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| Mirrors > Home > ILE Home > Th. List > lediv12ad | GIF version | ||
| Description: Comparison of ratio of two nonnegative numbers. (Contributed by Mario Carneiro, 28-May-2016.) |
| Ref | Expression |
|---|---|
| ltmul1d.1 | ⊢ (𝜑 → 𝐴 ∈ ℝ) |
| ltmul1d.2 | ⊢ (𝜑 → 𝐵 ∈ ℝ) |
| ltmul1d.3 | ⊢ (𝜑 → 𝐶 ∈ ℝ+) |
| lediv12ad.4 | ⊢ (𝜑 → 𝐷 ∈ ℝ) |
| lediv12ad.5 | ⊢ (𝜑 → 0 ≤ 𝐴) |
| lediv12ad.6 | ⊢ (𝜑 → 𝐴 ≤ 𝐵) |
| lediv12ad.7 | ⊢ (𝜑 → 𝐶 ≤ 𝐷) |
| Ref | Expression |
|---|---|
| lediv12ad | ⊢ (𝜑 → (𝐴 / 𝐷) ≤ (𝐵 / 𝐶)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ltmul1d.1 | . . 3 ⊢ (𝜑 → 𝐴 ∈ ℝ) | |
| 2 | ltmul1d.2 | . . 3 ⊢ (𝜑 → 𝐵 ∈ ℝ) | |
| 3 | 1, 2 | jca 306 | . 2 ⊢ (𝜑 → (𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ)) |
| 4 | lediv12ad.5 | . . 3 ⊢ (𝜑 → 0 ≤ 𝐴) | |
| 5 | lediv12ad.6 | . . 3 ⊢ (𝜑 → 𝐴 ≤ 𝐵) | |
| 6 | 4, 5 | jca 306 | . 2 ⊢ (𝜑 → (0 ≤ 𝐴 ∧ 𝐴 ≤ 𝐵)) |
| 7 | ltmul1d.3 | . . . 4 ⊢ (𝜑 → 𝐶 ∈ ℝ+) | |
| 8 | 7 | rpred 10115 | . . 3 ⊢ (𝜑 → 𝐶 ∈ ℝ) |
| 9 | lediv12ad.4 | . . 3 ⊢ (𝜑 → 𝐷 ∈ ℝ) | |
| 10 | 8, 9 | jca 306 | . 2 ⊢ (𝜑 → (𝐶 ∈ ℝ ∧ 𝐷 ∈ ℝ)) |
| 11 | 7 | rpgt0d 10118 | . . 3 ⊢ (𝜑 → 0 < 𝐶) |
| 12 | lediv12ad.7 | . . 3 ⊢ (𝜑 → 𝐶 ≤ 𝐷) | |
| 13 | 11, 12 | jca 306 | . 2 ⊢ (𝜑 → (0 < 𝐶 ∧ 𝐶 ≤ 𝐷)) |
| 14 | lediv12a 9233 | . 2 ⊢ ((((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ (0 ≤ 𝐴 ∧ 𝐴 ≤ 𝐵)) ∧ ((𝐶 ∈ ℝ ∧ 𝐷 ∈ ℝ) ∧ (0 < 𝐶 ∧ 𝐶 ≤ 𝐷))) → (𝐴 / 𝐷) ≤ (𝐵 / 𝐶)) | |
| 15 | 3, 6, 10, 13, 14 | syl22anc 1279 | 1 ⊢ (𝜑 → (𝐴 / 𝐷) ≤ (𝐵 / 𝐶)) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 104 ∈ wcel 2209 class class class wbr 4131 (class class class)co 6088 ℝcr 8185 0cc0 8186 < clt 8367 ≤ cle 8368 / cdiv 9011 ℝ+crp 10072 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4251 ax-pow 4313 ax-pr 4348 ax-un 4580 ax-setind 4686 ax-cnex 8277 ax-resscn 8278 ax-1cn 8279 ax-1re 8280 ax-icn 8281 ax-addcl 8282 ax-addrcl 8283 ax-mulcl 8284 ax-mulrcl 8285 ax-addcom 8286 ax-mulcom 8287 ax-addass 8288 ax-mulass 8289 ax-distr 8290 ax-i2m1 8291 ax-0lt1 8292 ax-1rid 8293 ax-0id 8294 ax-rnegex 8295 ax-precex 8296 ax-cnre 8297 ax-pre-ltirr 8298 ax-pre-ltwlin 8299 ax-pre-lttrn 8300 ax-pre-apti 8301 ax-pre-ltadd 8302 ax-pre-mulgt0 8303 ax-pre-mulext 8304 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-reu 2535 df-rmo 2536 df-rab 2537 df-v 2823 df-sbc 3052 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-br 4132 df-opab 4194 df-id 4440 df-po 4443 df-iso 4444 df-xp 4782 df-rel 4783 df-cnv 4784 df-co 4785 df-dm 4786 df-iota 5340 df-fun 5382 df-fv 5388 df-riota 6041 df-ov 6091 df-oprab 6092 df-mpo 6093 df-pnf 8369 df-mnf 8370 df-xr 8371 df-ltxr 8372 df-le 8373 df-sub 8507 df-neg 8508 df-reap 8912 df-ap 8919 df-div 9012 df-rp 10073 |
| This theorem is used by: (None) |
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