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| Mirrors > Home > ILE Home > Th. List > nn0ex | GIF version | ||
| Description: The set of nonnegative integers exists. (Contributed by NM, 18-Jul-2004.) | 
| Ref | Expression | 
|---|---|
| nn0ex | ⊢ ℕ0 ∈ V | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | df-n0 9250 | . 2 ⊢ ℕ0 = (ℕ ∪ {0}) | |
| 2 | nnex 8996 | . . 3 ⊢ ℕ ∈ V | |
| 3 | c0ex 8020 | . . . 4 ⊢ 0 ∈ V | |
| 4 | 3 | snex 4218 | . . 3 ⊢ {0} ∈ V | 
| 5 | 2, 4 | unex 4476 | . 2 ⊢ (ℕ ∪ {0}) ∈ V | 
| 6 | 1, 5 | eqeltri 2269 | 1 ⊢ ℕ0 ∈ V | 
| Colors of variables: wff set class | 
| Syntax hints: ∈ wcel 2167 Vcvv 2763 ∪ cun 3155 {csn 3622 0cc0 7879 ℕcn 8990 ℕ0cn0 9249 | 
| 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 710 ax-5 1461 ax-7 1462 ax-gen 1463 ax-ie1 1507 ax-ie2 1508 ax-8 1518 ax-10 1519 ax-11 1520 ax-i12 1521 ax-bndl 1523 ax-4 1524 ax-17 1540 ax-i9 1544 ax-ial 1548 ax-i5r 1549 ax-13 2169 ax-14 2170 ax-ext 2178 ax-sep 4151 ax-pow 4207 ax-pr 4242 ax-un 4468 ax-cnex 7970 ax-resscn 7971 ax-1cn 7972 ax-1re 7973 ax-icn 7974 ax-addcl 7975 ax-addrcl 7976 ax-mulcl 7977 ax-i2m1 7984 | 
| This theorem depends on definitions: df-bi 117 df-tru 1367 df-nf 1475 df-sb 1777 df-clab 2183 df-cleq 2189 df-clel 2192 df-nfc 2328 df-ral 2480 df-rex 2481 df-v 2765 df-un 3161 df-in 3163 df-ss 3170 df-pw 3607 df-sn 3628 df-pr 3629 df-uni 3840 df-int 3875 df-inn 8991 df-n0 9250 | 
| This theorem is referenced by: nn0ennn 10525 nnenom 10526 uzennn 10528 xnn0nnen 10529 wrdexg 10946 expcnvap0 11667 expcnvre 11668 expcnv 11669 geolim 11676 mertenslem2 11701 eftlub 11855 bitsfval 12107 bitsf 12111 1arith 12536 znnen 12615 psrval 14220 fnpsr 14221 psrbag 14223 psrbasg 14227 psrelbas 14228 psrplusgg 14230 psraddcl 14232 plyval 14968 elply2 14971 plyf 14973 elplyr 14976 plyaddlem1 14983 plyaddlem 14985 plymullem 14986 plyco 14995 plycj 14997 plyrecj 14999 | 
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