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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 11238 | . . 3 ⊢ (𝜑 → (𝐶 + 𝐵) ∈ ℝ) |
| 4 | lesub3d.x | . . . 4 ⊢ (𝜑 → 𝑋 ∈ ℝ) | |
| 5 | 4, 1 | readdcld 11238 | . . 3 ⊢ (𝜑 → (𝑋 + 𝐶) ∈ ℝ) |
| 6 | leidd.1 | . . 3 ⊢ (𝜑 → 𝐴 ∈ ℝ) | |
| 7 | 1 | recnd 11237 | . . . . 5 ⊢ (𝜑 → 𝐶 ∈ ℂ) |
| 8 | 2 | recnd 11237 | . . . . 5 ⊢ (𝜑 → 𝐵 ∈ ℂ) |
| 9 | 7, 8 | addcomd 11412 | . . . 4 ⊢ (𝜑 → (𝐶 + 𝐵) = (𝐵 + 𝐶)) |
| 10 | lesub3d.l | . . . . 5 ⊢ (𝜑 → 𝐵 ≤ 𝑋) | |
| 11 | 2, 4, 1, 10 | leadd1dd 11828 | . . . 4 ⊢ (𝜑 → (𝐵 + 𝐶) ≤ (𝑋 + 𝐶)) |
| 12 | 9, 11 | eqbrtrd 5137 | . . 3 ⊢ (𝜑 → (𝐶 + 𝐵) ≤ (𝑋 + 𝐶)) |
| 13 | lesub3d.g | . . 3 ⊢ (𝜑 → (𝑋 + 𝐶) ≤ 𝐴) | |
| 14 | 3, 5, 6, 12, 13 | letrd 11367 | . 2 ⊢ (𝜑 → (𝐶 + 𝐵) ≤ 𝐴) |
| 15 | leaddsub 11690 | . . 3 ⊢ ((𝐶 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐴 ∈ ℝ) → ((𝐶 + 𝐵) ≤ 𝐴 ↔ 𝐶 ≤ (𝐴 − 𝐵))) | |
| 16 | 1, 2, 6, 15 | syl3anc 1396 | . 2 ⊢ (𝜑 → ((𝐶 + 𝐵) ≤ 𝐴 ↔ 𝐶 ≤ (𝐴 − 𝐵))) |
| 17 | 14, 16 | mpbid 235 | 1 ⊢ (𝜑 → 𝐶 ≤ (𝐴 − 𝐵)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 209 ∈ wcel 2149 class class class wbr 5113 (class class class)co 7411 ℝcr 11099 + caddc 11103 ≤ cle 11244 − cmin 11441 |
| 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 11157 ax-1cn 11158 ax-icn 11159 ax-addcl 11160 ax-addrcl 11161 ax-mulcl 11162 ax-mulrcl 11163 ax-mulcom 11164 ax-addass 11165 ax-mulass 11166 ax-distr 11167 ax-i2m1 11168 ax-1ne0 11169 ax-1rid 11170 ax-rnegex 11171 ax-rrecex 11172 ax-cnre 11173 ax-pre-lttri 11174 ax-pre-lttrn 11175 ax-pre-ltadd 11176 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 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-reu 3377 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-po 5570 df-so 5571 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-riota 7368 df-ov 7414 df-oprab 7415 df-mpo 7416 df-er 8694 df-en 8944 df-dom 8945 df-sdom 8946 df-pnf 11245 df-mnf 11246 df-xr 11247 df-ltxr 11248 df-le 11249 df-sub 11443 df-neg 11444 |
| This theorem is referenced by: prmgaplem8 17118 bcmono 27407 fltnlta 43287 |
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