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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 13267 | . 2 ⊢ (𝐴 ∈ ℝ* → ¬ +∞ < 𝐴) | |
| 2 | pnfxr 11373 | . . 3 ⊢ +∞ ∈ ℝ* | |
| 3 | xrlenlt 11384 | . . 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 2146 class class class wbr 5105 +∞cpnf 11350 ℝ*cxr 11352 < clt 11353 ≤ cle 11354 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1944 ax-6 2001 ax-7 2042 ax-8 2148 ax-9 2156 ax-ext 2735 ax-sep 5251 ax-pow 5330 ax-pr 5394 ax-un 7758 ax-cnex 11266 ax-resscn 11267 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-sb 2101 df-clab 2742 df-cleq 2755 df-clel 2838 df-ne 2959 df-nel 3065 df-ral 3080 df-rex 3090 df-rab 3416 df-v 3455 df-ss 3900 df-dif 4049 df-in 4093 df-un 4153 df-nul 4281 df-if 4485 df-pw 4561 df-sn 4588 df-pr 4590 df-op 4838 df-uni 4870 df-br 5106 df-opab 5170 df-xp 5660 df-cnv 5662 df-pnf 11355 df-mnf 11356 df-xr 11357 df-ltxr 11358 df-le 11359 |
| This theorem is used by: pnfged 13270 xnn0n0n1ge2b 13271 0lepnf 13272 nltpnft 13304 xrre2 13310 xnn0lem1lt 13384 xleadd1a 13393 xlt2add 13400 xsubge0 13401 xlesubadd 13403 xlemul1a 13428 elicore 13539 elico2 13551 iccmax 13564 elxrge0 13598 nfile 14513 hashdom 14533 hashdomi 14534 hashge1 14543 hashss 14563 hashge2el2difr 14636 pcdvdsb 17059 pc2dvds 17069 pcaddlem 17078 xrsdsreclblem 21731 leordtvallem1 23540 lecldbas 23549 isxmet2d 24658 blssec 24766 nmoix 25060 nmoleub 25062 xrtgioo 25138 xrge0tsms 25166 metdstri 25183 nmoleub2lem 25447 ovolf 25815 ovollb2 25822 ovoliun 25838 ovolre 25858 voliunlem3 25885 volsup 25889 icombl 25897 ioombl 25898 ismbfd 25972 itg2seq 26075 dvfsumrlim 26363 dvfsumrlim2 26364 radcnvcl 26756 logfacbnd3 27562 log2sumbnd 27883 tgldimor 28977 xrdifh 33425 xrge0tsmsd 33687 unitssxrge0 34585 tpr2rico 34597 lmxrge0 34637 esumle 34743 esumlef 34747 esumpinfval 34758 esumpinfsum 34762 esumcvgsum 34773 ddemeas 34922 sxbrsigalem2 34971 carsgclctunlem3 35005 signsply0 35233 ismblfin 38719 xrgepnfd 46482 supxrgelem 46488 supxrge 46489 infrpge 46502 xrlexaddrp 46503 infleinflem1 46520 infleinf 46522 infxrpnf 46595 ge0xrre 46682 iblsplit 47115 ismbl3 47135 ovolsplit 47137 sge0cl 47530 sge0less 47541 sge0pr 47543 sge0le 47556 sge0split 47558 carageniuncl 47672 ovnsubaddlem1 47719 hspmbl 47778 pgrpgt2nabl 49617 |
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