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Mirrors > Home > MPE Home > Th. List > 2sq | Structured version Visualization version GIF version |
Description: All primes of the form 4𝑘 + 1 are sums of two squares. This is Metamath 100 proof #20. (Contributed by Mario Carneiro, 20-Jun-2015.) |
Ref | Expression |
---|---|
2sq | ⊢ ((𝑃 ∈ ℙ ∧ (𝑃 mod 4) = 1) → ∃𝑥 ∈ ℤ ∃𝑦 ∈ ℤ 𝑃 = ((𝑥↑2) + (𝑦↑2))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid 2728 | . . 3 ⊢ ran (𝑤 ∈ ℤ[i] ↦ ((abs‘𝑤)↑2)) = ran (𝑤 ∈ ℤ[i] ↦ ((abs‘𝑤)↑2)) | |
2 | oveq1 7422 | . . . . . . 7 ⊢ (𝑎 = 𝑥 → (𝑎 gcd 𝑏) = (𝑥 gcd 𝑏)) | |
3 | 2 | eqeq1d 2730 | . . . . . 6 ⊢ (𝑎 = 𝑥 → ((𝑎 gcd 𝑏) = 1 ↔ (𝑥 gcd 𝑏) = 1)) |
4 | oveq1 7422 | . . . . . . . 8 ⊢ (𝑎 = 𝑥 → (𝑎↑2) = (𝑥↑2)) | |
5 | 4 | oveq1d 7430 | . . . . . . 7 ⊢ (𝑎 = 𝑥 → ((𝑎↑2) + (𝑏↑2)) = ((𝑥↑2) + (𝑏↑2))) |
6 | 5 | eqeq2d 2739 | . . . . . 6 ⊢ (𝑎 = 𝑥 → (𝑧 = ((𝑎↑2) + (𝑏↑2)) ↔ 𝑧 = ((𝑥↑2) + (𝑏↑2)))) |
7 | 3, 6 | anbi12d 631 | . . . . 5 ⊢ (𝑎 = 𝑥 → (((𝑎 gcd 𝑏) = 1 ∧ 𝑧 = ((𝑎↑2) + (𝑏↑2))) ↔ ((𝑥 gcd 𝑏) = 1 ∧ 𝑧 = ((𝑥↑2) + (𝑏↑2))))) |
8 | oveq2 7423 | . . . . . . 7 ⊢ (𝑏 = 𝑦 → (𝑥 gcd 𝑏) = (𝑥 gcd 𝑦)) | |
9 | 8 | eqeq1d 2730 | . . . . . 6 ⊢ (𝑏 = 𝑦 → ((𝑥 gcd 𝑏) = 1 ↔ (𝑥 gcd 𝑦) = 1)) |
10 | oveq1 7422 | . . . . . . . 8 ⊢ (𝑏 = 𝑦 → (𝑏↑2) = (𝑦↑2)) | |
11 | 10 | oveq2d 7431 | . . . . . . 7 ⊢ (𝑏 = 𝑦 → ((𝑥↑2) + (𝑏↑2)) = ((𝑥↑2) + (𝑦↑2))) |
12 | 11 | eqeq2d 2739 | . . . . . 6 ⊢ (𝑏 = 𝑦 → (𝑧 = ((𝑥↑2) + (𝑏↑2)) ↔ 𝑧 = ((𝑥↑2) + (𝑦↑2)))) |
13 | 9, 12 | anbi12d 631 | . . . . 5 ⊢ (𝑏 = 𝑦 → (((𝑥 gcd 𝑏) = 1 ∧ 𝑧 = ((𝑥↑2) + (𝑏↑2))) ↔ ((𝑥 gcd 𝑦) = 1 ∧ 𝑧 = ((𝑥↑2) + (𝑦↑2))))) |
14 | 7, 13 | cbvrex2vw 3235 | . . . 4 ⊢ (∃𝑎 ∈ ℤ ∃𝑏 ∈ ℤ ((𝑎 gcd 𝑏) = 1 ∧ 𝑧 = ((𝑎↑2) + (𝑏↑2))) ↔ ∃𝑥 ∈ ℤ ∃𝑦 ∈ ℤ ((𝑥 gcd 𝑦) = 1 ∧ 𝑧 = ((𝑥↑2) + (𝑦↑2)))) |
15 | 14 | abbii 2798 | . . 3 ⊢ {𝑧 ∣ ∃𝑎 ∈ ℤ ∃𝑏 ∈ ℤ ((𝑎 gcd 𝑏) = 1 ∧ 𝑧 = ((𝑎↑2) + (𝑏↑2)))} = {𝑧 ∣ ∃𝑥 ∈ ℤ ∃𝑦 ∈ ℤ ((𝑥 gcd 𝑦) = 1 ∧ 𝑧 = ((𝑥↑2) + (𝑦↑2)))} |
16 | 1, 15 | 2sqlem11 27356 | . 2 ⊢ ((𝑃 ∈ ℙ ∧ (𝑃 mod 4) = 1) → 𝑃 ∈ ran (𝑤 ∈ ℤ[i] ↦ ((abs‘𝑤)↑2))) |
17 | 1 | 2sqlem2 27345 | . 2 ⊢ (𝑃 ∈ ran (𝑤 ∈ ℤ[i] ↦ ((abs‘𝑤)↑2)) ↔ ∃𝑥 ∈ ℤ ∃𝑦 ∈ ℤ 𝑃 = ((𝑥↑2) + (𝑦↑2))) |
18 | 16, 17 | sylib 217 | 1 ⊢ ((𝑃 ∈ ℙ ∧ (𝑃 mod 4) = 1) → ∃𝑥 ∈ ℤ ∃𝑦 ∈ ℤ 𝑃 = ((𝑥↑2) + (𝑦↑2))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 395 = wceq 1534 ∈ wcel 2099 {cab 2705 ∃wrex 3066 ↦ cmpt 5226 ran crn 5674 ‘cfv 6543 (class class class)co 7415 1c1 11134 + caddc 11136 2c2 12292 4c4 12294 ℤcz 12583 mod cmo 13861 ↑cexp 14053 abscabs 15208 gcd cgcd 16463 ℙcprime 16636 ℤ[i]cgz 16892 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-rep 5280 ax-sep 5294 ax-nul 5301 ax-pow 5360 ax-pr 5424 ax-un 7735 ax-cnex 11189 ax-resscn 11190 ax-1cn 11191 ax-icn 11192 ax-addcl 11193 ax-addrcl 11194 ax-mulcl 11195 ax-mulrcl 11196 ax-mulcom 11197 ax-addass 11198 ax-mulass 11199 ax-distr 11200 ax-i2m1 11201 ax-1ne0 11202 ax-1rid 11203 ax-rnegex 11204 ax-rrecex 11205 ax-cnre 11206 ax-pre-lttri 11207 ax-pre-lttrn 11208 ax-pre-ltadd 11209 ax-pre-mulgt0 11210 ax-pre-sup 11211 ax-addf 11212 ax-mulf 11213 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2937 df-nel 3043 df-ral 3058 df-rex 3067 df-rmo 3372 df-reu 3373 df-rab 3429 df-v 3472 df-sbc 3776 df-csb 3891 df-dif 3948 df-un 3950 df-in 3952 df-ss 3962 df-pss 3964 df-nul 4320 df-if 4526 df-pw 4601 df-sn 4626 df-pr 4628 df-tp 4630 df-op 4632 df-uni 4905 df-int 4946 df-iun 4994 df-iin 4995 df-br 5144 df-opab 5206 df-mpt 5227 df-tr 5261 df-id 5571 df-eprel 5577 df-po 5585 df-so 5586 df-fr 5628 df-se 5629 df-we 5630 df-xp 5679 df-rel 5680 df-cnv 5681 df-co 5682 df-dm 5683 df-rn 5684 df-res 5685 df-ima 5686 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-isom 6552 df-riota 7371 df-ov 7418 df-oprab 7419 df-mpo 7420 df-of 7680 df-ofr 7681 df-om 7866 df-1st 7988 df-2nd 7989 df-supp 8161 df-tpos 8226 df-frecs 8281 df-wrecs 8312 df-recs 8386 df-rdg 8425 df-1o 8481 df-2o 8482 df-oadd 8485 df-er 8719 df-ec 8721 df-qs 8725 df-map 8841 df-pm 8842 df-ixp 8911 df-en 8959 df-dom 8960 df-sdom 8961 df-fin 8962 df-fsupp 9381 df-sup 9460 df-inf 9461 df-oi 9528 df-dju 9919 df-card 9957 df-pnf 11275 df-mnf 11276 df-xr 11277 df-ltxr 11278 df-le 11279 df-sub 11471 df-neg 11472 df-div 11897 df-nn 12238 df-2 12300 df-3 12301 df-4 12302 df-5 12303 df-6 12304 df-7 12305 df-8 12306 df-9 12307 df-n0 12498 df-xnn0 12570 df-z 12584 df-dec 12703 df-uz 12848 df-q 12958 df-rp 13002 df-fz 13512 df-fzo 13655 df-fl 13784 df-mod 13862 df-seq 13994 df-exp 14054 df-hash 14317 df-cj 15073 df-re 15074 df-im 15075 df-sqrt 15209 df-abs 15210 df-dvds 16226 df-gcd 16464 df-prm 16637 df-phi 16729 df-pc 16800 df-gz 16893 df-struct 17110 df-sets 17127 df-slot 17145 df-ndx 17157 df-base 17175 df-ress 17204 df-plusg 17240 df-mulr 17241 df-starv 17242 df-sca 17243 df-vsca 17244 df-ip 17245 df-tset 17246 df-ple 17247 df-ds 17249 df-unif 17250 df-hom 17251 df-cco 17252 df-0g 17417 df-gsum 17418 df-prds 17423 df-pws 17425 df-imas 17484 df-qus 17485 df-mre 17560 df-mrc 17561 df-acs 17563 df-mgm 18594 df-sgrp 18673 df-mnd 18689 df-mhm 18734 df-submnd 18735 df-grp 18887 df-minusg 18888 df-sbg 18889 df-mulg 19018 df-subg 19072 df-nsg 19073 df-eqg 19074 df-ghm 19162 df-cntz 19262 df-cmn 19731 df-abl 19732 df-mgp 20069 df-rng 20087 df-ur 20116 df-srg 20121 df-ring 20169 df-cring 20170 df-oppr 20267 df-dvdsr 20290 df-unit 20291 df-invr 20321 df-dvr 20334 df-rhm 20405 df-nzr 20446 df-subrng 20477 df-subrg 20502 df-drng 20620 df-field 20621 df-lmod 20739 df-lss 20810 df-lsp 20850 df-sra 21052 df-rgmod 21053 df-lidl 21098 df-rsp 21099 df-2idl 21138 df-rlreg 21224 df-domn 21225 df-idom 21226 df-cnfld 21274 df-zring 21367 df-zrh 21423 df-zn 21426 df-assa 21781 df-asp 21782 df-ascl 21783 df-psr 21836 df-mvr 21837 df-mpl 21838 df-opsr 21840 df-evls 22012 df-evl 22013 df-psr1 22093 df-vr1 22094 df-ply1 22095 df-coe1 22096 df-evl1 22229 df-mdeg 25982 df-deg1 25983 df-mon1 26060 df-uc1p 26061 df-q1p 26062 df-r1p 26063 df-lgs 27222 |
This theorem is referenced by: 2sqb 27359 2sqnn0 27365 |
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