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| Mirrors > Home > MPE Home > Th. List > Mathboxes > nnsum4primesle9 | Structured version Visualization version GIF version | ||
| Description: Every integer greater than 1 and less than or equal to 8 is the sum of at most 4 primes. (Contributed by AV, 24-Jul-2020.) (Proof shortened by AV, 2-Aug-2020.) |
| Ref | Expression |
|---|---|
| nnsum4primesle9 | ⊢ ((𝑁 ∈ (ℤ≥‘2) ∧ 𝑁 ≤ 8) → ∃𝑑 ∈ ℕ ∃𝑓 ∈ (ℙ ↑m (1...𝑑))(𝑑 ≤ 4 ∧ 𝑁 = Σ𝑘 ∈ (1...𝑑)(𝑓‘𝑘))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nnsum3primesle9 48986 | . 2 ⊢ ((𝑁 ∈ (ℤ≥‘2) ∧ 𝑁 ≤ 8) → ∃𝑑 ∈ ℕ ∃𝑓 ∈ (ℙ ↑m (1...𝑑))(𝑑 ≤ 3 ∧ 𝑁 = Σ𝑘 ∈ (1...𝑑)(𝑓‘𝑘))) | |
| 2 | 3lt4 12523 | . . . . . 6 ⊢ 3 < 4 | |
| 3 | nnre 12346 | . . . . . . 7 ⊢ (𝑑 ∈ ℕ → 𝑑 ∈ ℝ) | |
| 4 | 3re 12427 | . . . . . . . 8 ⊢ 3 ∈ ℝ | |
| 5 | 4 | a1i 11 | . . . . . . 7 ⊢ (𝑑 ∈ ℕ → 3 ∈ ℝ) |
| 6 | 4re 12431 | . . . . . . . 8 ⊢ 4 ∈ ℝ | |
| 7 | 6 | a1i 11 | . . . . . . 7 ⊢ (𝑑 ∈ ℕ → 4 ∈ ℝ) |
| 8 | leltletr 11405 | . . . . . . 7 ⊢ ((𝑑 ∈ ℝ ∧ 3 ∈ ℝ ∧ 4 ∈ ℝ) → ((𝑑 ≤ 3 ∧ 3 < 4) → 𝑑 ≤ 4)) | |
| 9 | 3, 5, 7, 8 | syl3anc 1398 | . . . . . 6 ⊢ (𝑑 ∈ ℕ → ((𝑑 ≤ 3 ∧ 3 < 4) → 𝑑 ≤ 4)) |
| 10 | 2, 9 | mpan2i 710 | . . . . 5 ⊢ (𝑑 ∈ ℕ → (𝑑 ≤ 3 → 𝑑 ≤ 4)) |
| 11 | 10 | anim1d 623 | . . . 4 ⊢ (𝑑 ∈ ℕ → ((𝑑 ≤ 3 ∧ 𝑁 = Σ𝑘 ∈ (1...𝑑)(𝑓‘𝑘)) → (𝑑 ≤ 4 ∧ 𝑁 = Σ𝑘 ∈ (1...𝑑)(𝑓‘𝑘)))) |
| 12 | 11 | reximdv 3177 | . . 3 ⊢ (𝑑 ∈ ℕ → (∃𝑓 ∈ (ℙ ↑m (1...𝑑))(𝑑 ≤ 3 ∧ 𝑁 = Σ𝑘 ∈ (1...𝑑)(𝑓‘𝑘)) → ∃𝑓 ∈ (ℙ ↑m (1...𝑑))(𝑑 ≤ 4 ∧ 𝑁 = Σ𝑘 ∈ (1...𝑑)(𝑓‘𝑘)))) |
| 13 | 12 | reximia 3097 | . 2 ⊢ (∃𝑑 ∈ ℕ ∃𝑓 ∈ (ℙ ↑m (1...𝑑))(𝑑 ≤ 3 ∧ 𝑁 = Σ𝑘 ∈ (1...𝑑)(𝑓‘𝑘)) → ∃𝑑 ∈ ℕ ∃𝑓 ∈ (ℙ ↑m (1...𝑑))(𝑑 ≤ 4 ∧ 𝑁 = Σ𝑘 ∈ (1...𝑑)(𝑓‘𝑘))) |
| 14 | 1, 13 | syl 18 | 1 ⊢ ((𝑁 ∈ (ℤ≥‘2) ∧ 𝑁 ≤ 8) → ∃𝑑 ∈ ℕ ∃𝑓 ∈ (ℙ ↑m (1...𝑑))(𝑑 ≤ 4 ∧ 𝑁 = Σ𝑘 ∈ (1...𝑑)(𝑓‘𝑘))) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 = wceq 1569 ∈ wcel 2144 ∃wrex 3086 class class class wbr 5102 ‘cfv 6539 (class class class)co 7421 ↑m cmap 8851 ℝcr 11203 1c1 11205 < clt 11347 ≤ cle 11348 ℕcn 12339 2c2 12401 3c3 12402 4c4 12403 8c8 12407 ℤ≥cuz 12969 ...cfz 13643 Σcsu 15859 ℙcprime 16852 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-rep 5231 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7752 ax-inf2 9646 ax-cnex 11260 ax-resscn 11261 ax-1cn 11262 ax-icn 11263 ax-addcl 11264 ax-addrcl 11265 ax-mulcl 11266 ax-mulrcl 11267 ax-mulcom 11268 ax-addass 11269 ax-mulass 11270 ax-distr 11271 ax-i2m1 11272 ax-1ne0 11273 ax-1rid 11274 ax-rnegex 11275 ax-rrecex 11276 ax-cnre 11277 ax-pre-lttri 11278 ax-pre-lttrn 11279 ax-pre-ltadd 11280 ax-pre-mulgt0 11281 ax-pre-sup 11282 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 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-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-ss 3896 df-pss 4014 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-int 4907 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5545 df-eprel 5550 df-po 5558 df-so 5559 df-fr 5603 df-se 5604 df-we 5605 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-pred 6304 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6494 df-fun 6541 df-fn 6542 df-f 6543 df-f1 6544 df-fo 6545 df-f1o 6546 df-fv 6547 df-isom 6548 df-riota 7378 df-ov 7424 df-oprab 7425 df-mpo 7426 df-om 7879 df-1st 8002 df-2nd 8003 df-frecs 8303 df-wrecs 8334 df-recs 8383 df-rdg 8422 df-1o 8480 df-2o 8481 df-er 8721 df-map 8853 df-en 8978 df-dom 8979 df-sdom 8980 df-fin 8981 df-sup 9438 df-inf 9439 df-oi 9508 df-card 10024 df-pnf 11349 df-mnf 11350 df-xr 11351 df-ltxr 11352 df-le 11353 df-sub 11547 df-neg 11548 df-div 11978 df-nn 12340 df-2 12409 df-3 12410 df-4 12411 df-5 12412 df-6 12413 df-7 12414 df-8 12415 df-9 12416 df-n0 12611 df-z 12698 df-dec 12819 df-uz 12970 df-rp 13125 df-fz 13644 df-fzo 13793 df-seq 14149 df-exp 14209 df-hash 14479 df-cj 15272 df-re 15273 df-im 15274 df-sqrt 15408 df-abs 15409 df-clim 15661 df-sum 15860 df-dvds 16429 df-prm 16853 df-even 48818 df-odd 48819 df-gbe 48940 |
| This theorem is used by: wtgoldbnnsum4prm 48994 |
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