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Mirrors > Home > ILE Home > Th. List > snon0 | Unicode version |
Description: An ordinal which is a singleton is . (Contributed by Jim Kingdon, 19-Oct-2021.) |
Ref | Expression |
---|---|
snon0 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elirr 4464 | . . 3 | |
2 | snidg 3561 | . . . . . . 7 | |
3 | 2 | adantr 274 | . . . . . 6 |
4 | ontr1 4319 | . . . . . . 7 | |
5 | 4 | adantl 275 | . . . . . 6 |
6 | 3, 5 | mpan2d 425 | . . . . 5 |
7 | elsni 3550 | . . . . 5 | |
8 | 6, 7 | syl6 33 | . . . 4 |
9 | eleq1 2203 | . . . . 5 | |
10 | 9 | biimpcd 158 | . . . 4 |
11 | 8, 10 | sylcom 28 | . . 3 |
12 | 1, 11 | mtoi 654 | . 2 |
13 | 12 | eq0rdv 3412 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 103 wceq 1332 wcel 1481 c0 3368 csn 3532 con0 4293 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-setind 4460 |
This theorem depends on definitions: df-bi 116 df-3an 965 df-tru 1335 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-ne 2310 df-ral 2422 df-rex 2423 df-v 2691 df-dif 3078 df-in 3082 df-ss 3089 df-nul 3369 df-sn 3538 df-uni 3745 df-tr 4035 df-iord 4296 df-on 4298 |
This theorem is referenced by: (None) |
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