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Mirrors > Home > ILE Home > Th. List > xrex | Unicode version |
Description: The set of extended reals exists. (Contributed by NM, 24-Dec-2006.) |
Ref | Expression |
---|---|
xrex |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-xr 7797 | . 2 | |
2 | reex 7747 | . . 3 | |
3 | pnfxr 7811 | . . . 4 | |
4 | mnfxr 7815 | . . . 4 | |
5 | prexg 4128 | . . . 4 | |
6 | 3, 4, 5 | mp2an 422 | . . 3 |
7 | 2, 6 | unex 4357 | . 2 |
8 | 1, 7 | eqeltri 2210 | 1 |
Colors of variables: wff set class |
Syntax hints: wcel 1480 cvv 2681 cun 3064 cpr 3523 cr 7612 cpnf 7790 cmnf 7791 cxr 7792 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 ax-sep 4041 ax-pow 4093 ax-pr 4126 ax-un 4350 ax-cnex 7704 ax-resscn 7705 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-rex 2420 df-v 2683 df-un 3070 df-in 3072 df-ss 3079 df-pw 3507 df-sn 3528 df-pr 3529 df-uni 3732 df-pnf 7795 df-mnf 7796 df-xr 7797 |
This theorem is referenced by: ixxval 9672 ixxf 9674 ixxex 9675 ispsmet 12481 isxmet 12503 xmetunirn 12516 blfvalps 12543 blex 12545 |
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