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Mirrors > Home > MPE Home > Th. List > ltadd2 | Structured version Visualization version GIF version |
Description: Addition to both sides of 'less than'. (Contributed by NM, 12-Nov-1999.) (Revised by Mario Carneiro, 27-May-2016.) |
Ref | Expression |
---|---|
ltadd2 | ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → (𝐴 < 𝐵 ↔ (𝐶 + 𝐴) < (𝐶 + 𝐵))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | axltadd 10906 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → (𝐴 < 𝐵 → (𝐶 + 𝐴) < (𝐶 + 𝐵))) | |
2 | oveq2 7221 | . . . . . 6 ⊢ (𝐴 = 𝐵 → (𝐶 + 𝐴) = (𝐶 + 𝐵)) | |
3 | 2 | a1i 11 | . . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → (𝐴 = 𝐵 → (𝐶 + 𝐴) = (𝐶 + 𝐵))) |
4 | axltadd 10906 | . . . . . 6 ⊢ ((𝐵 ∈ ℝ ∧ 𝐴 ∈ ℝ ∧ 𝐶 ∈ ℝ) → (𝐵 < 𝐴 → (𝐶 + 𝐵) < (𝐶 + 𝐴))) | |
5 | 4 | 3com12 1125 | . . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → (𝐵 < 𝐴 → (𝐶 + 𝐵) < (𝐶 + 𝐴))) |
6 | 3, 5 | orim12d 965 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → ((𝐴 = 𝐵 ∨ 𝐵 < 𝐴) → ((𝐶 + 𝐴) = (𝐶 + 𝐵) ∨ (𝐶 + 𝐵) < (𝐶 + 𝐴)))) |
7 | 6 | con3d 155 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → (¬ ((𝐶 + 𝐴) = (𝐶 + 𝐵) ∨ (𝐶 + 𝐵) < (𝐶 + 𝐴)) → ¬ (𝐴 = 𝐵 ∨ 𝐵 < 𝐴))) |
8 | simp3 1140 | . . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → 𝐶 ∈ ℝ) | |
9 | simp1 1138 | . . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → 𝐴 ∈ ℝ) | |
10 | 8, 9 | readdcld 10862 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → (𝐶 + 𝐴) ∈ ℝ) |
11 | simp2 1139 | . . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → 𝐵 ∈ ℝ) | |
12 | 8, 11 | readdcld 10862 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → (𝐶 + 𝐵) ∈ ℝ) |
13 | axlttri 10904 | . . . 4 ⊢ (((𝐶 + 𝐴) ∈ ℝ ∧ (𝐶 + 𝐵) ∈ ℝ) → ((𝐶 + 𝐴) < (𝐶 + 𝐵) ↔ ¬ ((𝐶 + 𝐴) = (𝐶 + 𝐵) ∨ (𝐶 + 𝐵) < (𝐶 + 𝐴)))) | |
14 | 10, 12, 13 | syl2anc 587 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → ((𝐶 + 𝐴) < (𝐶 + 𝐵) ↔ ¬ ((𝐶 + 𝐴) = (𝐶 + 𝐵) ∨ (𝐶 + 𝐵) < (𝐶 + 𝐴)))) |
15 | axlttri 10904 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 < 𝐵 ↔ ¬ (𝐴 = 𝐵 ∨ 𝐵 < 𝐴))) | |
16 | 9, 11, 15 | syl2anc 587 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → (𝐴 < 𝐵 ↔ ¬ (𝐴 = 𝐵 ∨ 𝐵 < 𝐴))) |
17 | 7, 14, 16 | 3imtr4d 297 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → ((𝐶 + 𝐴) < (𝐶 + 𝐵) → 𝐴 < 𝐵)) |
18 | 1, 17 | impbid 215 | 1 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → (𝐴 < 𝐵 ↔ (𝐶 + 𝐴) < (𝐶 + 𝐵))) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 209 ∨ wo 847 ∧ w3a 1089 = wceq 1543 ∈ wcel 2110 class class class wbr 5053 (class class class)co 7213 ℝcr 10728 + caddc 10732 < clt 10867 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2016 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2158 ax-12 2175 ax-ext 2708 ax-sep 5192 ax-nul 5199 ax-pow 5258 ax-pr 5322 ax-un 7523 ax-resscn 10786 ax-addrcl 10790 ax-pre-lttri 10803 ax-pre-ltadd 10805 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-nf 1792 df-sb 2071 df-mo 2539 df-eu 2568 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2886 df-ne 2941 df-nel 3047 df-ral 3066 df-rex 3067 df-rab 3070 df-v 3410 df-sbc 3695 df-csb 3812 df-dif 3869 df-un 3871 df-in 3873 df-ss 3883 df-nul 4238 df-if 4440 df-pw 4515 df-sn 4542 df-pr 4544 df-op 4548 df-uni 4820 df-br 5054 df-opab 5116 df-mpt 5136 df-id 5455 df-xp 5557 df-rel 5558 df-cnv 5559 df-co 5560 df-dm 5561 df-rn 5562 df-res 5563 df-ima 5564 df-iota 6338 df-fun 6382 df-fn 6383 df-f 6384 df-f1 6385 df-fo 6386 df-f1o 6387 df-fv 6388 df-ov 7216 df-er 8391 df-en 8627 df-dom 8628 df-sdom 8629 df-pnf 10869 df-mnf 10870 df-ltxr 10872 |
This theorem is referenced by: ltadd2i 10963 ltadd2d 10988 readdcan 11006 ltaddneg 11047 ltadd1 11299 ltaddpos 11322 ltaddsublt 11459 avglt1 12068 flbi2 13392 dp2ltc 30881 sn-ltaddpos 40131 |
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