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| Mirrors > Home > MPE Home > Th. List > lgssq2 | Structured version Visualization version GIF version | ||
| Description: The Legendre symbol at a square is equal to 1. (Contributed by Mario Carneiro, 5-Feb-2015.) |
| Ref | Expression |
|---|---|
| lgssq2 | ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℕ ∧ (𝐴 gcd 𝑁) = 1) → (𝐴 /L (𝑁↑2)) = 1) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | simp1 1142 | . . 3 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℕ ∧ (𝐴 gcd 𝑁) = 1) → 𝐴 ∈ ℤ) | |
| 2 | nnz 12536 | . . . 4 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℤ) | |
| 3 | 2 | 3ad2ant2 1140 | . . 3 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℕ ∧ (𝐴 gcd 𝑁) = 1) → 𝑁 ∈ ℤ) |
| 4 | nnne0 12202 | . . . 4 ⊢ (𝑁 ∈ ℕ → 𝑁 ≠ 0) | |
| 5 | 4 | 3ad2ant2 1140 | . . 3 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℕ ∧ (𝐴 gcd 𝑁) = 1) → 𝑁 ≠ 0) |
| 6 | lgsdi 27315 | . . 3 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (𝑁 ≠ 0 ∧ 𝑁 ≠ 0)) → (𝐴 /L (𝑁 · 𝑁)) = ((𝐴 /L 𝑁) · (𝐴 /L 𝑁))) | |
| 7 | 1, 3, 3, 5, 5, 6 | syl32anc 1386 | . 2 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℕ ∧ (𝐴 gcd 𝑁) = 1) → (𝐴 /L (𝑁 · 𝑁)) = ((𝐴 /L 𝑁) · (𝐴 /L 𝑁))) |
| 8 | nncn 12173 | . . . . 5 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℂ) | |
| 9 | 8 | 3ad2ant2 1140 | . . . 4 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℕ ∧ (𝐴 gcd 𝑁) = 1) → 𝑁 ∈ ℂ) |
| 10 | 9 | sqvald 14096 | . . 3 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℕ ∧ (𝐴 gcd 𝑁) = 1) → (𝑁↑2) = (𝑁 · 𝑁)) |
| 11 | 10 | oveq2d 7372 | . 2 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℕ ∧ (𝐴 gcd 𝑁) = 1) → (𝐴 /L (𝑁↑2)) = (𝐴 /L (𝑁 · 𝑁))) |
| 12 | lgscl 27292 | . . . . . 6 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝐴 /L 𝑁) ∈ ℤ) | |
| 13 | 1, 3, 12 | syl2anc 590 | . . . . 5 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℕ ∧ (𝐴 gcd 𝑁) = 1) → (𝐴 /L 𝑁) ∈ ℤ) |
| 14 | 13 | zred 12624 | . . . 4 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℕ ∧ (𝐴 gcd 𝑁) = 1) → (𝐴 /L 𝑁) ∈ ℝ) |
| 15 | absresq 15255 | . . . 4 ⊢ ((𝐴 /L 𝑁) ∈ ℝ → ((abs‘(𝐴 /L 𝑁))↑2) = ((𝐴 /L 𝑁)↑2)) | |
| 16 | 14, 15 | syl 17 | . . 3 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℕ ∧ (𝐴 gcd 𝑁) = 1) → ((abs‘(𝐴 /L 𝑁))↑2) = ((𝐴 /L 𝑁)↑2)) |
| 17 | lgsabs1 27317 | . . . . . . 7 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((abs‘(𝐴 /L 𝑁)) = 1 ↔ (𝐴 gcd 𝑁) = 1)) | |
| 18 | 2, 17 | sylan2 599 | . . . . . 6 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℕ) → ((abs‘(𝐴 /L 𝑁)) = 1 ↔ (𝐴 gcd 𝑁) = 1)) |
| 19 | 18 | biimp3ar 1478 | . . . . 5 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℕ ∧ (𝐴 gcd 𝑁) = 1) → (abs‘(𝐴 /L 𝑁)) = 1) |
| 20 | 19 | oveq1d 7371 | . . . 4 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℕ ∧ (𝐴 gcd 𝑁) = 1) → ((abs‘(𝐴 /L 𝑁))↑2) = (1↑2)) |
| 21 | sq1 14148 | . . . 4 ⊢ (1↑2) = 1 | |
| 22 | 20, 21 | eqtrdi 2790 | . . 3 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℕ ∧ (𝐴 gcd 𝑁) = 1) → ((abs‘(𝐴 /L 𝑁))↑2) = 1) |
| 23 | 13 | zcnd 12625 | . . . 4 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℕ ∧ (𝐴 gcd 𝑁) = 1) → (𝐴 /L 𝑁) ∈ ℂ) |
| 24 | 23 | sqvald 14096 | . . 3 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℕ ∧ (𝐴 gcd 𝑁) = 1) → ((𝐴 /L 𝑁)↑2) = ((𝐴 /L 𝑁) · (𝐴 /L 𝑁))) |
| 25 | 16, 22, 24 | 3eqtr3d 2782 | . 2 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℕ ∧ (𝐴 gcd 𝑁) = 1) → 1 = ((𝐴 /L 𝑁) · (𝐴 /L 𝑁))) |
| 26 | 7, 11, 25 | 3eqtr4d 2784 | 1 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℕ ∧ (𝐴 gcd 𝑁) = 1) → (𝐴 /L (𝑁↑2)) = 1) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 207 ∧ w3a 1092 = wceq 1547 ∈ wcel 2119 ≠ wne 2934 ‘cfv 6485 (class class class)co 7356 ℂcc 11027 ℝcr 11028 0cc0 11029 1c1 11030 · cmul 11034 ℕcn 12165 2c2 12227 ℤcz 12515 ↑cexp 14014 abscabs 15187 gcd cgcd 16454 /L clgs 27275 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2711 ax-rep 5199 ax-sep 5218 ax-nul 5228 ax-pow 5294 ax-pr 5362 ax-un 7678 ax-cnex 11085 ax-resscn 11086 ax-1cn 11087 ax-icn 11088 ax-addcl 11089 ax-addrcl 11090 ax-mulcl 11091 ax-mulrcl 11092 ax-mulcom 11093 ax-addass 11094 ax-mulass 11095 ax-distr 11096 ax-i2m1 11097 ax-1ne0 11098 ax-1rid 11099 ax-rnegex 11100 ax-rrecex 11101 ax-cnre 11102 ax-pre-lttri 11103 ax-pre-lttrn 11104 ax-pre-ltadd 11105 ax-pre-mulgt0 11106 ax-pre-sup 11107 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3or 1093 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2718 df-cleq 2731 df-clel 2814 df-nfc 2888 df-ne 2935 df-nel 3039 df-ral 3054 df-rex 3064 df-rmo 3344 df-reu 3345 df-rab 3392 df-v 3433 df-sbc 3724 df-csb 3832 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3903 df-nul 4262 df-if 4455 df-pw 4531 df-sn 4556 df-pr 4558 df-op 4562 df-uni 4839 df-int 4878 df-iun 4923 df-br 5073 df-opab 5135 df-mpt 5154 df-tr 5180 df-id 5513 df-eprel 5518 df-po 5526 df-so 5527 df-fr 5571 df-we 5573 df-xp 5624 df-rel 5625 df-cnv 5626 df-co 5627 df-dm 5628 df-rn 5629 df-res 5630 df-ima 5631 df-pred 6252 df-ord 6313 df-on 6314 df-lim 6315 df-suc 6316 df-iota 6441 df-fun 6487 df-fn 6488 df-f 6489 df-f1 6490 df-fo 6491 df-f1o 6492 df-fv 6493 df-riota 7313 df-ov 7359 df-oprab 7360 df-mpo 7361 df-om 7807 df-1st 7931 df-2nd 7932 df-frecs 8221 df-wrecs 8252 df-recs 8301 df-rdg 8339 df-1o 8395 df-2o 8396 df-oadd 8399 df-er 8633 df-en 8884 df-dom 8885 df-sdom 8886 df-fin 8887 df-sup 9345 df-inf 9346 df-dju 9816 df-card 9854 df-pnf 11172 df-mnf 11173 df-xr 11174 df-ltxr 11175 df-le 11176 df-sub 11370 df-neg 11371 df-div 11799 df-nn 12166 df-2 12235 df-3 12236 df-n0 12429 df-xnn0 12502 df-z 12516 df-uz 12780 df-q 12890 df-rp 12934 df-fz 13453 df-fzo 13600 df-fl 13742 df-mod 13820 df-seq 13955 df-exp 14015 df-hash 14284 df-cj 15052 df-re 15053 df-im 15054 df-sqrt 15188 df-abs 15189 df-dvds 16213 df-gcd 16455 df-prm 16632 df-phi 16727 df-pc 16799 df-lgs 27276 |
| This theorem is referenced by: lgs1 27322 lgsquad2lem2 27366 |
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