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| Mirrors > Home > MPE Home > Th. List > divgt0ii | Structured version Visualization version GIF version | ||
| Description: The ratio of two positive numbers is positive. (Contributed by NM, 18-May-1999.) |
| Ref | Expression |
|---|---|
| ltplus1.1 | ⊢ 𝐴 ∈ ℝ |
| prodgt0.2 | ⊢ 𝐵 ∈ ℝ |
| ltreci.3 | ⊢ 0 < 𝐴 |
| ltreci.4 | ⊢ 0 < 𝐵 |
| Ref | Expression |
|---|---|
| divgt0ii | ⊢ 0 < (𝐴 / 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ltreci.3 | . 2 ⊢ 0 < 𝐴 | |
| 2 | ltplus1.1 | . . 3 ⊢ 𝐴 ∈ ℝ | |
| 3 | prodgt0.2 | . . 3 ⊢ 𝐵 ∈ ℝ | |
| 4 | ltreci.4 | . . 3 ⊢ 0 < 𝐵 | |
| 5 | 2, 3, 4 | divgt0i2i 12140 | . 2 ⊢ (0 < 𝐴 → 0 < (𝐴 / 𝐵)) |
| 6 | 1, 5 | ax-mp 5 | 1 ⊢ 0 < (𝐴 / 𝐵) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2146 class class class wbr 5112 (class class class)co 7416 ℝcr 11109 0cc0 11110 < clt 11253 / cdiv 11881 |
| 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 2738 ax-sep 5260 ax-nul 5272 ax-pow 5339 ax-pr 5407 ax-un 7738 ax-resscn 11167 ax-1cn 11168 ax-icn 11169 ax-addcl 11170 ax-addrcl 11171 ax-mulcl 11172 ax-mulrcl 11173 ax-mulcom 11174 ax-addass 11175 ax-mulass 11176 ax-distr 11177 ax-i2m1 11178 ax-1ne0 11179 ax-1rid 11180 ax-rnegex 11181 ax-rrecex 11182 ax-cnre 11183 ax-pre-lttri 11184 ax-pre-lttrn 11185 ax-pre-ltadd 11186 ax-pre-mulgt0 11187 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2570 df-eu 2600 df-clab 2745 df-cleq 2758 df-clel 2841 df-nfc 2915 df-ne 2962 df-nel 3068 df-ral 3083 df-rex 3093 df-rmo 3372 df-reu 3373 df-rab 3420 df-v 3460 df-sbc 3748 df-csb 3857 df-dif 3911 df-un 3913 df-in 3915 df-ss 3925 df-nul 4290 df-if 4491 df-pw 4567 df-sn 4593 df-pr 4595 df-op 4599 df-uni 4876 df-br 5113 df-opab 5177 df-mpt 5196 df-id 5559 df-po 5572 df-so 5573 df-xp 5670 df-rel 5671 df-cnv 5672 df-co 5673 df-dm 5674 df-rn 5675 df-res 5676 df-ima 5677 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-riota 7373 df-ov 7419 df-oprab 7420 df-mpo 7421 df-er 8696 df-en 8946 df-dom 8947 df-sdom 8948 df-pnf 11255 df-mnf 11256 df-xr 11257 df-ltxr 11258 df-le 11259 df-sub 11453 df-neg 11454 df-div 11882 |
| This theorem is used by: 0.999... 15946 sinhalfpilem 26643 sincos4thpi 26693 sincos6thpi 26696 tanord1 26717 ppiub 27383 chebbnd1 27651 asin1half 43150 acos1half 43151 fourierdlem103 46955 fourierdlem104 46956 goldrapos 47652 |
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