| Mathbox for Alexander van der Vekens |
< Previous
Next >
Nearby theorems |
||
| 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 12537 | . . 3 ⊢ (𝑎 ∈ ℕ0 → 𝑎 ∈ ℝ) | |
| 2 | nn0re 12537 | . . 3 ⊢ (𝑏 ∈ ℕ0 → 𝑏 ∈ ℝ) | |
| 3 | nn0re 12537 | . . 3 ⊢ (𝑐 ∈ ℕ0 → 𝑐 ∈ ℝ) | |
| 4 | ltaddsub2 11713 | . . 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 12553 | . . . . 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 11754 | . . . . . 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 48196 | . . . . . 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 11326 | . . . 4 ⊢ ((𝑏 ∈ ℝ ∧ (𝑐 − 𝑎) ∈ ℝ ∧ 𝑐 ∈ ℝ) → ((𝑏 < (𝑐 − 𝑎) ∧ (𝑐 − 𝑎) ≤ 𝑐) → 𝑏 < 𝑐)) | |
| 20 | 14, 17, 18, 19 | syl3anc 1398 | . . 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 2145 class class class wbr 5103 (class class class)co 7413 ℝcr 11123 0cc0 11124 + caddc 11127 < clt 11267 ≤ cle 11268 − cmin 11465 ℕ0cn0 12528 |
| 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 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-sep 5251 ax-nul 5263 ax-pow 5330 ax-pr 5398 ax-un 7736 ax-resscn 11181 ax-1cn 11182 ax-icn 11183 ax-addcl 11184 ax-addrcl 11185 ax-mulcl 11186 ax-mulrcl 11187 ax-mulcom 11188 ax-addass 11189 ax-mulass 11190 ax-distr 11191 ax-i2m1 11192 ax-1ne0 11193 ax-1rid 11194 ax-rnegex 11195 ax-rrecex 11196 ax-cnre 11197 ax-pre-lttri 11198 ax-pre-lttrn 11199 ax-pre-ltadd 11200 ax-pre-mulgt0 11201 |
| 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 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5550 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-we 5610 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-pred 6299 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6489 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-riota 7370 df-ov 7416 df-oprab 7417 df-mpo 7418 df-om 7863 df-2nd 7987 df-frecs 8280 df-wrecs 8311 df-recs 8360 df-rdg 8399 df-er 8696 df-en 8953 df-dom 8954 df-sdom 8955 df-pnf 11269 df-mnf 11270 df-xr 11271 df-ltxr 11272 df-le 11273 df-sub 11467 df-neg 11468 df-nn 12258 df-n0 12529 |
| This theorem is used by: ply1mulgsumlem1 49316 |
| Copyright terms: Public domain | W3C validator |