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Mirrors > Home > ILE Home > Th. List > 1on | GIF version |
Description: Ordinal 1 is an ordinal number. (Contributed by NM, 29-Oct-1995.) |
Ref | Expression |
---|---|
1on | ⊢ 1o ∈ On |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-1o 6321 | . 2 ⊢ 1o = suc ∅ | |
2 | 0elon 4322 | . . 3 ⊢ ∅ ∈ On | |
3 | 2 | onsuci 4440 | . 2 ⊢ suc ∅ ∈ On |
4 | 1, 3 | eqeltri 2213 | 1 ⊢ 1o ∈ On |
Colors of variables: wff set class |
Syntax hints: ∈ wcel 1481 ∅c0 3368 Oncon0 4293 suc csuc 4295 1oc1o 6314 |
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-13 1492 ax-14 1493 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-sep 4054 ax-nul 4062 ax-pow 4106 ax-pr 4139 ax-un 4363 |
This theorem depends on definitions: df-bi 116 df-tru 1335 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-ral 2422 df-rex 2423 df-v 2691 df-dif 3078 df-un 3080 df-in 3082 df-ss 3089 df-nul 3369 df-pw 3517 df-sn 3538 df-pr 3539 df-uni 3745 df-tr 4035 df-iord 4296 df-on 4298 df-suc 4301 df-1o 6321 |
This theorem is referenced by: 1oex 6329 2on 6330 2on0 6331 2oconcl 6344 fnoei 6356 oeiexg 6357 oeiv 6360 oei0 6363 oeicl 6366 o1p1e2 6372 oawordriexmid 6374 enpr2d 6719 endisj 6726 snexxph 6846 djuex 6936 1stinr 6969 2ndinr 6970 pm54.43 7063 xpdjuen 7091 prarloclemarch2 7251 bj-el2oss1o 13152 nnsf 13374 |
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