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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 11235 | . 2 ⊢ ℝ* = (ℝ ∪ {+∞, -∞}) | |
| 2 | reex 11179 | . . 3 ⊢ ℝ ∈ V | |
| 3 | prex 5400 | . . 3 ⊢ {+∞, -∞} ∈ V | |
| 4 | 2, 3 | unex 7731 | . 2 ⊢ (ℝ ∪ {+∞, -∞}) ∈ V |
| 5 | 1, 4 | eqeltri 2861 | 1 ⊢ ℝ* ∈ V |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2145 Vcvv 3457 ∪ cun 3905 {cpr 4587 ℝcr 11087 +∞cpnf 11228 -∞cmnf 11229 ℝ*cxr 11230 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1818 ax-4 1832 ax-5 1933 ax-6 1990 ax-7 2031 ax-8 2147 ax-9 2155 ax-ext 2737 ax-sep 5251 ax-pr 5395 ax-un 7722 ax-cnex 11144 ax-resscn 11145 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1103 df-tru 1566 df-ex 1803 df-sb 2094 df-clab 2744 df-cleq 2757 df-clel 2840 df-rab 3418 df-v 3459 df-un 3912 df-in 3914 df-ss 3924 df-sn 4586 df-pr 4588 df-uni 4869 df-xr 11235 |
| This theorem is referenced by: ixxval 13371 ixxf 13373 ixxex 13374 limsuple 15519 limsuplt 15520 limsupbnd1 15523 prdsds 17507 xrsle 17648 xrsbas 17650 letsr 18639 xrsadd 21500 xrsmul 21501 xrsds 21520 xrs1mnd 21550 xrs10 21551 xrs1cmn 21552 xrge0subm 21553 xrge0cmn 21554 znle 21646 leordtval2 23330 lecldbas 23337 ispsmet 24422 isxmet 24442 imasdsf1olem 24491 blfvalps 24501 nmoffn 24829 nmofval 24832 xrsxmet 24928 xrge0gsumle 24952 xrge0tsms 24953 xrlimcnp 27091 xrge00 33247 xrge0tsmsd 33306 xrhval 34325 ltex 42873 leex 42874 icof 45793 elicores 46107 fuzxrpmcn 46400 gsumge0cl 46943 ovnval2b 47124 volicorescl 47125 ovnsubaddlem1 47142 |
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