| Mathbox for Alexander van der Vekens |
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| Mirrors > Home > MPE Home > Th. List > Mathboxes > 8gbe | Structured version Visualization version GIF version | ||
| Description: 8 is an even Goldbach number. (Contributed by AV, 20-Jul-2020.) |
| Ref | Expression |
|---|---|
| 8gbe | ⊢ 8 ∈ GoldbachEven |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 8even 48727 | . 2 ⊢ 8 ∈ Even | |
| 2 | 5prm 17233 | . . 3 ⊢ 5 ∈ ℙ | |
| 3 | 3prm 16817 | . . 3 ⊢ 3 ∈ ℙ | |
| 4 | 5odd 48724 | . . . 4 ⊢ 5 ∈ Odd | |
| 5 | 3odd 48722 | . . . 4 ⊢ 3 ∈ Odd | |
| 6 | 5p3e8 12454 | . . . . 5 ⊢ (5 + 3) = 8 | |
| 7 | 6 | eqcomi 2769 | . . . 4 ⊢ 8 = (5 + 3) |
| 8 | 4, 5, 7 | 3pm3.2i 1358 | . . 3 ⊢ (5 ∈ Odd ∧ 3 ∈ Odd ∧ 8 = (5 + 3)) |
| 9 | eleq1 2848 | . . . . 5 ⊢ (𝑝 = 5 → (𝑝 ∈ Odd ↔ 5 ∈ Odd )) | |
| 10 | biidd 265 | . . . . 5 ⊢ (𝑝 = 5 → (𝑞 ∈ Odd ↔ 𝑞 ∈ Odd )) | |
| 11 | oveq1 7416 | . . . . . 6 ⊢ (𝑝 = 5 → (𝑝 + 𝑞) = (5 + 𝑞)) | |
| 12 | 11 | eqeq2d 2771 | . . . . 5 ⊢ (𝑝 = 5 → (8 = (𝑝 + 𝑞) ↔ 8 = (5 + 𝑞))) |
| 13 | 9, 10, 12 | 3anbi123d 1464 | . . . 4 ⊢ (𝑝 = 5 → ((𝑝 ∈ Odd ∧ 𝑞 ∈ Odd ∧ 8 = (𝑝 + 𝑞)) ↔ (5 ∈ Odd ∧ 𝑞 ∈ Odd ∧ 8 = (5 + 𝑞)))) |
| 14 | biidd 265 | . . . . 5 ⊢ (𝑞 = 3 → (5 ∈ Odd ↔ 5 ∈ Odd )) | |
| 15 | eleq1 2848 | . . . . 5 ⊢ (𝑞 = 3 → (𝑞 ∈ Odd ↔ 3 ∈ Odd )) | |
| 16 | oveq2 7417 | . . . . . 6 ⊢ (𝑞 = 3 → (5 + 𝑞) = (5 + 3)) | |
| 17 | 16 | eqeq2d 2771 | . . . . 5 ⊢ (𝑞 = 3 → (8 = (5 + 𝑞) ↔ 8 = (5 + 3))) |
| 18 | 14, 15, 17 | 3anbi123d 1464 | . . . 4 ⊢ (𝑞 = 3 → ((5 ∈ Odd ∧ 𝑞 ∈ Odd ∧ 8 = (5 + 𝑞)) ↔ (5 ∈ Odd ∧ 3 ∈ Odd ∧ 8 = (5 + 3)))) |
| 19 | 13, 18 | rspc2ev 3589 | . . 3 ⊢ ((5 ∈ ℙ ∧ 3 ∈ ℙ ∧ (5 ∈ Odd ∧ 3 ∈ Odd ∧ 8 = (5 + 3))) → ∃𝑝 ∈ ℙ ∃𝑞 ∈ ℙ (𝑝 ∈ Odd ∧ 𝑞 ∈ Odd ∧ 8 = (𝑝 + 𝑞))) |
| 20 | 2, 3, 8, 19 | mp3an 1490 | . 2 ⊢ ∃𝑝 ∈ ℙ ∃𝑞 ∈ ℙ (𝑝 ∈ Odd ∧ 𝑞 ∈ Odd ∧ 8 = (𝑝 + 𝑞)) |
| 21 | isgbe 48765 | . 2 ⊢ (8 ∈ GoldbachEven ↔ (8 ∈ Even ∧ ∃𝑝 ∈ ℙ ∃𝑞 ∈ ℙ (𝑝 ∈ Odd ∧ 𝑞 ∈ Odd ∧ 8 = (𝑝 + 𝑞)))) | |
| 22 | 1, 20, 21 | mpbir2an 724 | 1 ⊢ 8 ∈ GoldbachEven |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∧ w3a 1103 = wceq 1570 ∈ wcel 2145 ∃wrex 3086 (class class class)co 7409 + caddc 11160 3c3 12353 5c5 12355 8c8 12358 ℙcprime 16794 Even ceven 48638 Odd codd 48639 GoldbachEven cgbe 48759 |
| 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 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7735 ax-cnex 11213 ax-resscn 11214 ax-1cn 11215 ax-icn 11216 ax-addcl 11217 ax-addrcl 11218 ax-mulcl 11219 ax-mulrcl 11220 ax-mulcom 11221 ax-addass 11222 ax-mulass 11223 ax-distr 11224 ax-i2m1 11225 ax-1ne0 11226 ax-1rid 11227 ax-rnegex 11228 ax-rrecex 11229 ax-cnre 11230 ax-pre-lttri 11231 ax-pre-lttrn 11232 ax-pre-ltadd 11233 ax-pre-mulgt0 11234 ax-pre-sup 11235 |
| 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-rmo 3365 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 5543 df-eprel 5548 df-po 5556 df-so 5557 df-fr 5601 df-we 5603 df-xp 5654 df-rel 5655 df-cnv 5656 df-co 5657 df-dm 5658 df-rn 5659 df-res 5660 df-ima 5661 df-pred 6294 df-ord 6355 df-on 6356 df-lim 6357 df-suc 6358 df-iota 6484 df-fun 6530 df-fn 6531 df-f 6532 df-f1 6533 df-fo 6534 df-f1o 6535 df-fv 6536 df-riota 7366 df-ov 7412 df-oprab 7413 df-mpo 7414 df-om 7862 df-1st 7985 df-2nd 7986 df-frecs 8278 df-wrecs 8309 df-recs 8358 df-rdg 8397 df-1o 8455 df-2o 8456 df-er 8696 df-en 8953 df-dom 8954 df-sdom 8955 df-fin 8956 df-sup 9412 df-inf 9413 df-pnf 11302 df-mnf 11303 df-xr 11304 df-ltxr 11305 df-le 11306 df-sub 11500 df-neg 11501 df-div 11929 df-nn 12291 df-2 12360 df-3 12361 df-4 12362 df-5 12363 df-6 12364 df-7 12365 df-8 12366 df-9 12367 df-n0 12562 df-z 12649 df-dec 12770 df-uz 12921 df-rp 13076 df-fz 13595 df-seq 14099 df-exp 14159 df-cj 15219 df-re 15220 df-im 15221 df-sqrt 15355 df-abs 15356 df-dvds 16376 df-prm 16795 df-even 48640 df-odd 48641 df-gbe 48762 |
| This theorem is used by: nnsum3primesle9 48808 |
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