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Mirrors > Home > ILE Home > Th. List > 1onn | 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 6321 | . 2 ⊢ 1o = suc ∅ | |
2 | peano1 4516 | . . 3 ⊢ ∅ ∈ ω | |
3 | peano2 4517 | . . 3 ⊢ (∅ ∈ ω → suc ∅ ∈ ω) | |
4 | 2, 3 | ax-mp 5 | . 2 ⊢ suc ∅ ∈ ω |
5 | 1, 4 | eqeltri 2213 | 1 ⊢ 1o ∈ ω |
Colors of variables: wff set class |
Syntax hints: ∈ wcel 1481 ∅c0 3368 suc csuc 4295 ωcom 4512 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-3an 965 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-int 3780 df-suc 4301 df-iom 4513 df-1o 6321 |
This theorem is referenced by: 2onn 6425 nnm2 6429 nnaordex 6431 snfig 6716 snnen2og 6761 1nen2 6763 unfiexmid 6814 en1eqsn 6844 omp1eomlem 6987 fodjum 7026 fodju0 7027 en2eleq 7068 en2other2 7069 exmidfodomrlemr 7075 exmidfodomrlemrALT 7076 1pi 7147 1lt2pi 7172 archnqq 7249 nq0m0r 7288 nq02m 7297 prarloclemlt 7325 prarloclemlo 7326 1tonninf 10244 hash2 10590 012of 13363 pwle2 13366 peano3nninf 13376 nninfall 13379 nninfsellemdc 13381 nninfsellemeq 13385 nninfsellemeqinf 13387 nninffeq 13391 sbthom 13396 isomninnlem 13400 iswomninnlem 13417 ismkvnnlem 13419 |
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