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| Mirrors > Home > MPE Home > Th. List > addlelt | Structured version Visualization version GIF version | ||
| Description: If the sum of a real number and a positive real number is less than or equal to a third real number, the first real number is less than the third real number. (Contributed by AV, 1-Jul-2021.) |
| Ref | Expression |
|---|---|
| addlelt | ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → ((𝑀 + 𝐴) ≤ 𝑁 → 𝑀 < 𝑁)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | rpgt0 12909 | . . . 4 ⊢ (𝐴 ∈ ℝ+ → 0 < 𝐴) | |
| 2 | 1 | 3ad2ant3 1135 | . . 3 ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → 0 < 𝐴) |
| 3 | rpre 12905 | . . . . 5 ⊢ (𝐴 ∈ ℝ+ → 𝐴 ∈ ℝ) | |
| 4 | 3 | 3ad2ant3 1135 | . . . 4 ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → 𝐴 ∈ ℝ) |
| 5 | simp1 1136 | . . . 4 ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → 𝑀 ∈ ℝ) | |
| 6 | 4, 5 | ltaddposd 11707 | . . 3 ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → (0 < 𝐴 ↔ 𝑀 < (𝑀 + 𝐴))) |
| 7 | 2, 6 | mpbid 232 | . 2 ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → 𝑀 < (𝑀 + 𝐴)) |
| 8 | simpl 482 | . . . . 5 ⊢ ((𝑀 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → 𝑀 ∈ ℝ) | |
| 9 | 3 | adantl 481 | . . . . 5 ⊢ ((𝑀 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → 𝐴 ∈ ℝ) |
| 10 | 8, 9 | readdcld 11147 | . . . 4 ⊢ ((𝑀 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → (𝑀 + 𝐴) ∈ ℝ) |
| 11 | 10 | 3adant2 1131 | . . 3 ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → (𝑀 + 𝐴) ∈ ℝ) |
| 12 | simp2 1137 | . . 3 ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → 𝑁 ∈ ℝ) | |
| 13 | ltletr 11211 | . . 3 ⊢ ((𝑀 ∈ ℝ ∧ (𝑀 + 𝐴) ∈ ℝ ∧ 𝑁 ∈ ℝ) → ((𝑀 < (𝑀 + 𝐴) ∧ (𝑀 + 𝐴) ≤ 𝑁) → 𝑀 < 𝑁)) | |
| 14 | 5, 11, 12, 13 | syl3anc 1373 | . 2 ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → ((𝑀 < (𝑀 + 𝐴) ∧ (𝑀 + 𝐴) ≤ 𝑁) → 𝑀 < 𝑁)) |
| 15 | 7, 14 | mpand 695 | 1 ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → ((𝑀 + 𝐴) ≤ 𝑁 → 𝑀 < 𝑁)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∧ w3a 1086 ∈ wcel 2111 class class class wbr 5093 (class class class)co 7352 ℝcr 11011 0cc0 11012 + caddc 11015 < clt 11152 ≤ cle 11153 ℝ+crp 12896 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-sep 5236 ax-nul 5246 ax-pow 5305 ax-pr 5372 ax-un 7674 ax-resscn 11069 ax-1cn 11070 ax-icn 11071 ax-addcl 11072 ax-addrcl 11073 ax-mulcl 11074 ax-mulrcl 11075 ax-mulcom 11076 ax-addass 11077 ax-mulass 11078 ax-distr 11079 ax-i2m1 11080 ax-1ne0 11081 ax-1rid 11082 ax-rnegex 11083 ax-rrecex 11084 ax-cnre 11085 ax-pre-lttri 11086 ax-pre-lttrn 11087 ax-pre-ltadd 11088 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-nel 3033 df-ral 3048 df-rex 3057 df-rab 3396 df-v 3438 df-sbc 3737 df-csb 3846 df-dif 3900 df-un 3902 df-in 3904 df-ss 3914 df-nul 4283 df-if 4475 df-pw 4551 df-sn 4576 df-pr 4578 df-op 4582 df-uni 4859 df-br 5094 df-opab 5156 df-mpt 5175 df-id 5514 df-po 5527 df-so 5528 df-xp 5625 df-rel 5626 df-cnv 5627 df-co 5628 df-dm 5629 df-rn 5630 df-res 5631 df-ima 5632 df-iota 6443 df-fun 6489 df-fn 6490 df-f 6491 df-f1 6492 df-fo 6493 df-f1o 6494 df-fv 6495 df-ov 7355 df-er 8628 df-en 8876 df-dom 8877 df-sdom 8878 df-pnf 11154 df-mnf 11155 df-xr 11156 df-ltxr 11157 df-le 11158 df-rp 12897 |
| This theorem is referenced by: zltaddlt1le 13411 |
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