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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 4693 | . . 3 ⊢ ∃𝑦(∅ ∈ 𝑦 ∧ ∀𝑥 ∈ 𝑦 suc 𝑥 ∈ 𝑦) | |
| 2 | intexabim 4247 | . . 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 4696 | . . 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 1541 ∈ wcel 2202 {cab 2217 ∀wral 2511 Vcvv 2803 ∅c0 3496 ∩ cint 3933 suc csuc 4468 ωcom 4694 |
| 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 2213 ax-sep 4212 ax-iinf 4692 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-ral 2516 df-v 2805 df-in 3207 df-ss 3214 df-int 3934 df-iom 4695 |
| This theorem is referenced by: peano5 4702 omelon 4713 frecex 6603 frecabex 6607 fict 7098 infnfi 7127 ominf 7128 inffiexmid 7141 omp1eom 7337 difinfsn 7342 0ct 7349 ctmlemr 7350 ctssdclemn0 7352 ctssdclemr 7354 ctssdc 7355 enumct 7357 omct 7359 ctfoex 7360 nninfex 7363 infnninf 7366 infnninfOLD 7367 nnnninf 7368 exmidlpo 7385 nninfdcinf 7413 nninfwlporlem 7415 nninfwlpoimlemg 7417 nninfwlpoim 7421 nninfinfwlpo 7422 cc2lem 7528 acnccim 7534 niex 7575 enq0ex 7702 nq0ex 7703 uzenom 10733 frecfzennn 10734 nnenom 10742 fxnn0nninf 10747 0tonninf 10748 1tonninf 10749 inftonninf 10750 nninfinf 10751 hashinfuni 11085 hashinfom 11086 nninfctlemfo 12674 nninfct 12675 xpct 13080 ennnfonelemj0 13085 ennnfonelemg 13087 ennnfonelemen 13105 ctiunct 13124 omctfn 13127 ssomct 13129 bj-charfunbi 16510 subctctexmid 16705 0nninf 16713 nnsf 16714 peano4nninf 16715 peano3nninf 16716 nninfself 16722 nninfsellemeq 16723 nninfsellemeqinf 16725 sbthom 16737 |
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