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Mirrors > Home > MPE Home > Th. List > fprodge0 | Structured version Visualization version GIF version |
Description: If all the terms of a finite product are nonnegative, so is the product. (Contributed by Glauco Siliprandi, 5-Apr-2020.) |
Ref | Expression |
---|---|
fprodge0.kph | ⊢ Ⅎ𝑘𝜑 |
fprodge0.a | ⊢ (𝜑 → 𝐴 ∈ Fin) |
fprodge0.b | ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝐵 ∈ ℝ) |
fprodge0.0leb | ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 0 ≤ 𝐵) |
Ref | Expression |
---|---|
fprodge0 | ⊢ (𝜑 → 0 ≤ ∏𝑘 ∈ 𝐴 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0xr 10739 | . 2 ⊢ 0 ∈ ℝ* | |
2 | pnfxr 10746 | . 2 ⊢ +∞ ∈ ℝ* | |
3 | fprodge0.kph | . . 3 ⊢ Ⅎ𝑘𝜑 | |
4 | rge0ssre 12901 | . . . . 5 ⊢ (0[,)+∞) ⊆ ℝ | |
5 | ax-resscn 10645 | . . . . 5 ⊢ ℝ ⊆ ℂ | |
6 | 4, 5 | sstri 3903 | . . . 4 ⊢ (0[,)+∞) ⊆ ℂ |
7 | 6 | a1i 11 | . . 3 ⊢ (𝜑 → (0[,)+∞) ⊆ ℂ) |
8 | ge0mulcl 12906 | . . . 4 ⊢ ((𝑥 ∈ (0[,)+∞) ∧ 𝑦 ∈ (0[,)+∞)) → (𝑥 · 𝑦) ∈ (0[,)+∞)) | |
9 | 8 | adantl 485 | . . 3 ⊢ ((𝜑 ∧ (𝑥 ∈ (0[,)+∞) ∧ 𝑦 ∈ (0[,)+∞))) → (𝑥 · 𝑦) ∈ (0[,)+∞)) |
10 | fprodge0.a | . . 3 ⊢ (𝜑 → 𝐴 ∈ Fin) | |
11 | fprodge0.b | . . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝐵 ∈ ℝ) | |
12 | fprodge0.0leb | . . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 0 ≤ 𝐵) | |
13 | elrege0 12899 | . . . 4 ⊢ (𝐵 ∈ (0[,)+∞) ↔ (𝐵 ∈ ℝ ∧ 0 ≤ 𝐵)) | |
14 | 11, 12, 13 | sylanbrc 586 | . . 3 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝐵 ∈ (0[,)+∞)) |
15 | 1re 10692 | . . . . 5 ⊢ 1 ∈ ℝ | |
16 | 0le1 11214 | . . . . 5 ⊢ 0 ≤ 1 | |
17 | ltpnf 12569 | . . . . . 6 ⊢ (1 ∈ ℝ → 1 < +∞) | |
18 | 15, 17 | ax-mp 5 | . . . . 5 ⊢ 1 < +∞ |
19 | 0re 10694 | . . . . . 6 ⊢ 0 ∈ ℝ | |
20 | elico2 12856 | . . . . . 6 ⊢ ((0 ∈ ℝ ∧ +∞ ∈ ℝ*) → (1 ∈ (0[,)+∞) ↔ (1 ∈ ℝ ∧ 0 ≤ 1 ∧ 1 < +∞))) | |
21 | 19, 2, 20 | mp2an 691 | . . . . 5 ⊢ (1 ∈ (0[,)+∞) ↔ (1 ∈ ℝ ∧ 0 ≤ 1 ∧ 1 < +∞)) |
22 | 15, 16, 18, 21 | mpbir3an 1338 | . . . 4 ⊢ 1 ∈ (0[,)+∞) |
23 | 22 | a1i 11 | . . 3 ⊢ (𝜑 → 1 ∈ (0[,)+∞)) |
24 | 3, 7, 9, 10, 14, 23 | fprodcllemf 15373 | . 2 ⊢ (𝜑 → ∏𝑘 ∈ 𝐴 𝐵 ∈ (0[,)+∞)) |
25 | icogelb 12843 | . 2 ⊢ ((0 ∈ ℝ* ∧ +∞ ∈ ℝ* ∧ ∏𝑘 ∈ 𝐴 𝐵 ∈ (0[,)+∞)) → 0 ≤ ∏𝑘 ∈ 𝐴 𝐵) | |
26 | 1, 2, 24, 25 | mp3an12i 1462 | 1 ⊢ (𝜑 → 0 ≤ ∏𝑘 ∈ 𝐴 𝐵) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 209 ∧ wa 399 ∧ w3a 1084 Ⅎwnf 1785 ∈ wcel 2111 ⊆ wss 3860 class class class wbr 5036 (class class class)co 7156 Fincfn 8540 ℂcc 10586 ℝcr 10587 0cc0 10588 1c1 10589 · cmul 10593 +∞cpnf 10723 ℝ*cxr 10725 < clt 10726 ≤ cle 10727 [,)cico 12794 ∏cprod 15320 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2729 ax-rep 5160 ax-sep 5173 ax-nul 5180 ax-pow 5238 ax-pr 5302 ax-un 7465 ax-inf2 9150 ax-cnex 10644 ax-resscn 10645 ax-1cn 10646 ax-icn 10647 ax-addcl 10648 ax-addrcl 10649 ax-mulcl 10650 ax-mulrcl 10651 ax-mulcom 10652 ax-addass 10653 ax-mulass 10654 ax-distr 10655 ax-i2m1 10656 ax-1ne0 10657 ax-1rid 10658 ax-rnegex 10659 ax-rrecex 10660 ax-cnre 10661 ax-pre-lttri 10662 ax-pre-lttrn 10663 ax-pre-ltadd 10664 ax-pre-mulgt0 10665 ax-pre-sup 10666 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3or 1085 df-3an 1086 df-tru 1541 df-fal 1551 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2557 df-eu 2588 df-clab 2736 df-cleq 2750 df-clel 2830 df-nfc 2901 df-ne 2952 df-nel 3056 df-ral 3075 df-rex 3076 df-reu 3077 df-rmo 3078 df-rab 3079 df-v 3411 df-sbc 3699 df-csb 3808 df-dif 3863 df-un 3865 df-in 3867 df-ss 3877 df-pss 3879 df-nul 4228 df-if 4424 df-pw 4499 df-sn 4526 df-pr 4528 df-tp 4530 df-op 4532 df-uni 4802 df-int 4842 df-iun 4888 df-br 5037 df-opab 5099 df-mpt 5117 df-tr 5143 df-id 5434 df-eprel 5439 df-po 5447 df-so 5448 df-fr 5487 df-se 5488 df-we 5489 df-xp 5534 df-rel 5535 df-cnv 5536 df-co 5537 df-dm 5538 df-rn 5539 df-res 5540 df-ima 5541 df-pred 6131 df-ord 6177 df-on 6178 df-lim 6179 df-suc 6180 df-iota 6299 df-fun 6342 df-fn 6343 df-f 6344 df-f1 6345 df-fo 6346 df-f1o 6347 df-fv 6348 df-isom 6349 df-riota 7114 df-ov 7159 df-oprab 7160 df-mpo 7161 df-om 7586 df-1st 7699 df-2nd 7700 df-wrecs 7963 df-recs 8024 df-rdg 8062 df-1o 8118 df-er 8305 df-en 8541 df-dom 8542 df-sdom 8543 df-fin 8544 df-sup 8952 df-oi 9020 df-card 9414 df-pnf 10728 df-mnf 10729 df-xr 10730 df-ltxr 10731 df-le 10732 df-sub 10923 df-neg 10924 df-div 11349 df-nn 11688 df-2 11750 df-3 11751 df-n0 11948 df-z 12034 df-uz 12296 df-rp 12444 df-ico 12798 df-fz 12953 df-fzo 13096 df-seq 13432 df-exp 13493 df-hash 13754 df-cj 14519 df-re 14520 df-im 14521 df-sqrt 14655 df-abs 14656 df-clim 14906 df-prod 15321 |
This theorem is referenced by: fprodle 15411 hoiprodcl 43597 hoiprodcl3 43630 hoidmvcl 43632 hsphoidmvle2 43635 hsphoidmvle 43636 |
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