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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 11269 | . 2 ⊢ ((0 < 𝐴 ∧ 0 < 𝐵) → 0 < (𝐴 · 𝐵)) |
| 6 | 1, 2, 5 | mp2an 693 | 1 ⊢ 0 < (𝐴 · 𝐵) |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2114 class class class wbr 5086 (class class class)co 7360 ℝcr 11028 0cc0 11029 · cmul 11034 < clt 11170 |
| 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 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5231 ax-nul 5241 ax-pow 5302 ax-pr 5370 ax-un 7682 ax-resscn 11086 ax-1cn 11087 ax-addrcl 11090 ax-mulrcl 11092 ax-rnegex 11100 ax-cnre 11102 ax-pre-mulgt0 11106 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-br 5087 df-opab 5149 df-mpt 5168 df-id 5519 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-er 8636 df-en 8887 df-dom 8888 df-sdom 8889 df-pnf 11172 df-mnf 11173 df-ltxr 11175 |
| This theorem is referenced by: ef01bndlem 16142 efif1olem2 26520 efif1olem4 26522 ang180lem1 26786 ang180lem2 26787 chebbnd1lem3 27448 chebbnd1 27449 sinaover2ne0 46314 dirkercncflem4 46552 fourierdlem24 46577 fourierswlem 46676 fouriersw 46677 goldrapos 47345 |
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