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Mirrors > Home > ILE Home > Th. List > sucexb | Unicode version |
Description: A successor exists iff its class argument exists. (Contributed by NM, 22-Jun-1998.) |
Ref | Expression |
---|---|
sucexb |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | unexb 4195 | . 2 | |
2 | snexg 3956 | . . 3 | |
3 | 2 | pm4.71i 383 | . 2 |
4 | df-suc 4126 | . . 3 | |
5 | 4 | eleq1i 2144 | . 2 |
6 | 1, 3, 5 | 3bitr4i 210 | 1 |
Colors of variables: wff set class |
Syntax hints: wa 102 wb 103 wcel 1433 cvv 2601 cun 2971 csn 3398 csuc 4120 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-13 1444 ax-14 1445 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 ax-sep 3896 ax-pow 3948 ax-pr 3964 ax-un 4188 |
This theorem depends on definitions: df-bi 115 df-tru 1287 df-nf 1390 df-sb 1686 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-rex 2354 df-v 2603 df-un 2977 df-in 2979 df-ss 2986 df-pw 3384 df-sn 3404 df-pr 3405 df-uni 3602 df-suc 4126 |
This theorem is referenced by: sucexg 4242 sucelon 4247 onsucelsucr 4252 sucunielr 4254 peano2b 4355 |
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