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-ext 2213 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-ne 2404 df-ral 2516 df-rab 2520 df-v 2805 df-dif 3203 df-un 3205 df-in 3207 df-ss 3214 df-nul 3497 df-sn 3679 df-pr 3680 df-op 3682 |
| This theorem is referenced by: fundm2domnop0 11158 |
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