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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 10890 nnenom 10891 uzennn 10893 xnn0nnen 10894 wrdexg 11336 expcnvap0 12293 expcnvre 12294 expcnv 12295 geolim 12302 mertenslem2 12327 eftlub 12481 bitsfval 12733 bitsf 12737 1arith 13174 znnen 13346 psrval 15160 fnpsr 15161 psrbag 15163 snifpsrbagfi 15168 psrbagaddclfi 15173 psrbaglefifi 15175 psrbagmaxlem1 15178 psrbagmaxlemfi 15180 psrbasg 15187 psrelbas 15188 psrplusgg 15191 psraddcl 15193 psrmulrg 15195 psrmulfval 15196 psrmulclfilem 15198 psr0cl 15200 psr0lid 15201 psrnegcl 15202 psrlinv 15203 psrgrp 15204 psr1clfi 15207 psrdifi 15211 psrdirfi 15212 mvrval 15215 mvrffi 15218 mvrclfi 15226 plyval 15975 elply2 15978 plyf 15980 elplyr 15983 plyaddlem1 15990 plyaddlem 15992 plymullem 15993 plyco 16002 plycj 16004 plyrecj 16006 clwwlknonmpo 16891 depindlem1 16969 depindlem2 16970 |
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