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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 7064 | . 2 | |
2 | reex 7015 | . . 3 | |
3 | pnfxr 8692 | . . . 4 | |
4 | mnfxr 8694 | . . . 4 | |
5 | prexg 3947 | . . . 4 | |
6 | 3, 4, 5 | mp2an 402 | . . 3 |
7 | 2, 6 | unex 4176 | . 2 |
8 | 1, 7 | eqeltri 2110 | 1 |
Colors of variables: wff set class |
Syntax hints: wcel 1393 cvv 2557 cun 2915 cpr 3376 cr 6888 cpnf 7057 cmnf 7058 cxr 7059 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-io 630 ax-5 1336 ax-7 1337 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-8 1395 ax-10 1396 ax-11 1397 ax-i12 1398 ax-bndl 1399 ax-4 1400 ax-13 1404 ax-14 1405 ax-17 1419 ax-i9 1423 ax-ial 1427 ax-i5r 1428 ax-ext 2022 ax-sep 3875 ax-pow 3927 ax-pr 3944 ax-un 4170 ax-cnex 6975 ax-resscn 6976 |
This theorem depends on definitions: df-bi 110 df-tru 1246 df-nf 1350 df-sb 1646 df-clab 2027 df-cleq 2033 df-clel 2036 df-nfc 2167 df-rex 2312 df-v 2559 df-un 2922 df-in 2924 df-ss 2931 df-pw 3361 df-sn 3381 df-pr 3382 df-uni 3581 df-pnf 7062 df-mnf 7063 df-xr 7064 |
This theorem is referenced by: ixxval 8765 ixxf 8767 ixxex 8768 |
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