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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 9575 | . 2 ⊢ ℕ0 = (ℕ ∪ {0}) | |
| 2 | nnex 9319 | . . 3 ⊢ ℕ ∈ V | |
| 3 | c0ex 8326 | . . . 4 ⊢ 0 ∈ V | |
| 4 | 3 | snex 4324 | . . 3 ⊢ {0} ∈ V |
| 5 | 2, 4 | unex 4589 | . 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 8185 ℕcn 9313 ℕ0cn0 9574 |
| 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 4251 ax-pow 4313 ax-pr 4348 ax-un 4580 ax-cnex 8276 ax-resscn 8277 ax-1cn 8278 ax-1re 8279 ax-icn 8280 ax-addcl 8281 ax-addrcl 8282 ax-mulcl 8283 ax-i2m1 8290 |
| 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 9314 df-n0 9575 |
| This theorem is used by: nn0ennn 10891 nnenom 10892 uzennn 10894 xnn0nnen 10895 wrdexg 11337 expcnvap0 12294 expcnvre 12295 expcnv 12296 geolim 12303 mertenslem2 12328 eftlub 12482 bitsfval 12734 bitsf 12738 1arith 13175 znnen 13347 psrval 15159 fnpsr 15160 psrbag 15162 psrbagaddclfi 15170 psrbaglefifi 15172 psrbasg 15178 psrelbas 15179 psrplusgg 15182 psraddcl 15184 psrmulrg 15186 psrmulfval 15187 psrmulclfilem 15189 psr0cl 15191 psr0lid 15192 psrnegcl 15193 psrlinv 15194 psrgrp 15195 psr1clfi 15198 psrdifi 15202 psrdirfi 15203 mplsubgfilemm 15214 mplsubgfilemcl 15215 plyval 15958 elply2 15961 plyf 15963 elplyr 15966 plyaddlem1 15973 plyaddlem 15975 plymullem 15976 plyco 15985 plycj 15987 plyrecj 15989 clwwlknonmpo 16874 depindlem1 16952 depindlem2 16953 |
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