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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 7447 | . 2 ⊢ 1𝑜 = suc ∅ | |
2 | peano1 6977 | . . 3 ⊢ ∅ ∈ ω | |
3 | peano2 6978 | . . 3 ⊢ (∅ ∈ ω → suc ∅ ∈ ω) | |
4 | 2, 3 | ax-mp 5 | . 2 ⊢ suc ∅ ∈ ω |
5 | 1, 4 | eqeltri 2684 | 1 ⊢ 1𝑜 ∈ ω |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 1977 ∅c0 3874 suc csuc 5642 ωcom 6957 1𝑜c1o 7440 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-sep 4709 ax-nul 4717 ax-pr 4833 ax-un 6847 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3or 1032 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-ral 2901 df-rex 2902 df-rab 2905 df-v 3175 df-sbc 3403 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-pss 3556 df-nul 3875 df-if 4037 df-pw 4110 df-sn 4126 df-pr 4128 df-tp 4130 df-op 4132 df-uni 4373 df-br 4584 df-opab 4644 df-tr 4681 df-eprel 4949 df-po 4959 df-so 4960 df-fr 4997 df-we 4999 df-ord 5643 df-on 5644 df-lim 5645 df-suc 5646 df-om 6958 df-1o 7447 |
This theorem is referenced by: 2onn 7607 oaabs2 7612 omabs 7614 nnm2 7616 nnneo 7618 nneob 7619 snfi 7923 snnen2o 8034 1sdom2 8044 1sdom 8048 unxpdom2 8053 en1eqsn 8075 en2 8081 pwfi 8144 wofib 8333 oancom 8431 cnfcom3clem 8485 card1 8677 pm54.43lem 8708 en2eleq 8714 en2other2 8715 infxpenlem 8719 infxpenc2lem1 8725 infmap2 8923 sdom2en01 9007 cfpwsdom 9285 canthp1lem2 9354 gchcda1 9357 pwxpndom2 9366 pwcdandom 9368 1pi 9584 1lt2pi 9606 indpi 9608 hash2 13054 hash1snb 13068 setcepi 16561 f1otrspeq 17690 pmtrf 17698 pmtrmvd 17699 pmtrfinv 17704 lt6abl 18119 isnzr2 19084 vr1cl 19408 ply1coe 19487 frgpcyg 19741 isppw 24640 bnj906 30254 finxpreclem1 32402 finxpreclem2 32403 finxp1o 32405 finxpreclem4 32407 finxp2o 32412 |
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