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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 12923 | . . . . 5 ⊢ (𝐴 ∈ ℝ+ → (𝐴 ∈ ℝ ∧ 𝐴 ≠ 0)) | |
| 2 | pnfxr 11186 | . . . . 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 33000 | . . 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 13206 | . . . . . . 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 12915 | . . . . . . . 8 ⊢ (𝐴 ∈ ℝ+ → 𝐴 ∈ ℝ*) | |
| 13 | rpgt0 12918 | . . . . . . . 8 ⊢ (𝐴 ∈ ℝ+ → 0 < 𝐴) | |
| 14 | xmulpnf1 13189 | . . . . . . . 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 5108 | . . . . 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 13188 | . . . . . 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 13080 | . . . . 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 13080 | . . . . 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 7344 | . 2 ⊢ (𝐴 ∈ ℝ+ → (℩𝑥 ∈ ℝ* (𝐴 ·e 𝑥) = +∞) = +∞) |
| 27 | 7, 26 | eqtrd 2771 | 1 ⊢ (𝐴 ∈ ℝ+ → (+∞ /𝑒 𝐴) = +∞) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∧ w3a 1086 = wceq 1541 ∈ wcel 2113 ≠ wne 2932 class class class wbr 5098 ℩crio 7314 (class class class)co 7358 ℝcr 11025 0cc0 11026 +∞cpnf 11163 ℝ*cxr 11165 < clt 11166 ≤ cle 11167 ℝ+crp 12905 ·e cxmu 13025 /𝑒 cxdiv 32998 |
| 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 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2184 ax-ext 2708 ax-sep 5241 ax-nul 5251 ax-pow 5310 ax-pr 5377 ax-un 7680 ax-cnex 11082 ax-resscn 11083 ax-1cn 11084 ax-icn 11085 ax-addcl 11086 ax-addrcl 11087 ax-mulcl 11088 ax-mulrcl 11089 ax-mulcom 11090 ax-addass 11091 ax-mulass 11092 ax-distr 11093 ax-i2m1 11094 ax-1ne0 11095 ax-1rid 11096 ax-rnegex 11097 ax-rrecex 11098 ax-cnre 11099 ax-pre-lttri 11100 ax-pre-lttrn 11101 ax-pre-ltadd 11102 ax-pre-mulgt0 11103 |
| 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 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3061 df-rmo 3350 df-reu 3351 df-rab 3400 df-v 3442 df-sbc 3741 df-csb 3850 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4581 df-pr 4583 df-op 4587 df-uni 4864 df-iun 4948 df-br 5099 df-opab 5161 df-mpt 5180 df-id 5519 df-po 5532 df-so 5533 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-riota 7315 df-ov 7361 df-oprab 7362 df-mpo 7363 df-1st 7933 df-2nd 7934 df-er 8635 df-en 8884 df-dom 8885 df-sdom 8886 df-pnf 11168 df-mnf 11169 df-xr 11170 df-ltxr 11171 df-le 11172 df-sub 11366 df-neg 11367 df-div 11795 df-rp 12906 df-xneg 13026 df-xmul 13028 df-xdiv 32999 |
| This theorem is referenced by: xrpxdivcld 33016 |
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