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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 9569 | . 2 ⊢ ℕ0 = (ℕ ∪ {0}) | |
| 2 | nnex 9313 | . . 3 ⊢ ℕ ∈ V | |
| 3 | c0ex 8321 | . . . 4 ⊢ 0 ∈ V | |
| 4 | 3 | snex 4322 | . . 3 ⊢ {0} ∈ V |
| 5 | 2, 4 | unex 4587 | . 2 ⊢ (ℕ ∪ {0}) ∈ V |
| 6 | 1, 5 | eqeltri 2311 | 1 ⊢ ℕ0 ∈ V |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: ∈ wcel 2209 Vcvv 2821 ∪ cun 3218 {csn 3709 0cc0 8180 ℕcn 9307 ℕ0cn0 9568 |
| This proof depends on 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-14 2212 ax-ext 2220 ax-sep 4249 ax-pow 4311 ax-pr 4346 ax-un 4578 ax-cnex 8271 ax-resscn 8272 ax-1cn 8273 ax-1re 8274 ax-icn 8275 ax-addcl 8276 ax-addrcl 8277 ax-mulcl 8278 ax-i2m1 8285 |
| This proof 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-rex 2534 df-v 2823 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-uni 3936 df-int 3971 df-inn 9308 df-n0 9569 |
| This theorem is used by: nn0ennn 10885 nnenom 10886 uzennn 10888 xnn0nnen 10889 wrdexg 11331 expcnvap0 12288 expcnvre 12289 expcnv 12290 geolim 12297 mertenslem2 12322 eftlub 12476 bitsfval 12728 bitsf 12732 1arith 13169 znnen 13341 psrval 15134 fnpsr 15135 psrbag 15137 psrbagaddclfi 15145 psrbaglefifi 15147 psrbasg 15150 psrelbas 15151 psrplusgg 15154 psraddcl 15156 psrmulrg 15158 psrmulfval 15159 psrmulclfilem 15161 psr0cl 15163 psr0lid 15164 psrnegcl 15165 psrlinv 15166 psrgrp 15167 psr1clfi 15170 mplsubgfilemm 15180 mplsubgfilemcl 15181 plyval 15924 elply2 15927 plyf 15929 elplyr 15932 plyaddlem1 15939 plyaddlem 15941 plymullem 15942 plyco 15951 plycj 15953 plyrecj 15955 clwwlknonmpo 16835 depindlem1 16913 depindlem2 16914 |
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