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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 10678 | . 2 ⊢ ℝ* = (ℝ ∪ {+∞, -∞}) | |
2 | reex 10627 | . . 3 ⊢ ℝ ∈ V | |
3 | prex 5332 | . . 3 ⊢ {+∞, -∞} ∈ V | |
4 | 2, 3 | unex 7468 | . 2 ⊢ (ℝ ∪ {+∞, -∞}) ∈ V |
5 | 1, 4 | eqeltri 2909 | 1 ⊢ ℝ* ∈ V |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2110 Vcvv 3494 ∪ cun 3933 {cpr 4568 ℝcr 10535 +∞cpnf 10671 -∞cmnf 10672 ℝ*cxr 10673 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-sep 5202 ax-nul 5209 ax-pr 5329 ax-un 7460 ax-cnex 10592 ax-resscn 10593 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-rab 3147 df-v 3496 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-nul 4291 df-sn 4567 df-pr 4569 df-uni 4838 df-xr 10678 |
This theorem is referenced by: ixxval 12745 ixxf 12747 ixxex 12748 limsuple 14834 limsuplt 14835 limsupbnd1 14838 prdsds 16736 letsr 17836 xrsbas 20560 xrsadd 20561 xrsmul 20562 xrsle 20564 xrs1mnd 20582 xrs10 20583 xrs1cmn 20584 xrge0subm 20585 xrge0cmn 20586 xrsds 20587 znle 20682 leordtval2 21819 lecldbas 21826 ispsmet 22913 isxmet 22933 imasdsf1olem 22982 blfvalps 22992 nmoffn 23319 nmofval 23322 xrsxmet 23416 xrge0gsumle 23440 xrge0tsms 23441 xrlimcnp 25545 xrge00 30673 xrge0tsmsd 30692 xrhval 31259 icof 41480 elicores 41807 fuzxrpmcn 42107 gsumge0cl 42652 ovnval2b 42833 volicorescl 42834 ovnsubaddlem1 42851 |
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