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| Mirrors > Home > MPE Home > Th. List > zgcdsq | Structured version Visualization version GIF version | ||
| Description: nn0gcdsq 16681 extended to integers by symmetry. (Contributed by Stefan O'Rear, 15-Sep-2014.) |
| Ref | Expression |
|---|---|
| zgcdsq | ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ) → ((𝐴 gcd 𝐵)↑2) = ((𝐴↑2) gcd (𝐵↑2))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | gcdabs 16460 | . . . 4 ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ) → ((abs‘𝐴) gcd (abs‘𝐵)) = (𝐴 gcd 𝐵)) | |
| 2 | 1 | eqcomd 2741 | . . 3 ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ) → (𝐴 gcd 𝐵) = ((abs‘𝐴) gcd (abs‘𝐵))) |
| 3 | 2 | oveq1d 7373 | . 2 ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ) → ((𝐴 gcd 𝐵)↑2) = (((abs‘𝐴) gcd (abs‘𝐵))↑2)) |
| 4 | nn0abscl 15237 | . . 3 ⊢ (𝐴 ∈ ℤ → (abs‘𝐴) ∈ ℕ0) | |
| 5 | nn0abscl 15237 | . . 3 ⊢ (𝐵 ∈ ℤ → (abs‘𝐵) ∈ ℕ0) | |
| 6 | nn0gcdsq 16681 | . . 3 ⊢ (((abs‘𝐴) ∈ ℕ0 ∧ (abs‘𝐵) ∈ ℕ0) → (((abs‘𝐴) gcd (abs‘𝐵))↑2) = (((abs‘𝐴)↑2) gcd ((abs‘𝐵)↑2))) | |
| 7 | 4, 5, 6 | syl2an 597 | . 2 ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ) → (((abs‘𝐴) gcd (abs‘𝐵))↑2) = (((abs‘𝐴)↑2) gcd ((abs‘𝐵)↑2))) |
| 8 | zre 12494 | . . . . 5 ⊢ (𝐴 ∈ ℤ → 𝐴 ∈ ℝ) | |
| 9 | 8 | adantr 480 | . . . 4 ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ) → 𝐴 ∈ ℝ) |
| 10 | absresq 15227 | . . . 4 ⊢ (𝐴 ∈ ℝ → ((abs‘𝐴)↑2) = (𝐴↑2)) | |
| 11 | 9, 10 | syl 17 | . . 3 ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ) → ((abs‘𝐴)↑2) = (𝐴↑2)) |
| 12 | zre 12494 | . . . . 5 ⊢ (𝐵 ∈ ℤ → 𝐵 ∈ ℝ) | |
| 13 | 12 | adantl 481 | . . . 4 ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ) → 𝐵 ∈ ℝ) |
| 14 | absresq 15227 | . . . 4 ⊢ (𝐵 ∈ ℝ → ((abs‘𝐵)↑2) = (𝐵↑2)) | |
| 15 | 13, 14 | syl 17 | . . 3 ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ) → ((abs‘𝐵)↑2) = (𝐵↑2)) |
| 16 | 11, 15 | oveq12d 7376 | . 2 ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ) → (((abs‘𝐴)↑2) gcd ((abs‘𝐵)↑2)) = ((𝐴↑2) gcd (𝐵↑2))) |
| 17 | 3, 7, 16 | 3eqtrd 2774 | 1 ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ) → ((𝐴 gcd 𝐵)↑2) = ((𝐴↑2) gcd (𝐵↑2))) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1542 ∈ wcel 2114 ‘cfv 6491 (class class class)co 7358 ℝcr 11027 2c2 12202 ℕ0cn0 12403 ℤcz 12490 ↑cexp 13986 abscabs 15159 gcd cgcd 16423 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2183 ax-ext 2707 ax-sep 5240 ax-nul 5250 ax-pow 5309 ax-pr 5376 ax-un 7680 ax-cnex 11084 ax-resscn 11085 ax-1cn 11086 ax-icn 11087 ax-addcl 11088 ax-addrcl 11089 ax-mulcl 11090 ax-mulrcl 11091 ax-mulcom 11092 ax-addass 11093 ax-mulass 11094 ax-distr 11095 ax-i2m1 11096 ax-1ne0 11097 ax-1rid 11098 ax-rnegex 11099 ax-rrecex 11100 ax-cnre 11101 ax-pre-lttri 11102 ax-pre-lttrn 11103 ax-pre-ltadd 11104 ax-pre-mulgt0 11105 ax-pre-sup 11106 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2538 df-eu 2568 df-clab 2714 df-cleq 2727 df-clel 2810 df-nfc 2884 df-ne 2932 df-nel 3036 df-ral 3051 df-rex 3060 df-rmo 3349 df-reu 3350 df-rab 3399 df-v 3441 df-sbc 3740 df-csb 3849 df-dif 3903 df-un 3905 df-in 3907 df-ss 3917 df-pss 3920 df-nul 4285 df-if 4479 df-pw 4555 df-sn 4580 df-pr 4582 df-op 4586 df-uni 4863 df-iun 4947 df-br 5098 df-opab 5160 df-mpt 5179 df-tr 5205 df-id 5518 df-eprel 5523 df-po 5531 df-so 5532 df-fr 5576 df-we 5578 df-xp 5629 df-rel 5630 df-cnv 5631 df-co 5632 df-dm 5633 df-rn 5634 df-res 5635 df-ima 5636 df-pred 6258 df-ord 6319 df-on 6320 df-lim 6321 df-suc 6322 df-iota 6447 df-fun 6493 df-fn 6494 df-f 6495 df-f1 6496 df-fo 6497 df-f1o 6498 df-fv 6499 df-riota 7315 df-ov 7361 df-oprab 7362 df-mpo 7363 df-om 7809 df-2nd 7934 df-frecs 8223 df-wrecs 8254 df-recs 8303 df-rdg 8341 df-er 8635 df-en 8886 df-dom 8887 df-sdom 8888 df-sup 9347 df-inf 9348 df-pnf 11170 df-mnf 11171 df-xr 11172 df-ltxr 11173 df-le 11174 df-sub 11368 df-neg 11369 df-div 11797 df-nn 12148 df-2 12210 df-3 12211 df-n0 12404 df-z 12491 df-uz 12754 df-rp 12908 df-fl 13714 df-mod 13792 df-seq 13927 df-exp 13987 df-cj 15024 df-re 15025 df-im 15026 df-sqrt 15160 df-abs 15161 df-dvds 16182 df-gcd 16424 |
| This theorem is referenced by: numdensq 16683 |
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