lgscllem - Intuitionistic Logic Explorer

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Theorem lgscllem 16126

Description: The Legendre symbol is an element of 𝑍. (Contributed by Mario Carneiro, 4-Feb-2015.)

**Hypotheses**
Ref	Expression
lgsval.1	⊢ 𝐹 = (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, (if(𝑛 = 2, if(2 ∥ 𝐴, 0, if((𝐴 mod 8) ∈ {1, 7}, 1, -1)), ((((𝐴↑((𝑛 − 1) / 2)) + 1) mod 𝑛) − 1))↑(𝑛 pCnt 𝑁)), 1))
lgsfcl2.z	⊢ 𝑍 = {𝑥 ∈ ℤ ∣ (abs‘𝑥) ≤ 1}

**Assertion**
Ref	Expression
lgscllem	⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝐴 /_L 𝑁) ∈ 𝑍)

Distinct variable groups: 𝐴,𝑛,𝑥 𝑥,𝐹 𝑛,𝑁,𝑥 𝑛,𝑍 Allowed substitution hints: 𝐹(𝑛) 𝑍(𝑥)

Proof of Theorem lgscllem Dummy variables 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		lgsval.1	. . 3 ⊢ 𝐹 = (𝑛 ∈ ℕ ↦ if(𝑛 ∈ ℙ, (if(𝑛 = 2, if(2 ∥ 𝐴, 0, if((𝐴 mod 8) ∈ {1, 7}, 1, -1)), ((((𝐴↑((𝑛 − 1) / 2)) + 1) mod 𝑛) − 1))↑(𝑛 pCnt 𝑁)), 1))
2	1	lgsval 16123	. 2 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝐴 /_L 𝑁) = if(𝑁 = 0, if((𝐴↑2) = 1, 1, 0), (if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1) · (seq1( · , 𝐹)‘(abs‘𝑁)))))
3		lgsfcl2.z	. . . . . . . 8 ⊢ 𝑍 = {𝑥 ∈ ℤ ∣ (abs‘𝑥) ≤ 1}
4	3	lgslem2 16120	. . . . . . 7 ⊢ (-1 ∈ 𝑍 ∧ 0 ∈ 𝑍 ∧ 1 ∈ 𝑍)
5	4	simp3i 1039	. . . . . 6 ⊢ 1 ∈ 𝑍
6	5	a1i 9	. . . . 5 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) → 1 ∈ 𝑍)
7	4	simp2i 1038	. . . . . 6 ⊢ 0 ∈ 𝑍
8	7	a1i 9	. . . . 5 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) → 0 ∈ 𝑍)
9		zsqcl 11047	. . . . . 6 ⊢ (𝐴 ∈ ℤ → (𝐴↑2) ∈ ℤ)
10		1zzd 9671	. . . . . 6 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) → 1 ∈ ℤ)
11		zdceq 9720	. . . . . 6 ⊢ (((𝐴↑2) ∈ ℤ ∧ 1 ∈ ℤ) → DECID (𝐴↑2) = 1)
12	9, 10, 11	syl2an2r 603	. . . . 5 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) → DECID (𝐴↑2) = 1)
13	6, 8, 12	ifcldcd 3678	. . . 4 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) → if((𝐴↑2) = 1, 1, 0) ∈ 𝑍)
14	13	adantr 276	. . 3 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑁 = 0) → if((𝐴↑2) = 1, 1, 0) ∈ 𝑍)
15	4	simp1i 1037	. . . . . 6 ⊢ -1 ∈ 𝑍
16	15	a1i 9	. . . . 5 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) → -1 ∈ 𝑍)
17		simpr 110	. . . . . . 7 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) → 𝑁 ∈ ℤ)
18		0zd 9656	. . . . . . 7 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) → 0 ∈ ℤ)
19		zdclt 9722	. . . . . . 7 ⊢ ((𝑁 ∈ ℤ ∧ 0 ∈ ℤ) → DECID 𝑁 < 0)
20	17, 18, 19	syl2anc 415	. . . . . 6 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) → DECID 𝑁 < 0)
21		zdclt 9722	. . . . . . 7 ⊢ ((𝐴 ∈ ℤ ∧ 0 ∈ ℤ) → DECID 𝐴 < 0)
22	18, 21	syldan 282	. . . . . 6 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) → DECID 𝐴 < 0)
23		dcan2 947	. . . . . 6 ⊢ (DECID 𝑁 < 0 → (DECID 𝐴 < 0 → DECID (𝑁 < 0 ∧ 𝐴 < 0)))
24	20, 22, 23	sylc 62	. . . . 5 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) → DECID (𝑁 < 0 ∧ 𝐴 < 0))
25	16, 6, 24	ifcldcd 3678	. . . 4 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) → if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1) ∈ 𝑍)
26		nnuz 9958	. . . . . 6 ⊢ ℕ = (ℤ_≥‘1)
27		1zzd 9671	. . . . . 6 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ ¬ 𝑁 = 0) → 1 ∈ ℤ)
28		df-ne 2421	. . . . . . . 8 ⊢ (𝑁 ≠ 0 ↔ ¬ 𝑁 = 0)
29	1, 3	lgsfcl2 16125	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → 𝐹:ℕ⟶𝑍)
30	29	3expa 1234	. . . . . . . 8 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑁 ≠ 0) → 𝐹:ℕ⟶𝑍)
31	28, 30	sylan2br 288	. . . . . . 7 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ ¬ 𝑁 = 0) → 𝐹:ℕ⟶𝑍)
32	31	ffvelcdmda 5843	. . . . . 6 ⊢ ((((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ ¬ 𝑁 = 0) ∧ 𝑦 ∈ ℕ) → (𝐹‘𝑦) ∈ 𝑍)
33	3	lgslem3 16121	. . . . . . 7 ⊢ ((𝑦 ∈ 𝑍 ∧ 𝑧 ∈ 𝑍) → (𝑦 · 𝑧) ∈ 𝑍)
34	33	adantl 277	. . . . . 6 ⊢ ((((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ ¬ 𝑁 = 0) ∧ (𝑦 ∈ 𝑍 ∧ 𝑧 ∈ 𝑍)) → (𝑦 · 𝑧) ∈ 𝑍)
35	26, 27, 32, 34	seqf 10901	. . . . 5 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ ¬ 𝑁 = 0) → seq1( · , 𝐹):ℕ⟶𝑍)
36		simplr 533	. . . . . 6 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ ¬ 𝑁 = 0) → 𝑁 ∈ ℤ)
37		simpr 110	. . . . . . 7 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ ¬ 𝑁 = 0) → ¬ 𝑁 = 0)
38	37	neqned 2427	. . . . . 6 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ ¬ 𝑁 = 0) → 𝑁 ≠ 0)
39		nnabscl 11866	. . . . . 6 ⊢ ((𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → (abs‘𝑁) ∈ ℕ)
40	36, 38, 39	syl2anc 415	. . . . 5 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ ¬ 𝑁 = 0) → (abs‘𝑁) ∈ ℕ)
41	35, 40	ffvelcdmd 5844	. . . 4 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ ¬ 𝑁 = 0) → (seq1( · , 𝐹)‘(abs‘𝑁)) ∈ 𝑍)
42	3	lgslem3 16121	. . . 4 ⊢ ((if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1) ∈ 𝑍 ∧ (seq1( · , 𝐹)‘(abs‘𝑁)) ∈ 𝑍) → (if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1) · (seq1( · , 𝐹)‘(abs‘𝑁))) ∈ 𝑍)
43	25, 41, 42	syl2an2r 603	. . 3 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ ¬ 𝑁 = 0) → (if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1) · (seq1( · , 𝐹)‘(abs‘𝑁))) ∈ 𝑍)
44		zdceq 9720	. . . 4 ⊢ ((𝑁 ∈ ℤ ∧ 0 ∈ ℤ) → DECID 𝑁 = 0)
45	17, 18, 44	syl2anc 415	. . 3 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) → DECID 𝑁 = 0)
46	14, 43, 45	ifcldadc 3670	. 2 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) → if(𝑁 = 0, if((𝐴↑2) = 1, 1, 0), (if((𝑁 < 0 ∧ 𝐴 < 0), -1, 1) · (seq1( · , 𝐹)‘(abs‘𝑁)))) ∈ 𝑍)
47	2, 46	eqeltrd 2315	1 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝐴 /_L 𝑁) ∈ 𝑍)

Colors of variables: wff set class

This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∧ wa 104 DECID wdc 846 = wceq 1402 ∈ wcel 2209 ≠ wne 2420 {crab 2532 ifcif 3638 {cpr 3710 class class class wbr 4130 ↦ cmpt 4192 ⟶wf 5373 ‘cfv 5377 (class class class)co 6085 0cc0 8179 1c1 8180 + caddc 8182 · cmul 8184 < clt 8360 ≤ cle 8361 − cmin 8497 -cneg 8498 / cdiv 9002 ℕcn 9304 2c2 9355 7c7 9360 8c8 9361 ℤcz 9644 mod cmo 10759 seqcseq 10884 ↑cexp 10975 abscabs 11763 ∥ cdvds 12554 ℙcprime 12885 pCnt cpc 13063 /_L clgs 16116

This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-coll 4246 ax-sep 4249 ax-nul 4259 ax-pow 4311 ax-pr 4346 ax-un 4578 ax-setind 4684 ax-iinf 4735 ax-cnex 8270 ax-resscn 8271 ax-1cn 8272 ax-1re 8273 ax-icn 8274 ax-addcl 8275 ax-addrcl 8276 ax-mulcl 8277 ax-mulrcl 8278 ax-addcom 8279 ax-mulcom 8280 ax-addass 8281 ax-mulass 8282 ax-distr 8283 ax-i2m1 8284 ax-0lt1 8285 ax-1rid 8286 ax-0id 8287 ax-rnegex 8288 ax-precex 8289 ax-cnre 8290 ax-pre-ltirr 8291 ax-pre-ltwlin 8292 ax-pre-lttrn 8293 ax-pre-apti 8294 ax-pre-ltadd 8295 ax-pre-mulgt0 8296 ax-pre-mulext 8297 ax-arch 8298 ax-caucvg 8299

This proof depends on definitions: df-bi 117 df-stab 843 df-dc 847 df-3or 1010 df-3an 1011 df-tru 1405 df-fal 1408 df-xor 1425 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-reu 2535 df-rmo 2536 df-rab 2537 df-v 2823 df-sbc 3052 df-csb 3148 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-nul 3521 df-if 3639 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-int 3971 df-iun 4014 df-br 4131 df-opab 4193 df-mpt 4194 df-tr 4230 df-id 4438 df-po 4441 df-iso 4442 df-iord 4511 df-on 4513 df-ilim 4514 df-suc 4516 df-iom 4738 df-xp 4780 df-rel 4781 df-cnv 4782 df-co 4783 df-dm 4784 df-rn 4785 df-res 4786 df-ima 4787 df-iota 5337 df-fun 5379 df-fn 5380 df-f 5381 df-f1 5382 df-fo 5383 df-f1o 5384 df-fv 5385 df-isom 5386 df-riota 6038 df-ov 6088 df-oprab 6089 df-mpo 6090 df-1st 6374 df-2nd 6375 df-recs 6576 df-irdg 6641 df-frec 6662 df-1o 6687 df-2o 6688 df-oadd 6691 df-er 6807 df-en 7023 df-dom 7024 df-fin 7025 df-sup 7324 df-inf 7325 df-pnf 8362 df-mnf 8363 df-xr 8364 df-ltxr 8365 df-le 8366 df-sub 8499 df-neg 8500 df-reap 8903 df-ap 8910 df-div 9003 df-inn 9305 df-2 9363 df-3 9364 df-4 9365 df-5 9366 df-6 9367 df-7 9368 df-8 9369 df-n0 9564 df-z 9645 df-uz 9922 df-q 10020 df-rp 10055 df-fz 10412 df-fzo 10550 df-fl 10705 df-mod 10760 df-seqfrec 10885 df-exp 10976 df-ihash 11215 df-cj 11607 df-re 11608 df-im 11609 df-rsqrt 11764 df-abs 11765 df-clim 12045 df-proddc 12318 df-dvds 12555 df-gcd 12731 df-prm 12886 df-phi 12989 df-pc 13064 df-lgs 16117

This theorem is used by: lgscl2 16131

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