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Mirrors > Home > MPE Home > Th. List > ltpnf | Structured version Visualization version GIF version |
Description: Any (finite) real is less than plus infinity. (Contributed by NM, 14-Oct-2005.) |
Ref | Expression |
---|---|
ltpnf | ⊢ (𝐴 ∈ ℝ → 𝐴 < +∞) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid 2622 | . . . 4 ⊢ +∞ = +∞ | |
2 | orc 400 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ +∞ = +∞) → ((𝐴 ∈ ℝ ∧ +∞ = +∞) ∨ (𝐴 = -∞ ∧ +∞ ∈ ℝ))) | |
3 | 1, 2 | mpan2 707 | . . 3 ⊢ (𝐴 ∈ ℝ → ((𝐴 ∈ ℝ ∧ +∞ = +∞) ∨ (𝐴 = -∞ ∧ +∞ ∈ ℝ))) |
4 | 3 | olcd 408 | . 2 ⊢ (𝐴 ∈ ℝ → ((((𝐴 ∈ ℝ ∧ +∞ ∈ ℝ) ∧ 𝐴 <ℝ +∞) ∨ (𝐴 = -∞ ∧ +∞ = +∞)) ∨ ((𝐴 ∈ ℝ ∧ +∞ = +∞) ∨ (𝐴 = -∞ ∧ +∞ ∈ ℝ)))) |
5 | rexr 10085 | . . 3 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℝ*) | |
6 | pnfxr 10092 | . . 3 ⊢ +∞ ∈ ℝ* | |
7 | ltxr 11949 | . . 3 ⊢ ((𝐴 ∈ ℝ* ∧ +∞ ∈ ℝ*) → (𝐴 < +∞ ↔ ((((𝐴 ∈ ℝ ∧ +∞ ∈ ℝ) ∧ 𝐴 <ℝ +∞) ∨ (𝐴 = -∞ ∧ +∞ = +∞)) ∨ ((𝐴 ∈ ℝ ∧ +∞ = +∞) ∨ (𝐴 = -∞ ∧ +∞ ∈ ℝ))))) | |
8 | 5, 6, 7 | sylancl 694 | . 2 ⊢ (𝐴 ∈ ℝ → (𝐴 < +∞ ↔ ((((𝐴 ∈ ℝ ∧ +∞ ∈ ℝ) ∧ 𝐴 <ℝ +∞) ∨ (𝐴 = -∞ ∧ +∞ = +∞)) ∨ ((𝐴 ∈ ℝ ∧ +∞ = +∞) ∨ (𝐴 = -∞ ∧ +∞ ∈ ℝ))))) |
9 | 4, 8 | mpbird 247 | 1 ⊢ (𝐴 ∈ ℝ → 𝐴 < +∞) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 196 ∨ wo 383 ∧ wa 384 = wceq 1483 ∈ wcel 1990 class class class wbr 4653 ℝcr 9935 <ℝ cltrr 9940 +∞cpnf 10071 -∞cmnf 10072 ℝ*cxr 10073 < clt 10074 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 ax-un 6949 ax-cnex 9992 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ral 2917 df-rex 2918 df-rab 2921 df-v 3202 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-op 4184 df-uni 4437 df-br 4654 df-opab 4713 df-xp 5120 df-pnf 10076 df-xr 10078 df-ltxr 10079 |
This theorem is referenced by: ltpnfd 11955 0ltpnf 11956 xrlttri 11972 xrlttr 11973 xrrebnd 11999 xrre 12000 qbtwnxr 12031 xltnegi 12047 xrinfmsslem 12138 xrub 12142 supxrunb1 12149 supxrunb2 12150 elioc2 12236 elicc2 12238 ioomax 12248 ioopos 12250 elioopnf 12267 elicopnf 12269 difreicc 12304 hashbnd 13123 hashnnn0genn0 13131 hashv01gt1 13133 fprodge0 14724 fprodge1 14726 pcadd 15593 ramubcl 15722 rge0srg 19817 mnfnei 21025 xblss2ps 22206 icopnfcld 22571 iocmnfcld 22572 blcvx 22601 xrtgioo 22609 reconnlem1 22629 xrge0tsms 22637 iccpnfhmeo 22744 ioombl1lem4 23329 icombl1 23331 uniioombllem1 23349 mbfmax 23416 ismbf3d 23421 itg2seq 23509 lhop2 23778 dvfsumlem2 23790 logccv 24409 xrlimcnp 24695 pntleme 25297 upgrfi 25986 topnfbey 27325 isblo3i 27656 htthlem 27774 xlt2addrd 29523 dfrp2 29532 fsumrp0cl 29695 pnfinf 29737 xrge0tsmsd 29785 xrge0slmod 29844 xrge0iifcnv 29979 xrge0iifiso 29981 xrge0iifhom 29983 lmxrge0 29998 esumcst 30125 esumcvgre 30153 voliune 30292 volfiniune 30293 sxbrsigalem0 30333 orvcgteel 30529 dstfrvclim1 30539 itg2addnclem2 33462 asindmre 33495 dvasin 33496 dvacos 33497 rfcnpre3 39192 supxrgere 39549 supxrgelem 39553 xrlexaddrp 39568 infxr 39583 limsupre 39873 limsuppnfdlem 39933 limsuppnflem 39942 liminflelimsupuz 40017 icccncfext 40100 fourierdlem111 40434 fourierdlem113 40436 fouriersw 40448 sge0iunmptlemre 40632 sge0rpcpnf 40638 sge0xaddlem1 40650 meaiuninclem 40697 hoidmvlelem5 40813 ovolval5lem1 40866 pimltpnf 40916 iccpartiltu 41358 |
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