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| Mirrors > Home > MPE Home > Th. List > xrex | Structured version Visualization version GIF version | ||
| Description: The set of extended reals exists. (Contributed by NM, 24-Dec-2006.) |
| Ref | Expression |
|---|---|
| xrex | ⊢ ℝ* ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-xr 11183 | . 2 ⊢ ℝ* = (ℝ ∪ {+∞, -∞}) | |
| 2 | reex 11129 | . . 3 ⊢ ℝ ∈ V | |
| 3 | prex 5380 | . . 3 ⊢ {+∞, -∞} ∈ V | |
| 4 | 2, 3 | unex 7698 | . 2 ⊢ (ℝ ∪ {+∞, -∞}) ∈ V |
| 5 | 1, 4 | eqeltri 2832 | 1 ⊢ ℝ* ∈ V |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2114 Vcvv 3429 ∪ cun 3887 {cpr 4569 ℝcr 11037 +∞cpnf 11176 -∞cmnf 11177 ℝ*cxr 11178 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2708 ax-sep 5231 ax-pr 5375 ax-un 7689 ax-cnex 11094 ax-resscn 11095 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-ex 1782 df-sb 2069 df-clab 2715 df-cleq 2728 df-clel 2811 df-rab 3390 df-v 3431 df-un 3894 df-in 3896 df-ss 3906 df-sn 4568 df-pr 4570 df-uni 4851 df-xr 11183 |
| This theorem is referenced by: ixxval 13306 ixxf 13308 ixxex 13309 limsuple 15440 limsuplt 15441 limsupbnd1 15444 prdsds 17427 xrsle 17568 xrsbas 17570 letsr 18559 xrsadd 21370 xrsmul 21371 xrsds 21390 xrs1mnd 21420 xrs10 21421 xrs1cmn 21422 xrge0subm 21423 xrge0cmn 21424 znle 21516 leordtval2 23177 lecldbas 23184 ispsmet 24269 isxmet 24289 imasdsf1olem 24338 blfvalps 24348 nmoffn 24676 nmofval 24679 xrsxmet 24775 xrge0gsumle 24799 xrge0tsms 24800 xrlimcnp 26932 xrge00 33074 xrge0tsmsd 33134 xrhval 34162 ltex 42684 leex 42685 icof 45648 elicores 45963 fuzxrpmcn 46256 gsumge0cl 46799 ovnval2b 46980 volicorescl 46981 ovnsubaddlem1 46998 |
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