Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > ILE Home > Th. List > pnfxr | Unicode version |
Description: Plus infinity belongs to the set of extended reals. (Contributed by NM, 13-Oct-2005.) (Proof shortened by Anthony Hart, 29-Aug-2011.) |
Ref | Expression |
---|---|
pnfxr |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssun2 3235 | . . 3 | |
2 | df-pnf 7795 | . . . . 5 | |
3 | cnex 7737 | . . . . . . 7 | |
4 | 3 | uniex 4354 | . . . . . 6 |
5 | 4 | pwex 4102 | . . . . 5 |
6 | 2, 5 | eqeltri 2210 | . . . 4 |
7 | 6 | prid1 3624 | . . 3 |
8 | 1, 7 | sselii 3089 | . 2 |
9 | df-xr 7797 | . 2 | |
10 | 8, 9 | eleqtrri 2213 | 1 |
Colors of variables: wff set class |
Syntax hints: wcel 1480 cvv 2681 cun 3064 cpw 3505 cpr 3523 cuni 3731 cc 7611 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-un 4350 ax-cnex 7704 |
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-xr 7797 |
This theorem is referenced by: pnfex 7812 pnfnemnf 7813 xnn0xr 9038 xrltnr 9559 ltpnf 9560 mnfltpnf 9564 pnfnlt 9566 pnfge 9568 xrlttri3 9576 nltpnft 9590 xgepnf 9592 xrrebnd 9595 xrre 9596 xrre2 9597 xnegcl 9608 xaddf 9620 xaddval 9621 xaddpnf1 9622 xaddpnf2 9623 pnfaddmnf 9626 mnfaddpnf 9627 xrex 9632 xaddass2 9646 xltadd1 9652 xlt2add 9656 xsubge0 9657 xposdif 9658 xleaddadd 9663 elioc2 9712 elico2 9713 elicc2 9714 ioomax 9724 iccmax 9725 ioopos 9726 elioopnf 9743 elicopnf 9745 unirnioo 9749 elxrge0 9754 hashinfom 10517 rexico 10986 xrmaxiflemcl 11007 xrmaxadd 11023 xblpnfps 12556 xblpnf 12557 xblss2ps 12562 blssec 12596 blpnfctr 12597 reopnap 12696 blssioo 12703 |
Copyright terms: Public domain | W3C validator |