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| Mirrors > Home > ILE Home > Th. List > pnfge | Unicode version | ||
| Description: Plus infinity is an upper bound for extended reals. (Contributed by NM, 30-Jan-2006.) |
| Ref | Expression |
|---|---|
| pnfge |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pnfnlt 10206 |
. 2
| |
| 2 | pnfxr 8384 |
. . 3
| |
| 3 | xrlenlt 8396 |
. . 3
| |
| 4 | 2, 3 | mpan2 429 |
. 2
|
| 5 | 1, 4 | mpbird 167 |
1
|
| Colors of variables: wff set class |
| This proof depends on syntax axioms:
|
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4251 ax-pow 4313 ax-pr 4348 ax-un 4580 ax-cnex 8276 ax-resscn 8277 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-rab 2537 df-v 2823 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-br 4132 df-opab 4194 df-xp 4782 df-cnv 4784 df-pnf 8368 df-mnf 8369 df-xr 8370 df-ltxr 8371 df-le 8372 |
| This theorem is used by: 0lepnf 10209 xnn0dcle 10221 xnn0letri 10222 xrre2 10240 xleadd1a 10292 xltadd1 10295 xlt2add 10299 xsubge0 10300 xlesubadd 10302 xleaddadd 10306 elico2 10356 iccmax 10368 elxrge0 10397 elicore 10718 xqltnle 10719 xrmaxifle 12037 xrmaxadd 12052 xrbdtri 12067 pcdvdsb 13128 pc2dvds 13138 pcaddlem 13147 isxmet2d 15574 blssec 15664 |
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