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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 12908 | . . . . 5 ⊢ (𝐴 ∈ ℝ+ → (𝐴 ∈ ℝ ∧ 𝐴 ≠ 0)) | |
| 2 | pnfxr 11166 | . . . . 5 ⊢ +∞ ∈ ℝ* | |
| 3 | 1, 2 | jctil 519 | . . . 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 234 | . . 3 ⊢ (𝐴 ∈ ℝ+ → (+∞ ∈ ℝ* ∧ 𝐴 ∈ ℝ ∧ 𝐴 ≠ 0)) |
| 6 | xdivval 32897 | . . 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 13190 | . . . . . . 7 ⊢ ((+∞ ∈ ℝ* ∧ 𝑥 ∈ ℝ* ∧ 𝐴 ∈ ℝ+) → (+∞ ≤ 𝑥 ↔ (𝐴 ·e +∞) ≤ (𝐴 ·e 𝑥))) | |
| 10 | 2, 9 | mp3an1 1450 | . . . . . 6 ⊢ ((𝑥 ∈ ℝ* ∧ 𝐴 ∈ ℝ+) → (+∞ ≤ 𝑥 ↔ (𝐴 ·e +∞) ≤ (𝐴 ·e 𝑥))) |
| 11 | 10 | ancoms 458 | . . . . 5 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝑥 ∈ ℝ*) → (+∞ ≤ 𝑥 ↔ (𝐴 ·e +∞) ≤ (𝐴 ·e 𝑥))) |
| 12 | rpxr 12900 | . . . . . . . 8 ⊢ (𝐴 ∈ ℝ+ → 𝐴 ∈ ℝ*) | |
| 13 | rpgt0 12903 | . . . . . . . 8 ⊢ (𝐴 ∈ ℝ+ → 0 < 𝐴) | |
| 14 | xmulpnf1 13173 | . . . . . . . 8 ⊢ ((𝐴 ∈ ℝ* ∧ 0 < 𝐴) → (𝐴 ·e +∞) = +∞) | |
| 15 | 12, 13, 14 | syl2anc 584 | . . . . . . 7 ⊢ (𝐴 ∈ ℝ+ → (𝐴 ·e +∞) = +∞) |
| 16 | 15 | adantr 480 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝑥 ∈ ℝ*) → (𝐴 ·e +∞) = +∞) |
| 17 | 16 | breq1d 5101 | . . . . 5 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝑥 ∈ ℝ*) → ((𝐴 ·e +∞) ≤ (𝐴 ·e 𝑥) ↔ +∞ ≤ (𝐴 ·e 𝑥))) |
| 18 | 11, 17 | bitr2d 280 | . . . 4 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝑥 ∈ ℝ*) → (+∞ ≤ (𝐴 ·e 𝑥) ↔ +∞ ≤ 𝑥)) |
| 19 | xmulcl 13172 | . . . . . 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 13064 | . . . . 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 13064 | . . . . 5 ⊢ (𝑥 ∈ ℝ* → (+∞ ≤ 𝑥 ↔ 𝑥 = +∞)) | |
| 24 | 23 | adantl 481 | . . . 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 7332 | . 2 ⊢ (𝐴 ∈ ℝ+ → (℩𝑥 ∈ ℝ* (𝐴 ·e 𝑥) = +∞) = +∞) |
| 27 | 7, 26 | eqtrd 2766 | 1 ⊢ (𝐴 ∈ ℝ+ → (+∞ /𝑒 𝐴) = +∞) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∧ w3a 1086 = wceq 1541 ∈ wcel 2111 ≠ wne 2928 class class class wbr 5091 ℩crio 7302 (class class class)co 7346 ℝcr 11005 0cc0 11006 +∞cpnf 11143 ℝ*cxr 11145 < clt 11146 ≤ cle 11147 ℝ+crp 12890 ·e cxmu 13010 /𝑒 cxdiv 32895 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-sep 5234 ax-nul 5244 ax-pow 5303 ax-pr 5370 ax-un 7668 ax-cnex 11062 ax-resscn 11063 ax-1cn 11064 ax-icn 11065 ax-addcl 11066 ax-addrcl 11067 ax-mulcl 11068 ax-mulrcl 11069 ax-mulcom 11070 ax-addass 11071 ax-mulass 11072 ax-distr 11073 ax-i2m1 11074 ax-1ne0 11075 ax-1rid 11076 ax-rnegex 11077 ax-rrecex 11078 ax-cnre 11079 ax-pre-lttri 11080 ax-pre-lttrn 11081 ax-pre-ltadd 11082 ax-pre-mulgt0 11083 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-nel 3033 df-ral 3048 df-rex 3057 df-rmo 3346 df-reu 3347 df-rab 3396 df-v 3438 df-sbc 3742 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4284 df-if 4476 df-pw 4552 df-sn 4577 df-pr 4579 df-op 4583 df-uni 4860 df-iun 4943 df-br 5092 df-opab 5154 df-mpt 5173 df-id 5511 df-po 5524 df-so 5525 df-xp 5622 df-rel 5623 df-cnv 5624 df-co 5625 df-dm 5626 df-rn 5627 df-res 5628 df-ima 5629 df-iota 6437 df-fun 6483 df-fn 6484 df-f 6485 df-f1 6486 df-fo 6487 df-f1o 6488 df-fv 6489 df-riota 7303 df-ov 7349 df-oprab 7350 df-mpo 7351 df-1st 7921 df-2nd 7922 df-er 8622 df-en 8870 df-dom 8871 df-sdom 8872 df-pnf 11148 df-mnf 11149 df-xr 11150 df-ltxr 11151 df-le 11152 df-sub 11346 df-neg 11347 df-div 11775 df-rp 12891 df-xneg 13011 df-xmul 13013 df-xdiv 32896 |
| This theorem is referenced by: xrpxdivcld 32913 |
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