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Mirrors > Home > MPE Home > Th. List > 1onn | Structured version Visualization version GIF version |
Description: One is a natural number. (Contributed by NM, 29-Oct-1995.) |
Ref | Expression |
---|---|
1onn | ⊢ 1o ∈ ω |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-1o 8096 | . 2 ⊢ 1o = suc ∅ | |
2 | peano1 7595 | . . 3 ⊢ ∅ ∈ ω | |
3 | peano2 7596 | . . 3 ⊢ (∅ ∈ ω → suc ∅ ∈ ω) | |
4 | 2, 3 | ax-mp 5 | . 2 ⊢ suc ∅ ∈ ω |
5 | 1, 4 | eqeltri 2909 | 1 ⊢ 1o ∈ ω |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2110 ∅c0 4290 suc csuc 6187 ωcom 7574 1oc1o 8089 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-sep 5195 ax-nul 5202 ax-pr 5321 ax-un 7455 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3496 df-sbc 3772 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-pss 3953 df-nul 4291 df-if 4467 df-pw 4540 df-sn 4561 df-pr 4563 df-tp 4565 df-op 4567 df-uni 4832 df-br 5059 df-opab 5121 df-tr 5165 df-eprel 5459 df-po 5468 df-so 5469 df-fr 5508 df-we 5510 df-ord 6188 df-on 6189 df-lim 6190 df-suc 6191 df-om 7575 df-1o 8096 |
This theorem is referenced by: 2onn 8260 1one2o 8263 oaabs2 8266 omabs 8268 nnm2 8270 nnneo 8272 nneob 8273 snfi 8588 snnen2o 8701 1sdom2 8711 1sdom 8715 unxpdom2 8720 en1eqsn 8742 en2 8748 pwfi 8813 wofib 9003 oancom 9108 cnfcom3clem 9162 djurf1o 9336 card1 9391 pm54.43lem 9422 en2eleq 9428 en2other2 9429 infxpenlem 9433 infxpenc2lem1 9439 sdom2en01 9718 cfpwsdom 10000 canthp1lem2 10069 gchdju1 10072 pwxpndom2 10081 pwdjundom 10083 1pi 10299 1lt2pi 10321 indpi 10323 hash2 13760 hash1snb 13774 fnpr2o 16824 fvpr1o 16827 f1otrspeq 18569 pmtrf 18577 pmtrmvd 18578 pmtrfinv 18583 lt6abl 19009 isnzr2 20030 vr1cl 20379 ply1coe 20458 frgpcyg 20714 isppw 25685 bnj906 32197 sat1el2xp 32621 satfv1fvfmla1 32665 satefvfmla1 32667 ex-sategoelelomsuc 32668 ex-sategoelel12 32669 finxpreclem1 34664 finxpreclem2 34665 finxp1o 34667 finxpreclem4 34669 finxp2o 34674 domalom 34679 |
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