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| Mirrors > Home > ILE Home > Th. List > omex | GIF version | ||
| Description: The existence of omega (the class of natural numbers). Axiom 7 of [TakeutiZaring] p. 43. (Contributed by NM, 6-Aug-1994.) |
| Ref | Expression |
|---|---|
| omex | ⊢ ω ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | zfinf2 4685 | . . 3 ⊢ ∃𝑦(∅ ∈ 𝑦 ∧ ∀𝑥 ∈ 𝑦 suc 𝑥 ∈ 𝑦) | |
| 2 | intexabim 4240 | . . 3 ⊢ (∃𝑦(∅ ∈ 𝑦 ∧ ∀𝑥 ∈ 𝑦 suc 𝑥 ∈ 𝑦) → ∩ {𝑦 ∣ (∅ ∈ 𝑦 ∧ ∀𝑥 ∈ 𝑦 suc 𝑥 ∈ 𝑦)} ∈ V) | |
| 3 | 1, 2 | ax-mp 5 | . 2 ⊢ ∩ {𝑦 ∣ (∅ ∈ 𝑦 ∧ ∀𝑥 ∈ 𝑦 suc 𝑥 ∈ 𝑦)} ∈ V |
| 4 | dfom3 4688 | . . 3 ⊢ ω = ∩ {𝑦 ∣ (∅ ∈ 𝑦 ∧ ∀𝑥 ∈ 𝑦 suc 𝑥 ∈ 𝑦)} | |
| 5 | 4 | eleq1i 2295 | . 2 ⊢ (ω ∈ V ↔ ∩ {𝑦 ∣ (∅ ∈ 𝑦 ∧ ∀𝑥 ∈ 𝑦 suc 𝑥 ∈ 𝑦)} ∈ V) |
| 6 | 3, 5 | mpbir 146 | 1 ⊢ ω ∈ V |
| Colors of variables: wff set class |
| Syntax hints: ∧ wa 104 ∃wex 1538 ∈ wcel 2200 {cab 2215 ∀wral 2508 Vcvv 2800 ∅c0 3492 ∩ cint 3926 suc csuc 4460 ωcom 4686 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-ext 2211 ax-sep 4205 ax-iinf 4684 |
| This theorem depends on definitions: df-bi 117 df-tru 1398 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ral 2513 df-v 2802 df-in 3204 df-ss 3211 df-int 3927 df-iom 4687 |
| This theorem is referenced by: peano5 4694 omelon 4705 frecex 6555 frecabex 6559 fict 7050 infnfi 7077 ominf 7078 inffiexmid 7091 omp1eom 7285 difinfsn 7290 0ct 7297 ctmlemr 7298 ctssdclemn0 7300 ctssdclemr 7302 ctssdc 7303 enumct 7305 omct 7307 ctfoex 7308 nninfex 7311 infnninf 7314 infnninfOLD 7315 nnnninf 7316 exmidlpo 7333 nninfdcinf 7361 nninfwlporlem 7363 nninfwlpoimlemg 7365 nninfwlpoim 7369 nninfinfwlpo 7370 cc2lem 7475 acnccim 7481 niex 7522 enq0ex 7649 nq0ex 7650 uzenom 10677 frecfzennn 10678 nnenom 10686 fxnn0nninf 10691 0tonninf 10692 1tonninf 10693 inftonninf 10694 nninfinf 10695 hashinfuni 11029 hashinfom 11030 nninfctlemfo 12601 nninfct 12602 xpct 13007 ennnfonelemj0 13012 ennnfonelemg 13014 ennnfonelemen 13032 ctiunct 13051 omctfn 13054 ssomct 13056 bj-charfunbi 16342 subctctexmid 16537 0nninf 16542 nnsf 16543 peano4nninf 16544 peano3nninf 16545 nninfself 16551 nninfsellemeq 16552 nninfsellemeqinf 16554 sbthom 16566 |
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