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Theorem even3prm2 45059
Description: If an even number is the sum of three prime numbers, one of the prime numbers must be 2. (Contributed by AV, 25-Dec-2021.)
Assertion
Ref Expression
even3prm2 ((𝑁 ∈ Even ∧ (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ) ∧ 𝑁 = ((𝑃 + 𝑄) + 𝑅)) → (𝑃 = 2 ∨ 𝑄 = 2 ∨ 𝑅 = 2))

Proof of Theorem even3prm2
StepHypRef Expression
1 olc 864 . . . 4 (𝑅 = 2 → ((𝑃 = 2 ∨ 𝑄 = 2) ∨ 𝑅 = 2))
21a1d 25 . . 3 (𝑅 = 2 → ((𝑁 ∈ Even ∧ (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ) ∧ 𝑁 = ((𝑃 + 𝑄) + 𝑅)) → ((𝑃 = 2 ∨ 𝑄 = 2) ∨ 𝑅 = 2)))
3 df-ne 2943 . . . . . . . . . . . 12 (𝑅 ≠ 2 ↔ ¬ 𝑅 = 2)
4 eldifsn 4717 . . . . . . . . . . . . . 14 (𝑅 ∈ (ℙ ∖ {2}) ↔ (𝑅 ∈ ℙ ∧ 𝑅 ≠ 2))
5 oddprmALTV 45027 . . . . . . . . . . . . . . 15 (𝑅 ∈ (ℙ ∖ {2}) → 𝑅 ∈ Odd )
6 emoo 45044 . . . . . . . . . . . . . . . 16 ((𝑁 ∈ Even ∧ 𝑅 ∈ Odd ) → (𝑁𝑅) ∈ Odd )
76expcom 413 . . . . . . . . . . . . . . 15 (𝑅 ∈ Odd → (𝑁 ∈ Even → (𝑁𝑅) ∈ Odd ))
85, 7syl 17 . . . . . . . . . . . . . 14 (𝑅 ∈ (ℙ ∖ {2}) → (𝑁 ∈ Even → (𝑁𝑅) ∈ Odd ))
94, 8sylbir 234 . . . . . . . . . . . . 13 ((𝑅 ∈ ℙ ∧ 𝑅 ≠ 2) → (𝑁 ∈ Even → (𝑁𝑅) ∈ Odd ))
109ex 412 . . . . . . . . . . . 12 (𝑅 ∈ ℙ → (𝑅 ≠ 2 → (𝑁 ∈ Even → (𝑁𝑅) ∈ Odd )))
113, 10syl5bir 242 . . . . . . . . . . 11 (𝑅 ∈ ℙ → (¬ 𝑅 = 2 → (𝑁 ∈ Even → (𝑁𝑅) ∈ Odd )))
1211com23 86 . . . . . . . . . 10 (𝑅 ∈ ℙ → (𝑁 ∈ Even → (¬ 𝑅 = 2 → (𝑁𝑅) ∈ Odd )))
13123ad2ant3 1133 . . . . . . . . 9 ((𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ) → (𝑁 ∈ Even → (¬ 𝑅 = 2 → (𝑁𝑅) ∈ Odd )))
1413impcom 407 . . . . . . . 8 ((𝑁 ∈ Even ∧ (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ)) → (¬ 𝑅 = 2 → (𝑁𝑅) ∈ Odd ))
15143adant3 1130 . . . . . . 7 ((𝑁 ∈ Even ∧ (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ) ∧ 𝑁 = ((𝑃 + 𝑄) + 𝑅)) → (¬ 𝑅 = 2 → (𝑁𝑅) ∈ Odd ))
1615impcom 407 . . . . . 6 ((¬ 𝑅 = 2 ∧ (𝑁 ∈ Even ∧ (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ) ∧ 𝑁 = ((𝑃 + 𝑄) + 𝑅))) → (𝑁𝑅) ∈ Odd )
17 3simpa 1146 . . . . . . . 8 ((𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ) → (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ))
18173ad2ant2 1132 . . . . . . 7 ((𝑁 ∈ Even ∧ (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ) ∧ 𝑁 = ((𝑃 + 𝑄) + 𝑅)) → (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ))
1918adantl 481 . . . . . 6 ((¬ 𝑅 = 2 ∧ (𝑁 ∈ Even ∧ (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ) ∧ 𝑁 = ((𝑃 + 𝑄) + 𝑅))) → (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ))
20 eqcom 2745 . . . . . . . . 9 (𝑁 = ((𝑃 + 𝑄) + 𝑅) ↔ ((𝑃 + 𝑄) + 𝑅) = 𝑁)
21 evenz 44970 . . . . . . . . . . . . 13 (𝑁 ∈ Even → 𝑁 ∈ ℤ)
2221zcnd 12356 . . . . . . . . . . . 12 (𝑁 ∈ Even → 𝑁 ∈ ℂ)
2322adantr 480 . . . . . . . . . . 11 ((𝑁 ∈ Even ∧ (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ)) → 𝑁 ∈ ℂ)
24 prmz 16308 . . . . . . . . . . . . . 14 (𝑅 ∈ ℙ → 𝑅 ∈ ℤ)
2524zcnd 12356 . . . . . . . . . . . . 13 (𝑅 ∈ ℙ → 𝑅 ∈ ℂ)
26253ad2ant3 1133 . . . . . . . . . . . 12 ((𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ) → 𝑅 ∈ ℂ)
2726adantl 481 . . . . . . . . . . 11 ((𝑁 ∈ Even ∧ (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ)) → 𝑅 ∈ ℂ)
28 prmz 16308 . . . . . . . . . . . . . . 15 (𝑃 ∈ ℙ → 𝑃 ∈ ℤ)
29 prmz 16308 . . . . . . . . . . . . . . 15 (𝑄 ∈ ℙ → 𝑄 ∈ ℤ)
30 zaddcl 12290 . . . . . . . . . . . . . . 15 ((𝑃 ∈ ℤ ∧ 𝑄 ∈ ℤ) → (𝑃 + 𝑄) ∈ ℤ)
3128, 29, 30syl2an 595 . . . . . . . . . . . . . 14 ((𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ) → (𝑃 + 𝑄) ∈ ℤ)
3231zcnd 12356 . . . . . . . . . . . . 13 ((𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ) → (𝑃 + 𝑄) ∈ ℂ)
33323adant3 1130 . . . . . . . . . . . 12 ((𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ) → (𝑃 + 𝑄) ∈ ℂ)
3433adantl 481 . . . . . . . . . . 11 ((𝑁 ∈ Even ∧ (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ)) → (𝑃 + 𝑄) ∈ ℂ)
3523, 27, 34subadd2d 11281 . . . . . . . . . 10 ((𝑁 ∈ Even ∧ (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ)) → ((𝑁𝑅) = (𝑃 + 𝑄) ↔ ((𝑃 + 𝑄) + 𝑅) = 𝑁))
3635biimprd 247 . . . . . . . . 9 ((𝑁 ∈ Even ∧ (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ)) → (((𝑃 + 𝑄) + 𝑅) = 𝑁 → (𝑁𝑅) = (𝑃 + 𝑄)))
3720, 36syl5bi 241 . . . . . . . 8 ((𝑁 ∈ Even ∧ (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ)) → (𝑁 = ((𝑃 + 𝑄) + 𝑅) → (𝑁𝑅) = (𝑃 + 𝑄)))
38373impia 1115 . . . . . . 7 ((𝑁 ∈ Even ∧ (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ) ∧ 𝑁 = ((𝑃 + 𝑄) + 𝑅)) → (𝑁𝑅) = (𝑃 + 𝑄))
3938adantl 481 . . . . . 6 ((¬ 𝑅 = 2 ∧ (𝑁 ∈ Even ∧ (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ) ∧ 𝑁 = ((𝑃 + 𝑄) + 𝑅))) → (𝑁𝑅) = (𝑃 + 𝑄))
40 odd2prm2 45058 . . . . . 6 (((𝑁𝑅) ∈ Odd ∧ (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ) ∧ (𝑁𝑅) = (𝑃 + 𝑄)) → (𝑃 = 2 ∨ 𝑄 = 2))
4116, 19, 39, 40syl3anc 1369 . . . . 5 ((¬ 𝑅 = 2 ∧ (𝑁 ∈ Even ∧ (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ) ∧ 𝑁 = ((𝑃 + 𝑄) + 𝑅))) → (𝑃 = 2 ∨ 𝑄 = 2))
4241orcd 869 . . . 4 ((¬ 𝑅 = 2 ∧ (𝑁 ∈ Even ∧ (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ) ∧ 𝑁 = ((𝑃 + 𝑄) + 𝑅))) → ((𝑃 = 2 ∨ 𝑄 = 2) ∨ 𝑅 = 2))
4342ex 412 . . 3 𝑅 = 2 → ((𝑁 ∈ Even ∧ (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ) ∧ 𝑁 = ((𝑃 + 𝑄) + 𝑅)) → ((𝑃 = 2 ∨ 𝑄 = 2) ∨ 𝑅 = 2)))
442, 43pm2.61i 182 . 2 ((𝑁 ∈ Even ∧ (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ) ∧ 𝑁 = ((𝑃 + 𝑄) + 𝑅)) → ((𝑃 = 2 ∨ 𝑄 = 2) ∨ 𝑅 = 2))
45 df-3or 1086 . 2 ((𝑃 = 2 ∨ 𝑄 = 2 ∨ 𝑅 = 2) ↔ ((𝑃 = 2 ∨ 𝑄 = 2) ∨ 𝑅 = 2))
4644, 45sylibr 233 1 ((𝑁 ∈ Even ∧ (𝑃 ∈ ℙ ∧ 𝑄 ∈ ℙ ∧ 𝑅 ∈ ℙ) ∧ 𝑁 = ((𝑃 + 𝑄) + 𝑅)) → (𝑃 = 2 ∨ 𝑄 = 2 ∨ 𝑅 = 2))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 395  wo 843  w3o 1084  w3a 1085   = wceq 1539  wcel 2108  wne 2942  cdif 3880  {csn 4558  (class class class)co 7255  cc 10800   + caddc 10805  cmin 11135  2c2 11958  cz 12249  cprime 16304   Even ceven 44964   Odd codd 44965
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-10 2139  ax-11 2156  ax-12 2173  ax-ext 2709  ax-sep 5218  ax-nul 5225  ax-pow 5283  ax-pr 5347  ax-un 7566  ax-cnex 10858  ax-resscn 10859  ax-1cn 10860  ax-icn 10861  ax-addcl 10862  ax-addrcl 10863  ax-mulcl 10864  ax-mulrcl 10865  ax-mulcom 10866  ax-addass 10867  ax-mulass 10868  ax-distr 10869  ax-i2m1 10870  ax-1ne0 10871  ax-1rid 10872  ax-rnegex 10873  ax-rrecex 10874  ax-cnre 10875  ax-pre-lttri 10876  ax-pre-lttrn 10877  ax-pre-ltadd 10878  ax-pre-mulgt0 10879  ax-pre-sup 10880
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3or 1086  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1784  df-nf 1788  df-sb 2069  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2817  df-nfc 2888  df-ne 2943  df-nel 3049  df-ral 3068  df-rex 3069  df-reu 3070  df-rmo 3071  df-rab 3072  df-v 3424  df-sbc 3712  df-csb 3829  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-pss 3902  df-nul 4254  df-if 4457  df-pw 4532  df-sn 4559  df-pr 4561  df-tp 4563  df-op 4565  df-uni 4837  df-iun 4923  df-br 5071  df-opab 5133  df-mpt 5154  df-tr 5188  df-id 5480  df-eprel 5486  df-po 5494  df-so 5495  df-fr 5535  df-we 5537  df-xp 5586  df-rel 5587  df-cnv 5588  df-co 5589  df-dm 5590  df-rn 5591  df-res 5592  df-ima 5593  df-pred 6191  df-ord 6254  df-on 6255  df-lim 6256  df-suc 6257  df-iota 6376  df-fun 6420  df-fn 6421  df-f 6422  df-f1 6423  df-fo 6424  df-f1o 6425  df-fv 6426  df-riota 7212  df-ov 7258  df-oprab 7259  df-mpo 7260  df-om 7688  df-2nd 7805  df-frecs 8068  df-wrecs 8099  df-recs 8173  df-rdg 8212  df-1o 8267  df-2o 8268  df-er 8456  df-en 8692  df-dom 8693  df-sdom 8694  df-fin 8695  df-sup 9131  df-pnf 10942  df-mnf 10943  df-xr 10944  df-ltxr 10945  df-le 10946  df-sub 11137  df-neg 11138  df-div 11563  df-nn 11904  df-2 11966  df-3 11967  df-n0 12164  df-z 12250  df-uz 12512  df-rp 12660  df-seq 13650  df-exp 13711  df-cj 14738  df-re 14739  df-im 14740  df-sqrt 14874  df-abs 14875  df-dvds 15892  df-prm 16305  df-even 44966  df-odd 44967
This theorem is referenced by:  mogoldbblem  45060
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