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Mirrors > Home > MPE Home > Th. List > mulgt0ii | Structured version Visualization version GIF version |
Description: The product of two positive numbers is positive. (Contributed by NM, 18-May-1999.) |
Ref | Expression |
---|---|
lt.1 | ⊢ 𝐴 ∈ ℝ |
lt.2 | ⊢ 𝐵 ∈ ℝ |
mulgt0i.3 | ⊢ 0 < 𝐴 |
mulgt0i.4 | ⊢ 0 < 𝐵 |
Ref | Expression |
---|---|
mulgt0ii | ⊢ 0 < (𝐴 · 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | mulgt0i.3 | . 2 ⊢ 0 < 𝐴 | |
2 | mulgt0i.4 | . 2 ⊢ 0 < 𝐵 | |
3 | lt.1 | . . 3 ⊢ 𝐴 ∈ ℝ | |
4 | lt.2 | . . 3 ⊢ 𝐵 ∈ ℝ | |
5 | 3, 4 | mulgt0i 11037 | . 2 ⊢ ((0 < 𝐴 ∧ 0 < 𝐵) → 0 < (𝐴 · 𝐵)) |
6 | 1, 2, 5 | mp2an 688 | 1 ⊢ 0 < (𝐴 · 𝐵) |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2108 class class class wbr 5070 (class class class)co 7255 ℝcr 10801 0cc0 10802 · cmul 10807 < clt 10940 |
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-addrcl 10863 ax-mulrcl 10865 ax-rnegex 10873 ax-cnre 10875 ax-pre-mulgt0 10879 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 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-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-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-er 8456 df-en 8692 df-dom 8693 df-sdom 8694 df-pnf 10942 df-mnf 10943 df-ltxr 10945 |
This theorem is referenced by: ef01bndlem 15821 efif1olem2 25604 efif1olem4 25606 ang180lem1 25864 ang180lem2 25865 chebbnd1lem3 26524 chebbnd1 26525 sinaover2ne0 43299 dirkercncflem4 43537 fourierdlem24 43562 fourierswlem 43661 fouriersw 43662 |
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