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| 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 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | zfinf2 4731 |
. . 3
| |
| 2 | intexabim 4283 |
. . 3
| |
| 3 | 1, 2 | ax-mp 5 |
. 2
|
| 4 | dfom3 4734 |
. . 3
| |
| 5 | 4 | eleq1i 2304 |
. 2
|
| 6 | 3, 5 | mpbir 146 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| 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 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 ax-sep 4244 ax-iinf 4730 |
| This theorem depends on definitions: df-bi 117 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-v 2823 df-in 3226 df-ss 3233 df-int 3966 df-iom 4733 |
| This theorem is referenced by: peano5 4740 omelon 4751 frecex 6655 frecabex 6659 fict 7160 infnfi 7189 ominf 7190 inffiexmid 7203 omp1eom 7425 difinfsn 7430 0ct 7437 ctmlemr 7438 ctssdclemn0 7440 ctssdclemr 7442 ctssdc 7443 enumct 7445 omct 7447 ctfoex 7448 nninfex 7451 infnninf 7454 infnninfOLD 7455 nnnninf 7456 exmidlpo 7473 nninfdcinf 7501 nninfwlporlem 7503 nninfwlpoimlemg 7505 nninfwlpoim 7509 nninfinfwlpo 7510 cc2lem 7622 acnccim 7628 niex 7669 enq0ex 7796 nq0ex 7797 uzenom 10840 frecfzennn 10841 nnenom 10849 fxnn0nninf 10854 0tonninf 10855 1tonninf 10856 inftonninf 10857 nninfinf 10858 hashinfuni 11194 hashinfom 11195 nninfctlemfo 12795 nninfct 12796 xpct 13265 ennnfonelemj0 13270 ennnfonelemg 13272 ennnfonelemen 13290 ctiunct 13309 omctfn 13312 ssomct 13314 bj-charfunbi 16751 subctctexmid 16944 0nninf 16952 nnsf 16953 peano4nninf 16954 peano3nninf 16955 nninfself 16961 nninfsellemeq 16962 nninfsellemeqinf 16964 sbthom 16976 |
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