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Mirrors > Home > MPE Home > Th. List > le2add | Structured version Visualization version GIF version |
Description: Adding both sides of two 'less than or equal to' relations. (Contributed by NM, 17-Apr-2005.) (Proof shortened by Mario Carneiro, 27-May-2016.) |
Ref | Expression |
---|---|
le2add | ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ (𝐶 ∈ ℝ ∧ 𝐷 ∈ ℝ)) → ((𝐴 ≤ 𝐶 ∧ 𝐵 ≤ 𝐷) → (𝐴 + 𝐵) ≤ (𝐶 + 𝐷))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpll 807 | . . . 4 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ (𝐶 ∈ ℝ ∧ 𝐷 ∈ ℝ)) → 𝐴 ∈ ℝ) | |
2 | simprl 811 | . . . 4 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ (𝐶 ∈ ℝ ∧ 𝐷 ∈ ℝ)) → 𝐶 ∈ ℝ) | |
3 | simplr 809 | . . . 4 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ (𝐶 ∈ ℝ ∧ 𝐷 ∈ ℝ)) → 𝐵 ∈ ℝ) | |
4 | leadd1 10684 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 𝐶 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 ≤ 𝐶 ↔ (𝐴 + 𝐵) ≤ (𝐶 + 𝐵))) | |
5 | 1, 2, 3, 4 | syl3anc 1477 | . . 3 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ (𝐶 ∈ ℝ ∧ 𝐷 ∈ ℝ)) → (𝐴 ≤ 𝐶 ↔ (𝐴 + 𝐵) ≤ (𝐶 + 𝐵))) |
6 | simprr 813 | . . . 4 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ (𝐶 ∈ ℝ ∧ 𝐷 ∈ ℝ)) → 𝐷 ∈ ℝ) | |
7 | leadd2 10685 | . . . 4 ⊢ ((𝐵 ∈ ℝ ∧ 𝐷 ∈ ℝ ∧ 𝐶 ∈ ℝ) → (𝐵 ≤ 𝐷 ↔ (𝐶 + 𝐵) ≤ (𝐶 + 𝐷))) | |
8 | 3, 6, 2, 7 | syl3anc 1477 | . . 3 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ (𝐶 ∈ ℝ ∧ 𝐷 ∈ ℝ)) → (𝐵 ≤ 𝐷 ↔ (𝐶 + 𝐵) ≤ (𝐶 + 𝐷))) |
9 | 5, 8 | anbi12d 749 | . 2 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ (𝐶 ∈ ℝ ∧ 𝐷 ∈ ℝ)) → ((𝐴 ≤ 𝐶 ∧ 𝐵 ≤ 𝐷) ↔ ((𝐴 + 𝐵) ≤ (𝐶 + 𝐵) ∧ (𝐶 + 𝐵) ≤ (𝐶 + 𝐷)))) |
10 | 1, 3 | readdcld 10257 | . . 3 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ (𝐶 ∈ ℝ ∧ 𝐷 ∈ ℝ)) → (𝐴 + 𝐵) ∈ ℝ) |
11 | 2, 3 | readdcld 10257 | . . 3 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ (𝐶 ∈ ℝ ∧ 𝐷 ∈ ℝ)) → (𝐶 + 𝐵) ∈ ℝ) |
12 | 2, 6 | readdcld 10257 | . . 3 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ (𝐶 ∈ ℝ ∧ 𝐷 ∈ ℝ)) → (𝐶 + 𝐷) ∈ ℝ) |
13 | letr 10319 | . . 3 ⊢ (((𝐴 + 𝐵) ∈ ℝ ∧ (𝐶 + 𝐵) ∈ ℝ ∧ (𝐶 + 𝐷) ∈ ℝ) → (((𝐴 + 𝐵) ≤ (𝐶 + 𝐵) ∧ (𝐶 + 𝐵) ≤ (𝐶 + 𝐷)) → (𝐴 + 𝐵) ≤ (𝐶 + 𝐷))) | |
14 | 10, 11, 12, 13 | syl3anc 1477 | . 2 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ (𝐶 ∈ ℝ ∧ 𝐷 ∈ ℝ)) → (((𝐴 + 𝐵) ≤ (𝐶 + 𝐵) ∧ (𝐶 + 𝐵) ≤ (𝐶 + 𝐷)) → (𝐴 + 𝐵) ≤ (𝐶 + 𝐷))) |
15 | 9, 14 | sylbid 230 | 1 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ (𝐶 ∈ ℝ ∧ 𝐷 ∈ ℝ)) → ((𝐴 ≤ 𝐶 ∧ 𝐵 ≤ 𝐷) → (𝐴 + 𝐵) ≤ (𝐶 + 𝐷))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 196 ∧ wa 383 ∈ wcel 2135 class class class wbr 4800 (class class class)co 6809 ℝcr 10123 + caddc 10127 ≤ cle 10263 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1867 ax-4 1882 ax-5 1984 ax-6 2050 ax-7 2086 ax-8 2137 ax-9 2144 ax-10 2164 ax-11 2179 ax-12 2192 ax-13 2387 ax-ext 2736 ax-sep 4929 ax-nul 4937 ax-pow 4988 ax-pr 5051 ax-un 7110 ax-resscn 10181 ax-1cn 10182 ax-icn 10183 ax-addcl 10184 ax-addrcl 10185 ax-mulcl 10186 ax-mulrcl 10187 ax-mulcom 10188 ax-addass 10189 ax-mulass 10190 ax-distr 10191 ax-i2m1 10192 ax-1ne0 10193 ax-1rid 10194 ax-rnegex 10195 ax-rrecex 10196 ax-cnre 10197 ax-pre-lttri 10198 ax-pre-lttrn 10199 ax-pre-ltadd 10200 |
This theorem depends on definitions: df-bi 197 df-or 384 df-an 385 df-3or 1073 df-3an 1074 df-tru 1631 df-ex 1850 df-nf 1855 df-sb 2043 df-eu 2607 df-mo 2608 df-clab 2743 df-cleq 2749 df-clel 2752 df-nfc 2887 df-ne 2929 df-nel 3032 df-ral 3051 df-rex 3052 df-rab 3055 df-v 3338 df-sbc 3573 df-csb 3671 df-dif 3714 df-un 3716 df-in 3718 df-ss 3725 df-nul 4055 df-if 4227 df-pw 4300 df-sn 4318 df-pr 4320 df-op 4324 df-uni 4585 df-br 4801 df-opab 4861 df-mpt 4878 df-id 5170 df-po 5183 df-so 5184 df-xp 5268 df-rel 5269 df-cnv 5270 df-co 5271 df-dm 5272 df-rn 5273 df-res 5274 df-ima 5275 df-iota 6008 df-fun 6047 df-fn 6048 df-f 6049 df-f1 6050 df-fo 6051 df-f1o 6052 df-fv 6053 df-ov 6812 df-er 7907 df-en 8118 df-dom 8119 df-sdom 8120 df-pnf 10264 df-mnf 10265 df-xr 10266 df-ltxr 10267 df-le 10268 |
This theorem is referenced by: addge0 10705 le2addi 10779 le2addd 10834 fzadd2 12565 swrdccatin2 13683 cshwcsh2id 13770 sqrlem7 14184 lo1add 14552 climcndslem1 14776 climcndslem2 14777 mdegmullem 24033 mumullem2 25101 pntrsumbnd2 25451 pntlemf 25489 crctcshwlkn0 26920 ubthlem2 28032 nmoptrii 29258 cdj3i 29605 itg2addnc 33773 jm2.26lem3 38066 gbegt5 42155 gbowgt5 42156 gboge9 42158 |
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