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Mirrors > Home > ILE Home > Th. List > 1on | Unicode version |
Description: Ordinal 1 is an ordinal number. (Contributed by NM, 29-Oct-1995.) |
Ref | Expression |
---|---|
1on |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-1o 6375 | . 2 | |
2 | 0elon 4364 | . . 3 | |
3 | 2 | onsuci 4487 | . 2 |
4 | 1, 3 | eqeltri 2237 | 1 |
Colors of variables: wff set class |
Syntax hints: wcel 2135 c0 3404 con0 4335 csuc 4337 c1o 6368 |
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 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-13 2137 ax-14 2138 ax-ext 2146 ax-sep 4094 ax-nul 4102 ax-pow 4147 ax-pr 4181 ax-un 4405 |
This theorem depends on definitions: df-bi 116 df-tru 1345 df-nf 1448 df-sb 1750 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-ral 2447 df-rex 2448 df-v 2723 df-dif 3113 df-un 3115 df-in 3117 df-ss 3124 df-nul 3405 df-pw 3555 df-sn 3576 df-pr 3577 df-uni 3784 df-tr 4075 df-iord 4338 df-on 4340 df-suc 4343 df-1o 6375 |
This theorem is referenced by: 1oex 6383 2on 6384 2on0 6385 2oconcl 6398 fnoei 6411 oeiexg 6412 oeiv 6415 oei0 6418 oeicl 6421 o1p1e2 6427 oawordriexmid 6429 enpr2d 6774 endisj 6781 snexxph 6906 djuex 6999 1stinr 7032 2ndinr 7033 pm54.43 7137 xpdjuen 7165 prarloclemarch2 7351 bj-el2oss1o 13490 nnsf 13719 |
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