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Mirrors > Home > MPE Home > Th. List > rpdivcl | Structured version Visualization version GIF version |
Description: Closure law for division of positive reals. (Contributed by FL, 27-Dec-2007.) |
Ref | Expression |
---|---|
rpdivcl | ⊢ ((𝐴 ∈ ℝ+ ∧ 𝐵 ∈ ℝ+) → (𝐴 / 𝐵) ∈ ℝ+) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rpre 12667 | . . 3 ⊢ (𝐴 ∈ ℝ+ → 𝐴 ∈ ℝ) | |
2 | rprene0 12676 | . . 3 ⊢ (𝐵 ∈ ℝ+ → (𝐵 ∈ ℝ ∧ 𝐵 ≠ 0)) | |
3 | redivcl 11624 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐵 ≠ 0) → (𝐴 / 𝐵) ∈ ℝ) | |
4 | 3 | 3expb 1118 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ (𝐵 ∈ ℝ ∧ 𝐵 ≠ 0)) → (𝐴 / 𝐵) ∈ ℝ) |
5 | 1, 2, 4 | syl2an 595 | . 2 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝐵 ∈ ℝ+) → (𝐴 / 𝐵) ∈ ℝ) |
6 | elrp 12661 | . . 3 ⊢ (𝐴 ∈ ℝ+ ↔ (𝐴 ∈ ℝ ∧ 0 < 𝐴)) | |
7 | elrp 12661 | . . 3 ⊢ (𝐵 ∈ ℝ+ ↔ (𝐵 ∈ ℝ ∧ 0 < 𝐵)) | |
8 | divgt0 11773 | . . 3 ⊢ (((𝐴 ∈ ℝ ∧ 0 < 𝐴) ∧ (𝐵 ∈ ℝ ∧ 0 < 𝐵)) → 0 < (𝐴 / 𝐵)) | |
9 | 6, 7, 8 | syl2anb 597 | . 2 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝐵 ∈ ℝ+) → 0 < (𝐴 / 𝐵)) |
10 | elrp 12661 | . 2 ⊢ ((𝐴 / 𝐵) ∈ ℝ+ ↔ ((𝐴 / 𝐵) ∈ ℝ ∧ 0 < (𝐴 / 𝐵))) | |
11 | 5, 9, 10 | sylanbrc 582 | 1 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝐵 ∈ ℝ+) → (𝐴 / 𝐵) ∈ ℝ+) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 395 ∈ wcel 2108 ≠ wne 2942 class class class wbr 5070 (class class class)co 7255 ℝcr 10801 0cc0 10802 < clt 10940 / cdiv 11562 ℝ+crp 12659 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-resscn 10859 ax-1cn 10860 ax-icn 10861 ax-addcl 10862 ax-addrcl 10863 ax-mulcl 10864 ax-mulrcl 10865 ax-mulcom 10866 ax-addass 10867 ax-mulass 10868 ax-distr 10869 ax-i2m1 10870 ax-1ne0 10871 ax-1rid 10872 ax-rnegex 10873 ax-rrecex 10874 ax-cnre 10875 ax-pre-lttri 10876 ax-pre-lttrn 10877 ax-pre-ltadd 10878 ax-pre-mulgt0 10879 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-reu 3070 df-rmo 3071 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-op 4565 df-uni 4837 df-br 5071 df-opab 5133 df-mpt 5154 df-id 5480 df-po 5494 df-so 5495 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-er 8456 df-en 8692 df-dom 8693 df-sdom 8694 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946 df-sub 11137 df-neg 11138 df-div 11563 df-rp 12660 |
This theorem is referenced by: rpreccl 12685 rphalfcl 12686 rpdivcld 12718 bcrpcl 13950 sqrlem7 14888 caurcvgr 15313 isprm5 16340 4sqlem12 16585 sylow1lem1 19118 metss2lem 23573 metss2 23574 minveclem3 24498 ovoliunlem3 24573 vitalilem4 24680 aaliou3lem8 25410 abelthlem8 25503 pigt3 25579 pige3ALT 25581 advlogexp 25715 atan1 25983 log2cnv 25999 cxp2limlem 26030 harmonicbnd4 26065 basellem1 26135 logexprlim 26278 logfacrlim2 26279 bcmono 26330 bposlem1 26337 bposlem7 26343 bposlem9 26345 rplogsumlem1 26537 dchrisumlem3 26544 dchrvmasum2lem 26549 dchrvmasum2if 26550 dchrvmasumlem2 26551 dchrvmasumlem3 26552 dchrvmasumiflem2 26555 dchrisum0lem2a 26570 dchrisum0lem2 26571 mudivsum 26583 mulogsumlem 26584 mulogsum 26585 mulog2sumlem1 26587 mulog2sumlem2 26588 mulog2sumlem3 26589 selberglem1 26598 selberglem2 26599 selberg 26601 selberg3lem1 26610 selbergr 26621 pntpbnd1a 26638 pntibndlem1 26642 pntibndlem3 26645 pntlema 26649 pntlemb 26650 pntlemg 26651 pntlemr 26655 pntlemj 26656 pntlemf 26658 smcnlem 28960 blocnilem 29067 minvecolem3 29139 nmcexi 30289 rpdp2cl 31058 dp2ltc 31063 dpgti 31082 circum 33532 faclim 33618 taupilem1 35419 poimirlem29 35733 mblfinlem3 35743 itg2addnclem2 35756 itg2addnclem3 35757 ftc1anclem7 35783 ftc1anc 35785 heiborlem5 35900 heiborlem7 35902 proot1ex 40942 |
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