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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 6559 frecabex 6563 fict 7054 infnfi 7083 ominf 7084 inffiexmid 7097 omp1eom 7293 difinfsn 7298 0ct 7305 ctmlemr 7306 ctssdclemn0 7308 ctssdclemr 7310 ctssdc 7311 enumct 7313 omct 7315 ctfoex 7316 nninfex 7319 infnninf 7322 infnninfOLD 7323 nnnninf 7324 exmidlpo 7341 nninfdcinf 7369 nninfwlporlem 7371 nninfwlpoimlemg 7373 nninfwlpoim 7377 nninfinfwlpo 7378 cc2lem 7484 acnccim 7490 niex 7531 enq0ex 7658 nq0ex 7659 uzenom 10686 frecfzennn 10687 nnenom 10695 fxnn0nninf 10700 0tonninf 10701 1tonninf 10702 inftonninf 10703 nninfinf 10704 hashinfuni 11038 hashinfom 11039 nninfctlemfo 12610 nninfct 12611 xpct 13016 ennnfonelemj0 13021 ennnfonelemg 13023 ennnfonelemen 13041 ctiunct 13060 omctfn 13063 ssomct 13065 bj-charfunbi 16406 subctctexmid 16601 0nninf 16606 nnsf 16607 peano4nninf 16608 peano3nninf 16609 nninfself 16615 nninfsellemeq 16616 nninfsellemeqinf 16618 sbthom 16630 |
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