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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 11357 | . 2 ⊢ ((0 < 𝐴 ∧ 0 < 𝐵) → 0 < (𝐴 · 𝐵)) |
| 6 | 1, 2, 5 | mp2an 705 | 1 ⊢ 0 < (𝐴 · 𝐵) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2146 class class class wbr 5111 (class class class)co 7419 ℝcr 11114 0cc0 11115 · cmul 11120 < clt 11258 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2737 ax-sep 5259 ax-nul 5271 ax-pow 5338 ax-pr 5406 ax-un 7742 ax-resscn 11172 ax-1cn 11173 ax-addrcl 11176 ax-mulrcl 11178 ax-rnegex 11186 ax-cnre 11188 ax-pre-mulgt0 11192 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-nel 3067 df-ral 3082 df-rex 3092 df-rab 3419 df-v 3459 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4287 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4875 df-br 5112 df-opab 5176 df-mpt 5195 df-id 5558 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-iota 6496 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-er 8700 df-en 8950 df-dom 8951 df-sdom 8952 df-pnf 11260 df-mnf 11261 df-ltxr 11263 |
| This theorem is used by: ef01bndlem 16262 efif1olem2 26759 efif1olem4 26761 ang180lem1 27025 ang180lem2 27026 chebbnd1lem3 27686 chebbnd1 27687 sinaover2ne0 46640 dirkercncflem4 46878 fourierdlem24 46903 fourierswlem 47002 fouriersw 47003 goldrapos 47678 |
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