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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 11265 | . . 3 ⊢ (𝜑 → (𝐶 + 𝐵) ∈ ℝ) |
| 4 | lesub3d.x | . . . 4 ⊢ (𝜑 → 𝑋 ∈ ℝ) | |
| 5 | 4, 1 | readdcld 11265 | . . 3 ⊢ (𝜑 → (𝑋 + 𝐶) ∈ ℝ) |
| 6 | leidd.1 | . . 3 ⊢ (𝜑 → 𝐴 ∈ ℝ) | |
| 7 | 1 | recnd 11264 | . . . . 5 ⊢ (𝜑 → 𝐶 ∈ ℂ) |
| 8 | 2 | recnd 11264 | . . . . 5 ⊢ (𝜑 → 𝐵 ∈ ℂ) |
| 9 | 7, 8 | addcomd 11439 | . . . 4 ⊢ (𝜑 → (𝐶 + 𝐵) = (𝐵 + 𝐶)) |
| 10 | lesub3d.l | . . . . 5 ⊢ (𝜑 → 𝐵 ≤ 𝑋) | |
| 11 | 2, 4, 1, 10 | leadd1dd 11855 | . . . 4 ⊢ (𝜑 → (𝐵 + 𝐶) ≤ (𝑋 + 𝐶)) |
| 12 | 9, 11 | eqbrtrd 5127 | . . 3 ⊢ (𝜑 → (𝐶 + 𝐵) ≤ (𝑋 + 𝐶)) |
| 13 | lesub3d.g | . . 3 ⊢ (𝜑 → (𝑋 + 𝐶) ≤ 𝐴) | |
| 14 | 3, 5, 6, 12, 13 | letrd 11394 | . 2 ⊢ (𝜑 → (𝐶 + 𝐵) ≤ 𝐴) |
| 15 | leaddsub 11717 | . . 3 ⊢ ((𝐶 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐴 ∈ ℝ) → ((𝐶 + 𝐵) ≤ 𝐴 ↔ 𝐶 ≤ (𝐴 − 𝐵))) | |
| 16 | 1, 2, 6, 15 | syl3anc 1398 | . 2 ⊢ (𝜑 → ((𝐶 + 𝐵) ≤ 𝐴 ↔ 𝐶 ≤ (𝐴 − 𝐵))) |
| 17 | 14, 16 | mpbid 235 | 1 ⊢ (𝜑 → 𝐶 ≤ (𝐴 − 𝐵)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∈ wcel 2145 class class class wbr 5103 (class class class)co 7414 ℝcr 11126 + caddc 11130 ≤ cle 11271 − cmin 11468 |
| 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 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-sep 5251 ax-nul 5263 ax-pow 5330 ax-pr 5398 ax-un 7737 ax-resscn 11184 ax-1cn 11185 ax-icn 11186 ax-addcl 11187 ax-addrcl 11188 ax-mulcl 11189 ax-mulrcl 11190 ax-mulcom 11191 ax-addass 11192 ax-mulass 11193 ax-distr 11194 ax-i2m1 11195 ax-1ne0 11196 ax-1rid 11197 ax-rnegex 11198 ax-rrecex 11199 ax-cnre 11200 ax-pre-lttri 11201 ax-pre-lttrn 11202 ax-pre-ltadd 11203 |
| 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 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5104 df-opab 5168 df-mpt 5187 df-id 5550 df-po 5563 df-so 5564 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-iota 6489 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-riota 7371 df-ov 7417 df-oprab 7418 df-mpo 7419 df-er 8699 df-en 8956 df-dom 8957 df-sdom 8958 df-pnf 11272 df-mnf 11273 df-xr 11274 df-ltxr 11275 df-le 11276 df-sub 11470 df-neg 11471 |
| This theorem is used by: prmgaplem8 17153 bcmono 27516 fltnlta 43512 |
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