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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 4333 |
. . . 4
| |
| 2 | disjsn 3728 |
. . . 4
| |
| 3 | 1, 2 | mpbir 146 |
. . 3
|
| 4 | disjdif2 3570 |
. . 3
| |
| 5 | 3, 4 | ax-mp 5 |
. 2
|
| 6 | 5 | eqcomi 2233 |
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 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-ext 2211 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-ral 2513 df-rab 2517 df-v 2801 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-nul 3492 df-sn 3672 df-pr 3673 df-op 3675 |
| This theorem is referenced by: fundm2domnop0 11062 |
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