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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 8085 | . 2 ⊢ 1o = suc ∅ | |
2 | peano1 7581 | . . 3 ⊢ ∅ ∈ ω | |
3 | peano2 7582 | . . 3 ⊢ (∅ ∈ ω → suc ∅ ∈ ω) | |
4 | 2, 3 | ax-mp 5 | . 2 ⊢ suc ∅ ∈ ω |
5 | 1, 4 | eqeltri 2886 | 1 ⊢ 1o ∈ ω |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2111 ∅c0 4243 suc csuc 6161 ωcom 7560 1oc1o 8078 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pr 5295 ax-un 7441 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3or 1085 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ne 2988 df-ral 3111 df-rex 3112 df-rab 3115 df-v 3443 df-sbc 3721 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-pss 3900 df-nul 4244 df-if 4426 df-pw 4499 df-sn 4526 df-pr 4528 df-tp 4530 df-op 4532 df-uni 4801 df-br 5031 df-opab 5093 df-tr 5137 df-eprel 5430 df-po 5438 df-so 5439 df-fr 5478 df-we 5480 df-ord 6162 df-on 6163 df-lim 6164 df-suc 6165 df-om 7561 df-1o 8085 |
This theorem is referenced by: 2onn 8249 1one2o 8252 oaabs2 8255 omabs 8257 nnm2 8259 nnneo 8261 nneob 8262 snfi 8577 snnen2o 8691 1sdom2 8701 1sdom 8705 unxpdom2 8710 en1eqsn 8732 en2 8738 pwfi 8803 wofib 8993 oancom 9098 cnfcom3clem 9152 djurf1o 9326 card1 9381 pm54.43lem 9413 en2eleq 9419 en2other2 9420 infxpenlem 9424 infxpenc2lem1 9430 sdom2en01 9713 cfpwsdom 9995 canthp1lem2 10064 gchdju1 10067 pwxpndom2 10076 pwdjundom 10078 1pi 10294 1lt2pi 10316 indpi 10318 hash2 13762 hash1snb 13776 fnpr2o 16822 fvpr1o 16825 f1otrspeq 18567 pmtrf 18575 pmtrmvd 18576 pmtrfinv 18581 lt6abl 19008 isnzr2 20029 frgpcyg 20265 vr1cl 20846 ply1coe 20925 isppw 25699 bnj906 32312 sat1el2xp 32739 satfv1fvfmla1 32783 satefvfmla1 32785 ex-sategoelelomsuc 32786 ex-sategoelel12 32787 finxpreclem1 34806 finxpreclem2 34807 finxp1o 34809 finxpreclem4 34811 finxp2o 34816 domalom 34821 |
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