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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 4716 | . . 3 ⊢ ∃𝑦(∅ ∈ 𝑦 ∧ ∀𝑥 ∈ 𝑦 suc 𝑥 ∈ 𝑦) | |
| 2 | intexabim 4269 | . . 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 4719 | . . 3 ⊢ ω = ∩ {𝑦 ∣ (∅ ∈ 𝑦 ∧ ∀𝑥 ∈ 𝑦 suc 𝑥 ∈ 𝑦)} | |
| 5 | 4 | eleq1i 2300 | . 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 1541 ∈ wcel 2205 {cab 2220 ∀wral 2522 Vcvv 2815 ∅c0 3512 ∩ cint 3954 suc csuc 4491 ωcom 4717 |
| 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 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-ext 2216 ax-sep 4233 ax-iinf 4715 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ral 2527 df-v 2817 df-in 3220 df-ss 3227 df-int 3955 df-iom 4718 |
| This theorem is referenced by: peano5 4725 omelon 4736 frecex 6638 frecabex 6642 fict 7136 infnfi 7165 ominf 7166 inffiexmid 7179 omp1eom 7399 difinfsn 7404 0ct 7411 ctmlemr 7412 ctssdclemn0 7414 ctssdclemr 7416 ctssdc 7417 enumct 7419 omct 7421 ctfoex 7422 nninfex 7425 infnninf 7428 infnninfOLD 7429 nnnninf 7430 exmidlpo 7447 nninfdcinf 7475 nninfwlporlem 7477 nninfwlpoimlemg 7479 nninfwlpoim 7483 nninfinfwlpo 7484 cc2lem 7596 acnccim 7602 niex 7643 enq0ex 7770 nq0ex 7771 uzenom 10811 frecfzennn 10812 nnenom 10820 fxnn0nninf 10825 0tonninf 10826 1tonninf 10827 inftonninf 10828 nninfinf 10829 hashinfuni 11165 hashinfom 11166 nninfctlemfo 12761 nninfct 12762 xpct 13231 ennnfonelemj0 13236 ennnfonelemg 13238 ennnfonelemen 13256 ctiunct 13275 omctfn 13278 ssomct 13280 bj-charfunbi 16707 subctctexmid 16900 0nninf 16908 nnsf 16909 peano4nninf 16910 peano3nninf 16911 nninfself 16917 nninfsellemeq 16918 nninfsellemeqinf 16920 sbthom 16932 |
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