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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 4681 | . . 3 ⊢ ∃𝑦(∅ ∈ 𝑦 ∧ ∀𝑥 ∈ 𝑦 suc 𝑥 ∈ 𝑦) | |
| 2 | intexabim 4236 | . . 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 4684 | . . 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 2799 ∅c0 3491 ∩ cint 3923 suc csuc 4456 ωcom 4682 |
| 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 4202 ax-iinf 4680 |
| 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 2801 df-in 3203 df-ss 3210 df-int 3924 df-iom 4683 |
| This theorem is referenced by: peano5 4690 omelon 4701 frecex 6546 frecabex 6550 fict 7038 infnfi 7065 ominf 7066 inffiexmid 7079 omp1eom 7273 difinfsn 7278 0ct 7285 ctmlemr 7286 ctssdclemn0 7288 ctssdclemr 7290 ctssdc 7291 enumct 7293 omct 7295 ctfoex 7296 nninfex 7299 infnninf 7302 infnninfOLD 7303 nnnninf 7304 exmidlpo 7321 nninfdcinf 7349 nninfwlporlem 7351 nninfwlpoimlemg 7353 nninfwlpoim 7357 nninfinfwlpo 7358 cc2lem 7463 acnccim 7469 niex 7510 enq0ex 7637 nq0ex 7638 uzenom 10659 frecfzennn 10660 nnenom 10668 fxnn0nninf 10673 0tonninf 10674 1tonninf 10675 inftonninf 10676 nninfinf 10677 hashinfuni 11011 hashinfom 11012 nninfctlemfo 12576 nninfct 12577 xpct 12982 ennnfonelemj0 12987 ennnfonelemg 12989 ennnfonelemen 13007 ctiunct 13026 omctfn 13029 ssomct 13031 bj-charfunbi 16229 subctctexmid 16425 0nninf 16430 nnsf 16431 peano4nninf 16432 peano3nninf 16433 nninfself 16439 nninfsellemeq 16440 nninfsellemeqinf 16442 sbthom 16454 |
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