| Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > ILE Home > Th. List > abnex | Unicode version | ||
| Description: Sufficient condition for a class abstraction to be a proper class. Lemma for snnex 4495 and pwnex 4496. See the comment of abnexg 4493. (Contributed by BJ, 2-May-2021.) |
| Ref | Expression |
|---|---|
| abnex |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | vprc 4176 |
. 2
| |
| 2 | alral 2551 |
. . 3
| |
| 3 | rexv 2790 |
. . . . . . 7
| |
| 4 | 3 | bicomi 132 |
. . . . . 6
|
| 5 | 4 | abbii 2321 |
. . . . 5
|
| 6 | 5 | eleq1i 2271 |
. . . 4
|
| 7 | 6 | biimpi 120 |
. . 3
|
| 8 | abnexg 4493 |
. . 3
| |
| 9 | 2, 7, 8 | syl2im 38 |
. 2
|
| 10 | 1, 9 | mtoi 666 |
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 615 ax-in2 616 ax-io 711 ax-5 1470 ax-7 1471 ax-gen 1472 ax-ie1 1516 ax-ie2 1517 ax-8 1527 ax-10 1528 ax-11 1529 ax-i12 1530 ax-bndl 1532 ax-4 1533 ax-17 1549 ax-i9 1553 ax-ial 1557 ax-i5r 1558 ax-13 2178 ax-14 2179 ax-ext 2187 ax-sep 4162 ax-un 4480 |
| This theorem depends on definitions: df-bi 117 df-tru 1376 df-fal 1379 df-nf 1484 df-sb 1786 df-clab 2192 df-cleq 2198 df-clel 2201 df-nfc 2337 df-ral 2489 df-rex 2490 df-v 2774 df-in 3172 df-ss 3179 df-sn 3639 df-uni 3851 df-iun 3929 |
| This theorem is referenced by: pwnex 4496 |
| Copyright terms: Public domain | W3C validator |