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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 9957 | . 2 ⊢ ℝ* = (ℝ ∪ {+∞, -∞}) | |
2 | reex 9906 | . . 3 ⊢ ℝ ∈ V | |
3 | prex 4836 | . . 3 ⊢ {+∞, -∞} ∈ V | |
4 | 2, 3 | unex 6854 | . 2 ⊢ (ℝ ∪ {+∞, -∞}) ∈ V |
5 | 1, 4 | eqeltri 2684 | 1 ⊢ ℝ* ∈ V |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 1977 Vcvv 3173 ∪ cun 3538 {cpr 4127 ℝcr 9814 +∞cpnf 9950 -∞cmnf 9951 ℝ*cxr 9952 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-sep 4709 ax-nul 4717 ax-pr 4833 ax-un 6847 ax-cnex 9871 ax-resscn 9872 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-rex 2902 df-v 3175 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-sn 4126 df-pr 4128 df-uni 4373 df-xr 9957 |
This theorem is referenced by: ixxval 12054 ixxf 12056 ixxex 12057 limsuple 14057 limsuplt 14058 limsupbnd1 14061 prdsds 15947 letsr 17050 xrsbas 19581 xrsadd 19582 xrsmul 19583 xrsle 19585 xrs1mnd 19603 xrs10 19604 xrs1cmn 19605 xrge0subm 19606 xrge0cmn 19607 xrsds 19608 znle 19703 leordtval2 20826 lecldbas 20833 ispsmet 21919 isxmet 21939 imasdsf1olem 21988 blfvalps 21998 nmoffn 22325 nmofval 22328 xrsxmet 22420 xrge0gsumle 22444 xrge0tsms 22445 xrlimcnp 24495 xrge00 29017 xrge0tsmsd 29116 xrhval 29390 icof 38406 elicores 38607 gsumge0cl 39264 ovnval2b 39442 volicorescl 39443 ovnsubaddlem1 39460 |
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