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| Mirrors > Home > ILE Home > Th. List > addlelt | 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 9944 | . . . 4 ⊢ (𝐴 ∈ ℝ+ → 0 < 𝐴) | |
| 2 | 1 | 3ad2ant3 1047 | . . 3 ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → 0 < 𝐴) |
| 3 | rpre 9939 | . . . . 5 ⊢ (𝐴 ∈ ℝ+ → 𝐴 ∈ ℝ) | |
| 4 | 3 | 3ad2ant3 1047 | . . . 4 ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → 𝐴 ∈ ℝ) |
| 5 | simp1 1024 | . . . 4 ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → 𝑀 ∈ ℝ) | |
| 6 | 4, 5 | ltaddposd 8751 | . . 3 ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → (0 < 𝐴 ↔ 𝑀 < (𝑀 + 𝐴))) |
| 7 | 2, 6 | mpbid 147 | . 2 ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → 𝑀 < (𝑀 + 𝐴)) |
| 8 | simpl 109 | . . . . 5 ⊢ ((𝑀 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → 𝑀 ∈ ℝ) | |
| 9 | 3 | adantl 277 | . . . . 5 ⊢ ((𝑀 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → 𝐴 ∈ ℝ) |
| 10 | 8, 9 | readdcld 8251 | . . . 4 ⊢ ((𝑀 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → (𝑀 + 𝐴) ∈ ℝ) |
| 11 | 10 | 3adant2 1043 | . . 3 ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → (𝑀 + 𝐴) ∈ ℝ) |
| 12 | simp2 1025 | . . 3 ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → 𝑁 ∈ ℝ) | |
| 13 | ltletr 8311 | . . 3 ⊢ ((𝑀 ∈ ℝ ∧ (𝑀 + 𝐴) ∈ ℝ ∧ 𝑁 ∈ ℝ) → ((𝑀 < (𝑀 + 𝐴) ∧ (𝑀 + 𝐴) ≤ 𝑁) → 𝑀 < 𝑁)) | |
| 14 | 5, 11, 12, 13 | syl3anc 1274 | . 2 ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → ((𝑀 < (𝑀 + 𝐴) ∧ (𝑀 + 𝐴) ≤ 𝑁) → 𝑀 < 𝑁)) |
| 15 | 7, 14 | mpand 429 | 1 ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ ∧ 𝐴 ∈ ℝ+) → ((𝑀 + 𝐴) ≤ 𝑁 → 𝑀 < 𝑁)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ∧ w3a 1005 ∈ wcel 2202 class class class wbr 4093 (class class class)co 6028 ℝcr 8074 0cc0 8075 + caddc 8078 < clt 8256 ≤ cle 8257 ℝ+crp 9932 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2204 ax-14 2205 ax-ext 2213 ax-sep 4212 ax-pow 4270 ax-pr 4305 ax-un 4536 ax-setind 4641 ax-cnex 8166 ax-resscn 8167 ax-1cn 8168 ax-1re 8169 ax-icn 8170 ax-addcl 8171 ax-addrcl 8172 ax-mulcl 8173 ax-addcom 8175 ax-addass 8177 ax-i2m1 8180 ax-0id 8183 ax-rnegex 8184 ax-pre-ltwlin 8188 ax-pre-ltadd 8191 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-ne 2404 df-nel 2499 df-ral 2516 df-rex 2517 df-rab 2520 df-v 2805 df-dif 3203 df-un 3205 df-in 3207 df-ss 3214 df-pw 3658 df-sn 3679 df-pr 3680 df-op 3682 df-uni 3899 df-br 4094 df-opab 4156 df-xp 4737 df-cnv 4739 df-iota 5293 df-fv 5341 df-ov 6031 df-pnf 8258 df-mnf 8259 df-xr 8260 df-ltxr 8261 df-le 8262 df-rp 9933 |
| This theorem is referenced by: zltaddlt1le 10287 |
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