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| Mirrors > Home > MPE Home > Th. List > Mathboxes > nn0sumltlt | Structured version Visualization version GIF version | ||
| Description: If the sum of two nonnegative integers is less than a third integer, then one of the summands is already less than this third integer. (Contributed by AV, 19-Oct-2019.) |
| Ref | Expression |
|---|---|
| nn0sumltlt | ⊢ ((𝑎 ∈ ℕ0 ∧ 𝑏 ∈ ℕ0 ∧ 𝑐 ∈ ℕ0) → ((𝑎 + 𝑏) < 𝑐 → 𝑏 < 𝑐)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nn0re 12653 | . . 3 ⊢ (𝑎 ∈ ℕ0 → 𝑎 ∈ ℝ) | |
| 2 | nn0re 12653 | . . 3 ⊢ (𝑏 ∈ ℕ0 → 𝑏 ∈ ℝ) | |
| 3 | nn0re 12653 | . . 3 ⊢ (𝑐 ∈ ℕ0 → 𝑐 ∈ ℝ) | |
| 4 | ltaddsub2 11829 | . . 3 ⊢ ((𝑎 ∈ ℝ ∧ 𝑏 ∈ ℝ ∧ 𝑐 ∈ ℝ) → ((𝑎 + 𝑏) < 𝑐 ↔ 𝑏 < (𝑐 − 𝑎))) | |
| 5 | 1, 2, 3, 4 | syl3an 1178 | . 2 ⊢ ((𝑎 ∈ ℕ0 ∧ 𝑏 ∈ ℕ0 ∧ 𝑐 ∈ ℕ0) → ((𝑎 + 𝑏) < 𝑐 ↔ 𝑏 < (𝑐 − 𝑎))) |
| 6 | nn0ge0 12669 | . . . . 5 ⊢ (𝑎 ∈ ℕ0 → 0 ≤ 𝑎) | |
| 7 | 6 | 3ad2ant1 1151 | . . . 4 ⊢ ((𝑎 ∈ ℕ0 ∧ 𝑏 ∈ ℕ0 ∧ 𝑐 ∈ ℕ0) → 0 ≤ 𝑎) |
| 8 | 1, 3 | anim12ci 626 | . . . . . 6 ⊢ ((𝑎 ∈ ℕ0 ∧ 𝑐 ∈ ℕ0) → (𝑐 ∈ ℝ ∧ 𝑎 ∈ ℝ)) |
| 9 | 8 | 3adant2 1149 | . . . . 5 ⊢ ((𝑎 ∈ ℕ0 ∧ 𝑏 ∈ ℕ0 ∧ 𝑐 ∈ ℕ0) → (𝑐 ∈ ℝ ∧ 𝑎 ∈ ℝ)) |
| 10 | subge02 11870 | . . . . . 6 ⊢ ((𝑐 ∈ ℝ ∧ 𝑎 ∈ ℝ) → (0 ≤ 𝑎 ↔ (𝑐 − 𝑎) ≤ 𝑐)) | |
| 11 | 10 | bicomd 226 | . . . . 5 ⊢ ((𝑐 ∈ ℝ ∧ 𝑎 ∈ ℝ) → ((𝑐 − 𝑎) ≤ 𝑐 ↔ 0 ≤ 𝑎)) |
| 12 | 9, 11 | syl 18 | . . . 4 ⊢ ((𝑎 ∈ ℕ0 ∧ 𝑏 ∈ ℕ0 ∧ 𝑐 ∈ ℕ0) → ((𝑐 − 𝑎) ≤ 𝑐 ↔ 0 ≤ 𝑎)) |
| 13 | 7, 12 | mpbird 260 | . . 3 ⊢ ((𝑎 ∈ ℕ0 ∧ 𝑏 ∈ ℕ0 ∧ 𝑐 ∈ ℕ0) → (𝑐 − 𝑎) ≤ 𝑐) |
| 14 | 2 | 3ad2ant2 1152 | . . . 4 ⊢ ((𝑎 ∈ ℕ0 ∧ 𝑏 ∈ ℕ0 ∧ 𝑐 ∈ ℕ0) → 𝑏 ∈ ℝ) |
| 15 | nn0resubcl 48645 | . . . . . 6 ⊢ ((𝑐 ∈ ℕ0 ∧ 𝑎 ∈ ℕ0) → (𝑐 − 𝑎) ∈ ℝ) | |
| 16 | 15 | ancoms 464 | . . . . 5 ⊢ ((𝑎 ∈ ℕ0 ∧ 𝑐 ∈ ℕ0) → (𝑐 − 𝑎) ∈ ℝ) |
| 17 | 16 | 3adant2 1149 | . . . 4 ⊢ ((𝑎 ∈ ℕ0 ∧ 𝑏 ∈ ℕ0 ∧ 𝑐 ∈ ℕ0) → (𝑐 − 𝑎) ∈ ℝ) |
| 18 | 3 | 3ad2ant3 1153 | . . . 4 ⊢ ((𝑎 ∈ ℕ0 ∧ 𝑏 ∈ ℕ0 ∧ 𝑐 ∈ ℕ0) → 𝑐 ∈ ℝ) |
| 19 | ltletr 11439 | . . . 4 ⊢ ((𝑏 ∈ ℝ ∧ (𝑐 − 𝑎) ∈ ℝ ∧ 𝑐 ∈ ℝ) → ((𝑏 < (𝑐 − 𝑎) ∧ (𝑐 − 𝑎) ≤ 𝑐) → 𝑏 < 𝑐)) | |
| 20 | 14, 17, 18, 19 | syl3anc 1399 | . . 3 ⊢ ((𝑎 ∈ ℕ0 ∧ 𝑏 ∈ ℕ0 ∧ 𝑐 ∈ ℕ0) → ((𝑏 < (𝑐 − 𝑎) ∧ (𝑐 − 𝑎) ≤ 𝑐) → 𝑏 < 𝑐)) |
| 21 | 13, 20 | mpan2d 707 | . 2 ⊢ ((𝑎 ∈ ℕ0 ∧ 𝑏 ∈ ℕ0 ∧ 𝑐 ∈ ℕ0) → (𝑏 < (𝑐 − 𝑎) → 𝑏 < 𝑐)) |
| 22 | 5, 21 | sylbid 243 | 1 ⊢ ((𝑎 ∈ ℕ0 ∧ 𝑏 ∈ ℕ0 ∧ 𝑐 ∈ ℕ0) → ((𝑎 + 𝑏) < 𝑐 → 𝑏 < 𝑐)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 ∧ w3a 1103 ∈ wcel 2147 class class class wbr 5106 (class class class)co 7449 ℝcr 11236 0cc0 11237 + caddc 11240 < clt 11380 ≤ cle 11381 − cmin 11578 ℕ0cn0 12644 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5253 ax-nul 5264 ax-pow 5332 ax-pr 5396 ax-un 7781 ax-resscn 11294 ax-1cn 11295 ax-icn 11296 ax-addcl 11297 ax-addrcl 11298 ax-mulcl 11299 ax-mulrcl 11300 ax-mulcom 11301 ax-addass 11302 ax-mulass 11303 ax-distr 11304 ax-i2m1 11305 ax-1ne0 11306 ax-1rid 11307 ax-rnegex 11308 ax-rrecex 11309 ax-cnre 11310 ax-pre-lttri 11311 ax-pre-lttrn 11312 ax-pre-ltadd 11313 ax-pre-mulgt0 11314 |
| 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 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3066 df-ral 3081 df-rex 3091 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4839 df-uni 4871 df-iun 4956 df-br 5107 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5551 df-eprel 5556 df-po 5564 df-so 5565 df-fr 5609 df-we 5611 df-xp 5662 df-rel 5663 df-cnv 5664 df-co 5665 df-dm 5666 df-rn 5667 df-res 5668 df-ima 5669 df-pred 6328 df-ord 6389 df-on 6390 df-lim 6391 df-suc 6392 df-iota 6518 df-fun 6566 df-fn 6567 df-f 6568 df-f1 6569 df-fo 6570 df-f1o 6571 df-fv 6572 df-riota 7406 df-ov 7452 df-oprab 7453 df-mpo 7454 df-om 7910 df-2nd 8034 df-frecs 8335 df-wrecs 8366 df-recs 8415 df-rdg 8454 df-er 8753 df-en 9010 df-dom 9011 df-sdom 9012 df-pnf 11382 df-mnf 11383 df-xr 11384 df-ltxr 11385 df-le 11386 df-sub 11580 df-neg 11581 df-nn 12374 df-n0 12645 |
| This theorem is used by: ply1mulgsumlem1 49823 |
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