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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 9564 | . 2 ⊢ ℕ0 = (ℕ ∪ {0}) | |
| 2 | nnex 9310 | . . 3 ⊢ ℕ ∈ V | |
| 3 | c0ex 8320 | . . . 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 8179 ℕcn 9304 ℕ0cn0 9563 |
| 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 8270 ax-resscn 8271 ax-1cn 8272 ax-1re 8273 ax-icn 8274 ax-addcl 8275 ax-addrcl 8276 ax-mulcl 8277 ax-i2m1 8284 |
| 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 9305 df-n0 9564 |
| This theorem is used by: nn0ennn 10870 nnenom 10871 uzennn 10873 xnn0nnen 10874 wrdexg 11315 expcnvap0 12269 expcnvre 12270 expcnv 12271 geolim 12278 mertenslem2 12303 eftlub 12457 bitsfval 12709 bitsf 12713 1arith 13146 znnen 13289 psrval 15050 fnpsr 15051 psrbag 15053 psrbagaddclfi 15061 psrbasg 15065 psrelbas 15066 psrplusgg 15069 psraddcl 15071 psr0cl 15072 psr0lid 15073 psrnegcl 15074 psrlinv 15075 psrgrp 15076 psr1clfi 15079 mplsubgfilemm 15089 mplsubgfilemcl 15090 plyval 15833 elply2 15836 plyf 15838 elplyr 15841 plyaddlem1 15848 plyaddlem 15850 plymullem 15851 plyco 15860 plycj 15862 plyrecj 15864 clwwlknonmpo 16669 depindlem1 16747 depindlem2 16748 |
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