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| Mirrors > Home > MPE Home > Th. List > pnfge | Structured version Visualization version GIF version | ||
| Description: Plus infinity is an upper bound for extended reals. (Contributed by NM, 30-Jan-2006.) |
| Ref | Expression |
|---|---|
| pnfge | ⊢ (𝐴 ∈ ℝ* → 𝐴 ≤ +∞) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pnfnlt 13257 | . 2 ⊢ (𝐴 ∈ ℝ* → ¬ +∞ < 𝐴) | |
| 2 | pnfxr 11363 | . . 3 ⊢ +∞ ∈ ℝ* | |
| 3 | xrlenlt 11374 | . . 3 ⊢ ((𝐴 ∈ ℝ* ∧ +∞ ∈ ℝ*) → (𝐴 ≤ +∞ ↔ ¬ +∞ < 𝐴)) | |
| 4 | 2, 3 | mpan2 704 | . 2 ⊢ (𝐴 ∈ ℝ* → (𝐴 ≤ +∞ ↔ ¬ +∞ < 𝐴)) |
| 5 | 1, 4 | mpbird 260 | 1 ⊢ (𝐴 ∈ ℝ* → 𝐴 ≤ +∞) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ↔ wb 209 ∈ wcel 2145 class class class wbr 5103 +∞cpnf 11340 ℝ*cxr 11342 < clt 11343 ≤ cle 11344 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2733 ax-sep 5249 ax-pow 5327 ax-pr 5391 ax-un 7751 ax-cnex 11256 ax-resscn 11257 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-clab 2740 df-cleq 2753 df-clel 2836 df-ne 2957 df-nel 3063 df-ral 3078 df-rex 3088 df-rab 3414 df-v 3453 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5104 df-opab 5168 df-xp 5657 df-cnv 5659 df-pnf 11345 df-mnf 11346 df-xr 11347 df-ltxr 11348 df-le 11349 |
| This theorem is used by: pnfged 13260 xnn0n0n1ge2b 13261 0lepnf 13262 nltpnft 13294 xrre2 13300 xnn0lem1lt 13374 xleadd1a 13383 xlt2add 13390 xsubge0 13391 xlesubadd 13393 xlemul1a 13418 elicore 13529 elico2 13541 iccmax 13554 elxrge0 13588 nfile 14503 hashdom 14523 hashdomi 14524 hashge1 14533 hashss 14553 hashge2el2difr 14626 pcdvdsb 17047 pc2dvds 17057 pcaddlem 17066 xrsdsreclblem 21719 leordtvallem1 23528 lecldbas 23537 isxmet2d 24646 blssec 24754 nmoix 25048 nmoleub 25050 xrtgioo 25126 xrge0tsms 25154 metdstri 25171 nmoleub2lem 25435 ovolf 25803 ovollb2 25810 ovoliun 25826 ovolre 25846 voliunlem3 25873 volsup 25877 icombl 25885 ioombl 25886 ismbfd 25960 itg2seq 26063 dvfsumrlim 26351 dvfsumrlim2 26352 radcnvcl 26744 logfacbnd3 27550 log2sumbnd 27871 tgldimor 28965 xrdifh 33372 xrge0tsmsd 33634 unitssxrge0 34532 tpr2rico 34544 lmxrge0 34584 esumle 34690 esumlef 34694 esumpinfval 34705 esumpinfsum 34709 esumcvgsum 34720 ddemeas 34869 sxbrsigalem2 34918 omssubadd 34932 carsgclctunlem3 34952 signsply0 35180 ismblfin 38579 xrgepnfd 46342 supxrgelem 46348 supxrge 46349 infrpge 46362 xrlexaddrp 46363 infleinflem1 46380 infleinf 46382 infxrpnf 46455 ge0xrre 46542 iblsplit 46975 ismbl3 46995 ovolsplit 46997 sge0cl 47390 sge0less 47401 sge0pr 47403 sge0le 47416 sge0split 47418 carageniuncl 47532 ovnsubaddlem1 47579 hspmbl 47638 pgrpgt2nabl 49477 |
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