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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 4574 and pwnex 4575. See the comment of abnexg 4572. (Contributed by BJ, 2-May-2021.) |
| Ref | Expression |
|---|---|
| abnex |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | vprc 4247 |
. 2
| |
| 2 | alral 2589 |
. . 3
| |
| 3 | rexv 2834 |
. . . . . . 7
| |
| 4 | 3 | bicomi 132 |
. . . . . 6
|
| 5 | 4 | abbii 2350 |
. . . . 5
|
| 6 | 5 | eleq1i 2300 |
. . . 4
|
| 7 | 6 | biimpi 120 |
. . 3
|
| 8 | abnexg 4572 |
. . 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 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-13 2207 ax-14 2208 ax-ext 2216 ax-sep 4233 ax-un 4559 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ral 2527 df-rex 2528 df-v 2817 df-in 3220 df-ss 3227 df-sn 3700 df-uni 3920 df-iun 3998 |
| This theorem is referenced by: pwnex 4575 |
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