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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 11341 | . 2 ⊢ ((0 < 𝐴 ∧ 0 < 𝐵) → 0 < (𝐴 · 𝐵)) |
| 6 | 1, 2, 5 | mp2an 704 | 1 ⊢ 0 < (𝐴 · 𝐵) |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2149 class class class wbr 5113 (class class class)co 7411 ℝcr 11098 0cc0 11099 · cmul 11104 < clt 11242 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-10 2182 ax-11 2198 ax-12 2219 ax-ext 2741 ax-sep 5261 ax-nul 5271 ax-pow 5337 ax-pr 5405 ax-un 7733 ax-resscn 11156 ax-1cn 11157 ax-addrcl 11160 ax-mulrcl 11162 ax-rnegex 11170 ax-cnre 11172 ax-pre-mulgt0 11176 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-nf 1811 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-nfc 2918 df-ne 2965 df-nel 3071 df-ral 3086 df-rex 3096 df-rab 3424 df-v 3465 df-sbc 3754 df-csb 3862 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-nul 4295 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4877 df-br 5114 df-opab 5178 df-mpt 5197 df-id 5557 df-xp 5668 df-rel 5669 df-cnv 5670 df-co 5671 df-dm 5672 df-rn 5673 df-res 5674 df-ima 5675 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-er 8693 df-en 8943 df-dom 8944 df-sdom 8945 df-pnf 11244 df-mnf 11245 df-ltxr 11247 |
| This theorem is referenced by: ef01bndlem 16239 efif1olem2 26673 efif1olem4 26675 ang180lem1 26939 ang180lem2 26940 chebbnd1lem3 27600 chebbnd1 27601 sinaover2ne0 46473 dirkercncflem4 46711 fourierdlem24 46736 fourierswlem 46835 fouriersw 46836 goldrapos 47508 |
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