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| Mirrors > Home > ILE Home > Th. List > abnex | Unicode version | ||
| Description: Sufficient condition for a class abstraction to be a proper class. Lemma for snnex 4545 and pwnex 4546. See the comment of abnexg 4543. (Contributed by BJ, 2-May-2021.) |
| Ref | Expression |
|---|---|
| abnex |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | vprc 4221 |
. 2
| |
| 2 | alral 2577 |
. . 3
| |
| 3 | rexv 2821 |
. . . . . . 7
| |
| 4 | 3 | bicomi 132 |
. . . . . 6
|
| 5 | 4 | abbii 2347 |
. . . . 5
|
| 6 | 5 | eleq1i 2297 |
. . . 4
|
| 7 | 6 | biimpi 120 |
. . 3
|
| 8 | abnexg 4543 |
. . 3
| |
| 9 | 2, 7, 8 | syl2im 38 |
. 2
|
| 10 | 1, 9 | mtoi 670 |
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-13 2204 ax-14 2205 ax-ext 2213 ax-sep 4207 ax-un 4530 |
| 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-in 3206 df-ss 3213 df-sn 3675 df-uni 3894 df-iun 3972 |
| This theorem is referenced by: pwnex 4546 |
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