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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 10205 |
. 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 10208 xnn0dcle 10220 xnn0letri 10221 xrre2 10239 xleadd1a 10291 xltadd1 10294 xlt2add 10298 xsubge0 10299 xlesubadd 10301 xleaddadd 10305 elico2 10355 iccmax 10367 elxrge0 10396 elicore 10717 xqltnle 10718 xrmaxifle 12036 xrmaxadd 12051 xrbdtri 12066 pcdvdsb 13127 pc2dvds 13137 pcaddlem 13146 isxmet2d 15591 blssec 15681 |
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