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| Mirrors > Home > MPE Home > Th. List > Mathboxes > pnfinf | Structured version Visualization version GIF version | ||
| Description: Plus infinity is an infinite for the completed real line, as any real number is infinitesimal compared to it. (Contributed by Thierry Arnoux, 1-Feb-2018.) |
| Ref | Expression |
|---|---|
| pnfinf | ⊢ (𝐴 ∈ ℝ+ → 𝐴(⋘‘ℝ*𝑠)+∞) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | rpgt0 13026 | . 2 ⊢ (𝐴 ∈ ℝ+ → 0 < 𝐴) | |
| 2 | nnz 12614 | . . . . . . 7 ⊢ (𝑛 ∈ ℕ → 𝑛 ∈ ℤ) | |
| 3 | 2 | adantl 481 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝑛 ∈ ℕ) → 𝑛 ∈ ℤ) |
| 4 | rpxr 13023 | . . . . . . 7 ⊢ (𝐴 ∈ ℝ+ → 𝐴 ∈ ℝ*) | |
| 5 | 4 | adantr 480 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝑛 ∈ ℕ) → 𝐴 ∈ ℝ*) |
| 6 | xrsmulgzz 33006 | . . . . . 6 ⊢ ((𝑛 ∈ ℤ ∧ 𝐴 ∈ ℝ*) → (𝑛(.g‘ℝ*𝑠)𝐴) = (𝑛 ·e 𝐴)) | |
| 7 | 3, 5, 6 | syl2anc 584 | . . . . 5 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝑛 ∈ ℕ) → (𝑛(.g‘ℝ*𝑠)𝐴) = (𝑛 ·e 𝐴)) |
| 8 | 3 | zred 12702 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝑛 ∈ ℕ) → 𝑛 ∈ ℝ) |
| 9 | rpre 13022 | . . . . . . 7 ⊢ (𝐴 ∈ ℝ+ → 𝐴 ∈ ℝ) | |
| 10 | 9 | adantr 480 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝑛 ∈ ℕ) → 𝐴 ∈ ℝ) |
| 11 | rexmul 13292 | . . . . . . 7 ⊢ ((𝑛 ∈ ℝ ∧ 𝐴 ∈ ℝ) → (𝑛 ·e 𝐴) = (𝑛 · 𝐴)) | |
| 12 | remulcl 11219 | . . . . . . 7 ⊢ ((𝑛 ∈ ℝ ∧ 𝐴 ∈ ℝ) → (𝑛 · 𝐴) ∈ ℝ) | |
| 13 | 11, 12 | eqeltrd 2835 | . . . . . 6 ⊢ ((𝑛 ∈ ℝ ∧ 𝐴 ∈ ℝ) → (𝑛 ·e 𝐴) ∈ ℝ) |
| 14 | 8, 10, 13 | syl2anc 584 | . . . . 5 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝑛 ∈ ℕ) → (𝑛 ·e 𝐴) ∈ ℝ) |
| 15 | 7, 14 | eqeltrd 2835 | . . . 4 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝑛 ∈ ℕ) → (𝑛(.g‘ℝ*𝑠)𝐴) ∈ ℝ) |
| 16 | ltpnf 13141 | . . . 4 ⊢ ((𝑛(.g‘ℝ*𝑠)𝐴) ∈ ℝ → (𝑛(.g‘ℝ*𝑠)𝐴) < +∞) | |
| 17 | 15, 16 | syl 17 | . . 3 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝑛 ∈ ℕ) → (𝑛(.g‘ℝ*𝑠)𝐴) < +∞) |
| 18 | 17 | ralrimiva 3133 | . 2 ⊢ (𝐴 ∈ ℝ+ → ∀𝑛 ∈ ℕ (𝑛(.g‘ℝ*𝑠)𝐴) < +∞) |
| 19 | xrsex 21350 | . . . 4 ⊢ ℝ*𝑠 ∈ V | |
| 20 | pnfxr 11294 | . . . 4 ⊢ +∞ ∈ ℝ* | |
| 21 | xrsbas 21351 | . . . . 5 ⊢ ℝ* = (Base‘ℝ*𝑠) | |
| 22 | xrs0 33003 | . . . . 5 ⊢ 0 = (0g‘ℝ*𝑠) | |
| 23 | eqid 2736 | . . . . 5 ⊢ (.g‘ℝ*𝑠) = (.g‘ℝ*𝑠) | |
| 24 | xrslt 33004 | . . . . 5 ⊢ < = (lt‘ℝ*𝑠) | |
| 25 | 21, 22, 23, 24 | isinftm 33184 | . . . 4 ⊢ ((ℝ*𝑠 ∈ V ∧ 𝐴 ∈ ℝ* ∧ +∞ ∈ ℝ*) → (𝐴(⋘‘ℝ*𝑠)+∞ ↔ (0 < 𝐴 ∧ ∀𝑛 ∈ ℕ (𝑛(.g‘ℝ*𝑠)𝐴) < +∞))) |
| 26 | 19, 20, 25 | mp3an13 1454 | . . 3 ⊢ (𝐴 ∈ ℝ* → (𝐴(⋘‘ℝ*𝑠)+∞ ↔ (0 < 𝐴 ∧ ∀𝑛 ∈ ℕ (𝑛(.g‘ℝ*𝑠)𝐴) < +∞))) |
| 27 | 4, 26 | syl 17 | . 2 ⊢ (𝐴 ∈ ℝ+ → (𝐴(⋘‘ℝ*𝑠)+∞ ↔ (0 < 𝐴 ∧ ∀𝑛 ∈ ℕ (𝑛(.g‘ℝ*𝑠)𝐴) < +∞))) |
| 28 | 1, 18, 27 | mpbir2and 713 | 1 ⊢ (𝐴 ∈ ℝ+ → 𝐴(⋘‘ℝ*𝑠)+∞) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1540 ∈ wcel 2109 ∀wral 3052 Vcvv 3464 class class class wbr 5124 ‘cfv 6536 (class class class)co 7410 ℝcr 11133 0cc0 11134 · cmul 11139 +∞cpnf 11271 ℝ*cxr 11273 < clt 11274 ℕcn 12245 ℤcz 12593 ℝ+crp 13013 ·e cxmu 13132 ℝ*𝑠cxrs 17519 .gcmg 19055 ⋘cinftm 33179 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2708 ax-sep 5271 ax-nul 5281 ax-pow 5340 ax-pr 5407 ax-un 7734 ax-cnex 11190 ax-resscn 11191 ax-1cn 11192 ax-icn 11193 ax-addcl 11194 ax-addrcl 11195 ax-mulcl 11196 ax-mulrcl 11197 ax-mulcom 11198 ax-addass 11199 ax-mulass 11200 ax-distr 11201 ax-i2m1 11202 ax-1ne0 11203 ax-1rid 11204 ax-rnegex 11205 ax-rrecex 11206 ax-cnre 11207 ax-pre-lttri 11208 ax-pre-lttrn 11209 ax-pre-ltadd 11210 ax-pre-mulgt0 11211 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2540 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2810 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3062 df-rmo 3364 df-reu 3365 df-rab 3421 df-v 3466 df-sbc 3771 df-csb 3880 df-dif 3934 df-un 3936 df-in 3938 df-ss 3948 df-pss 3951 df-nul 4314 df-if 4506 df-pw 4582 df-sn 4607 df-pr 4609 df-tp 4611 df-op 4613 df-uni 4889 df-iun 4974 df-br 5125 df-opab 5187 df-mpt 5207 df-tr 5235 df-id 5553 df-eprel 5558 df-po 5566 df-so 5567 df-fr 5611 df-we 5613 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-pred 6295 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6489 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-riota 7367 df-ov 7413 df-oprab 7414 df-mpo 7415 df-om 7867 df-1st 7993 df-2nd 7994 df-frecs 8285 df-wrecs 8316 df-recs 8390 df-rdg 8429 df-1o 8485 df-er 8724 df-en 8965 df-dom 8966 df-sdom 8967 df-fin 8968 df-pnf 11276 df-mnf 11277 df-xr 11278 df-ltxr 11279 df-le 11280 df-sub 11473 df-neg 11474 df-nn 12246 df-2 12308 df-3 12309 df-4 12310 df-5 12311 df-6 12312 df-7 12313 df-8 12314 df-9 12315 df-n0 12507 df-z 12594 df-dec 12714 df-uz 12858 df-rp 13014 df-xneg 13133 df-xadd 13134 df-xmul 13135 df-fz 13530 df-seq 14025 df-struct 17171 df-slot 17206 df-ndx 17218 df-base 17234 df-plusg 17289 df-mulr 17290 df-tset 17295 df-ple 17296 df-ds 17298 df-0g 17460 df-xrs 17521 df-plt 18345 df-minusg 18925 df-mulg 19056 df-inftm 33181 |
| This theorem is referenced by: xrnarchi 33187 |
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