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| Mirrors > Home > MPE Home > Th. List > lesub3d | Structured version Visualization version GIF version | ||
| Description: The result of subtracting a number less than or equal to an intermediate number from a number greater than or equal to a third number increased by the intermediate number is greater than or equal to the third number. (Contributed by AV, 13-Aug-2020.) |
| Ref | Expression |
|---|---|
| leidd.1 | ⊢ (𝜑 → 𝐴 ∈ ℝ) |
| ltnegd.2 | ⊢ (𝜑 → 𝐵 ∈ ℝ) |
| ltadd1d.3 | ⊢ (𝜑 → 𝐶 ∈ ℝ) |
| lesub3d.x | ⊢ (𝜑 → 𝑋 ∈ ℝ) |
| lesub3d.g | ⊢ (𝜑 → (𝑋 + 𝐶) ≤ 𝐴) |
| lesub3d.l | ⊢ (𝜑 → 𝐵 ≤ 𝑋) |
| Ref | Expression |
|---|---|
| lesub3d | ⊢ (𝜑 → 𝐶 ≤ (𝐴 − 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ltadd1d.3 | . . . 4 ⊢ (𝜑 → 𝐶 ∈ ℝ) | |
| 2 | ltnegd.2 | . . . 4 ⊢ (𝜑 → 𝐵 ∈ ℝ) | |
| 3 | 1, 2 | readdcld 11290 | . . 3 ⊢ (𝜑 → (𝐶 + 𝐵) ∈ ℝ) |
| 4 | lesub3d.x | . . . 4 ⊢ (𝜑 → 𝑋 ∈ ℝ) | |
| 5 | 4, 1 | readdcld 11290 | . . 3 ⊢ (𝜑 → (𝑋 + 𝐶) ∈ ℝ) |
| 6 | leidd.1 | . . 3 ⊢ (𝜑 → 𝐴 ∈ ℝ) | |
| 7 | 1 | recnd 11289 | . . . . 5 ⊢ (𝜑 → 𝐶 ∈ ℂ) |
| 8 | 2 | recnd 11289 | . . . . 5 ⊢ (𝜑 → 𝐵 ∈ ℂ) |
| 9 | 7, 8 | addcomd 11463 | . . . 4 ⊢ (𝜑 → (𝐶 + 𝐵) = (𝐵 + 𝐶)) |
| 10 | lesub3d.l | . . . . 5 ⊢ (𝜑 → 𝐵 ≤ 𝑋) | |
| 11 | 2, 4, 1, 10 | leadd1dd 11877 | . . . 4 ⊢ (𝜑 → (𝐵 + 𝐶) ≤ (𝑋 + 𝐶)) |
| 12 | 9, 11 | eqbrtrd 5165 | . . 3 ⊢ (𝜑 → (𝐶 + 𝐵) ≤ (𝑋 + 𝐶)) |
| 13 | lesub3d.g | . . 3 ⊢ (𝜑 → (𝑋 + 𝐶) ≤ 𝐴) | |
| 14 | 3, 5, 6, 12, 13 | letrd 11418 | . 2 ⊢ (𝜑 → (𝐶 + 𝐵) ≤ 𝐴) |
| 15 | leaddsub 11739 | . . 3 ⊢ ((𝐶 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐴 ∈ ℝ) → ((𝐶 + 𝐵) ≤ 𝐴 ↔ 𝐶 ≤ (𝐴 − 𝐵))) | |
| 16 | 1, 2, 6, 15 | syl3anc 1373 | . 2 ⊢ (𝜑 → ((𝐶 + 𝐵) ≤ 𝐴 ↔ 𝐶 ≤ (𝐴 − 𝐵))) |
| 17 | 14, 16 | mpbid 232 | 1 ⊢ (𝜑 → 𝐶 ≤ (𝐴 − 𝐵)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∈ wcel 2108 class class class wbr 5143 (class class class)co 7431 ℝcr 11154 + caddc 11158 ≤ cle 11296 − cmin 11492 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2708 ax-sep 5296 ax-nul 5306 ax-pow 5365 ax-pr 5432 ax-un 7755 ax-resscn 11212 ax-1cn 11213 ax-icn 11214 ax-addcl 11215 ax-addrcl 11216 ax-mulcl 11217 ax-mulrcl 11218 ax-mulcom 11219 ax-addass 11220 ax-mulass 11221 ax-distr 11222 ax-i2m1 11223 ax-1ne0 11224 ax-1rid 11225 ax-rnegex 11226 ax-rrecex 11227 ax-cnre 11228 ax-pre-lttri 11229 ax-pre-lttrn 11230 ax-pre-ltadd 11231 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2065 df-mo 2540 df-eu 2569 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2892 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-reu 3381 df-rab 3437 df-v 3482 df-sbc 3789 df-csb 3900 df-dif 3954 df-un 3956 df-in 3958 df-ss 3968 df-nul 4334 df-if 4526 df-pw 4602 df-sn 4627 df-pr 4629 df-op 4633 df-uni 4908 df-br 5144 df-opab 5206 df-mpt 5226 df-id 5578 df-po 5592 df-so 5593 df-xp 5691 df-rel 5692 df-cnv 5693 df-co 5694 df-dm 5695 df-rn 5696 df-res 5697 df-ima 5698 df-iota 6514 df-fun 6563 df-fn 6564 df-f 6565 df-f1 6566 df-fo 6567 df-f1o 6568 df-fv 6569 df-riota 7388 df-ov 7434 df-oprab 7435 df-mpo 7436 df-er 8745 df-en 8986 df-dom 8987 df-sdom 8988 df-pnf 11297 df-mnf 11298 df-xr 11299 df-ltxr 11300 df-le 11301 df-sub 11494 df-neg 11495 |
| This theorem is referenced by: prmgaplem8 17096 bcmono 27321 fltnlta 42673 |
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