Mathbox for Thierry Arnoux |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > xdivpnfrp | Structured version Visualization version GIF version |
Description: Plus infinity divided by a positive real number is plus infinity. (Contributed by Thierry Arnoux, 18-Dec-2016.) |
Ref | Expression |
---|---|
xdivpnfrp | ⊢ (𝐴 ∈ ℝ+ → (+∞ /𝑒 𝐴) = +∞) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rprene0 12747 | . . . . 5 ⊢ (𝐴 ∈ ℝ+ → (𝐴 ∈ ℝ ∧ 𝐴 ≠ 0)) | |
2 | pnfxr 11029 | . . . . 5 ⊢ +∞ ∈ ℝ* | |
3 | 1, 2 | jctil 520 | . . . 4 ⊢ (𝐴 ∈ ℝ+ → (+∞ ∈ ℝ* ∧ (𝐴 ∈ ℝ ∧ 𝐴 ≠ 0))) |
4 | 3anass 1094 | . . . 4 ⊢ ((+∞ ∈ ℝ* ∧ 𝐴 ∈ ℝ ∧ 𝐴 ≠ 0) ↔ (+∞ ∈ ℝ* ∧ (𝐴 ∈ ℝ ∧ 𝐴 ≠ 0))) | |
5 | 3, 4 | sylibr 233 | . . 3 ⊢ (𝐴 ∈ ℝ+ → (+∞ ∈ ℝ* ∧ 𝐴 ∈ ℝ ∧ 𝐴 ≠ 0)) |
6 | xdivval 31193 | . . 3 ⊢ ((+∞ ∈ ℝ* ∧ 𝐴 ∈ ℝ ∧ 𝐴 ≠ 0) → (+∞ /𝑒 𝐴) = (℩𝑥 ∈ ℝ* (𝐴 ·e 𝑥) = +∞)) | |
7 | 5, 6 | syl 17 | . 2 ⊢ (𝐴 ∈ ℝ+ → (+∞ /𝑒 𝐴) = (℩𝑥 ∈ ℝ* (𝐴 ·e 𝑥) = +∞)) |
8 | 2 | a1i 11 | . . 3 ⊢ (𝐴 ∈ ℝ+ → +∞ ∈ ℝ*) |
9 | xlemul2 13025 | . . . . . . 7 ⊢ ((+∞ ∈ ℝ* ∧ 𝑥 ∈ ℝ* ∧ 𝐴 ∈ ℝ+) → (+∞ ≤ 𝑥 ↔ (𝐴 ·e +∞) ≤ (𝐴 ·e 𝑥))) | |
10 | 2, 9 | mp3an1 1447 | . . . . . 6 ⊢ ((𝑥 ∈ ℝ* ∧ 𝐴 ∈ ℝ+) → (+∞ ≤ 𝑥 ↔ (𝐴 ·e +∞) ≤ (𝐴 ·e 𝑥))) |
11 | 10 | ancoms 459 | . . . . 5 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝑥 ∈ ℝ*) → (+∞ ≤ 𝑥 ↔ (𝐴 ·e +∞) ≤ (𝐴 ·e 𝑥))) |
12 | rpxr 12739 | . . . . . . . 8 ⊢ (𝐴 ∈ ℝ+ → 𝐴 ∈ ℝ*) | |
13 | rpgt0 12742 | . . . . . . . 8 ⊢ (𝐴 ∈ ℝ+ → 0 < 𝐴) | |
14 | xmulpnf1 13008 | . . . . . . . 8 ⊢ ((𝐴 ∈ ℝ* ∧ 0 < 𝐴) → (𝐴 ·e +∞) = +∞) | |
15 | 12, 13, 14 | syl2anc 584 | . . . . . . 7 ⊢ (𝐴 ∈ ℝ+ → (𝐴 ·e +∞) = +∞) |
16 | 15 | adantr 481 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝑥 ∈ ℝ*) → (𝐴 ·e +∞) = +∞) |
17 | 16 | breq1d 5084 | . . . . 5 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝑥 ∈ ℝ*) → ((𝐴 ·e +∞) ≤ (𝐴 ·e 𝑥) ↔ +∞ ≤ (𝐴 ·e 𝑥))) |
18 | 11, 17 | bitr2d 279 | . . . 4 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝑥 ∈ ℝ*) → (+∞ ≤ (𝐴 ·e 𝑥) ↔ +∞ ≤ 𝑥)) |
19 | xmulcl 13007 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ* ∧ 𝑥 ∈ ℝ*) → (𝐴 ·e 𝑥) ∈ ℝ*) | |
20 | 12, 19 | sylan 580 | . . . . 5 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝑥 ∈ ℝ*) → (𝐴 ·e 𝑥) ∈ ℝ*) |
21 | xgepnf 12899 | . . . . 5 ⊢ ((𝐴 ·e 𝑥) ∈ ℝ* → (+∞ ≤ (𝐴 ·e 𝑥) ↔ (𝐴 ·e 𝑥) = +∞)) | |
22 | 20, 21 | syl 17 | . . . 4 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝑥 ∈ ℝ*) → (+∞ ≤ (𝐴 ·e 𝑥) ↔ (𝐴 ·e 𝑥) = +∞)) |
23 | xgepnf 12899 | . . . . 5 ⊢ (𝑥 ∈ ℝ* → (+∞ ≤ 𝑥 ↔ 𝑥 = +∞)) | |
24 | 23 | adantl 482 | . . . 4 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝑥 ∈ ℝ*) → (+∞ ≤ 𝑥 ↔ 𝑥 = +∞)) |
25 | 18, 22, 24 | 3bitr3d 309 | . . 3 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝑥 ∈ ℝ*) → ((𝐴 ·e 𝑥) = +∞ ↔ 𝑥 = +∞)) |
26 | 8, 25 | riota5 7262 | . 2 ⊢ (𝐴 ∈ ℝ+ → (℩𝑥 ∈ ℝ* (𝐴 ·e 𝑥) = +∞) = +∞) |
27 | 7, 26 | eqtrd 2778 | 1 ⊢ (𝐴 ∈ ℝ+ → (+∞ /𝑒 𝐴) = +∞) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∧ w3a 1086 = wceq 1539 ∈ wcel 2106 ≠ wne 2943 class class class wbr 5074 ℩crio 7231 (class class class)co 7275 ℝcr 10870 0cc0 10871 +∞cpnf 11006 ℝ*cxr 11008 < clt 11009 ≤ cle 11010 ℝ+crp 12730 ·e cxmu 12847 /𝑒 cxdiv 31191 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-sep 5223 ax-nul 5230 ax-pow 5288 ax-pr 5352 ax-un 7588 ax-cnex 10927 ax-resscn 10928 ax-1cn 10929 ax-icn 10930 ax-addcl 10931 ax-addrcl 10932 ax-mulcl 10933 ax-mulrcl 10934 ax-mulcom 10935 ax-addass 10936 ax-mulass 10937 ax-distr 10938 ax-i2m1 10939 ax-1ne0 10940 ax-1rid 10941 ax-rnegex 10942 ax-rrecex 10943 ax-cnre 10944 ax-pre-lttri 10945 ax-pre-lttrn 10946 ax-pre-ltadd 10947 ax-pre-mulgt0 10948 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-nel 3050 df-ral 3069 df-rex 3070 df-rmo 3071 df-reu 3072 df-rab 3073 df-v 3434 df-sbc 3717 df-csb 3833 df-dif 3890 df-un 3892 df-in 3894 df-ss 3904 df-nul 4257 df-if 4460 df-pw 4535 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4840 df-iun 4926 df-br 5075 df-opab 5137 df-mpt 5158 df-id 5489 df-po 5503 df-so 5504 df-xp 5595 df-rel 5596 df-cnv 5597 df-co 5598 df-dm 5599 df-rn 5600 df-res 5601 df-ima 5602 df-iota 6391 df-fun 6435 df-fn 6436 df-f 6437 df-f1 6438 df-fo 6439 df-f1o 6440 df-fv 6441 df-riota 7232 df-ov 7278 df-oprab 7279 df-mpo 7280 df-1st 7831 df-2nd 7832 df-er 8498 df-en 8734 df-dom 8735 df-sdom 8736 df-pnf 11011 df-mnf 11012 df-xr 11013 df-ltxr 11014 df-le 11015 df-sub 11207 df-neg 11208 df-div 11633 df-rp 12731 df-xneg 12848 df-xmul 12850 df-xdiv 31192 |
This theorem is referenced by: xrpxdivcld 31209 |
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