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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 4687 | . . 3 ⊢ ∃𝑦(∅ ∈ 𝑦 ∧ ∀𝑥 ∈ 𝑦 suc 𝑥 ∈ 𝑦) | |
| 2 | intexabim 4242 | . . 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 4690 | . . 3 ⊢ ω = ∩ {𝑦 ∣ (∅ ∈ 𝑦 ∧ ∀𝑥 ∈ 𝑦 suc 𝑥 ∈ 𝑦)} | |
| 5 | 4 | eleq1i 2297 | . 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 1540 ∈ wcel 2202 {cab 2217 ∀wral 2510 Vcvv 2802 ∅c0 3494 ∩ cint 3928 suc csuc 4462 ωcom 4688 |
| 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 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-ext 2213 ax-sep 4207 ax-iinf 4686 |
| This theorem depends on definitions: df-bi 117 df-tru 1400 df-nf 1509 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ral 2515 df-v 2804 df-in 3206 df-ss 3213 df-int 3929 df-iom 4689 |
| This theorem is referenced by: peano5 4696 omelon 4707 frecex 6560 frecabex 6564 fict 7055 infnfi 7084 ominf 7085 inffiexmid 7098 omp1eom 7294 difinfsn 7299 0ct 7306 ctmlemr 7307 ctssdclemn0 7309 ctssdclemr 7311 ctssdc 7312 enumct 7314 omct 7316 ctfoex 7317 nninfex 7320 infnninf 7323 infnninfOLD 7324 nnnninf 7325 exmidlpo 7342 nninfdcinf 7370 nninfwlporlem 7372 nninfwlpoimlemg 7374 nninfwlpoim 7378 nninfinfwlpo 7379 cc2lem 7485 acnccim 7491 niex 7532 enq0ex 7659 nq0ex 7660 uzenom 10688 frecfzennn 10689 nnenom 10697 fxnn0nninf 10702 0tonninf 10703 1tonninf 10704 inftonninf 10705 nninfinf 10706 hashinfuni 11040 hashinfom 11041 nninfctlemfo 12616 nninfct 12617 xpct 13022 ennnfonelemj0 13027 ennnfonelemg 13029 ennnfonelemen 13047 ctiunct 13066 omctfn 13069 ssomct 13071 bj-charfunbi 16432 subctctexmid 16627 0nninf 16632 nnsf 16633 peano4nninf 16634 peano3nninf 16635 nninfself 16641 nninfsellemeq 16642 nninfsellemeqinf 16644 sbthom 16656 |
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