lgscllem - Intuitionistic Logic Explorer

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Theorem lgscllem 16331

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 16328	. 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 16325	. . . . . . 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 11068	. . . . . 6 ⊢ (𝐴 ∈ ℤ → (𝐴↑2) ∈ ℤ)
10		1zzd 9682	. . . . . 6 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) → 1 ∈ ℤ)
11		zdceq 9731	. . . . . 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 9667	. . . . . . 7 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) → 0 ∈ ℤ)
19		zdclt 9733	. . . . . . 7 ⊢ ((𝑁 ∈ ℤ ∧ 0 ∈ ℤ) → DECID 𝑁 < 0)
20	17, 18, 19	syl2anc 415	. . . . . 6 ⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) → DECID 𝑁 < 0)
21		zdclt 9733	. . . . . . 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 9974	. . . . . 6 ⊢ ℕ = (ℤ_≥‘1)
27		1zzd 9682	. . . . . 6 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ ¬ 𝑁 = 0) → 1 ∈ ℤ)
28		df-ne 2421	. . . . . . . 8 ⊢ (𝑁 ≠ 0 ↔ ¬ 𝑁 = 0)
29	1, 3	lgsfcl2 16330	. . . . . . . . 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 5846	. . . . . 6 ⊢ ((((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ ¬ 𝑁 = 0) ∧ 𝑦 ∈ ℕ) → (𝐹‘𝑦) ∈ 𝑍)
33	3	lgslem3 16326	. . . . . . 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 10922	. . . . 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 11889	. . . . . 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 5847	. . . 4 ⊢ (((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ ¬ 𝑁 = 0) → (seq1( · , 𝐹)‘(abs‘𝑁)) ∈ 𝑍)
42	3	lgslem3 16326	. . . 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 9731	. . . 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 4131 ↦ cmpt 4193 ⟶wf 5376 ‘cfv 5380 (class class class)co 6088 0cc0 8185 1c1 8186 + caddc 8188 · cmul 8190 < clt 8366 ≤ cle 8367 − cmin 8504 -cneg 8505 / cdiv 9010 ℕcn 9313 2c2 9364 7c7 9369 8c8 9370 ℤcz 9655 mod cmo 10780 seqcseq 10905 ↑cexp 10996 abscabs 11785 ∥ cdvds 12579 ℙcprime 12910 pCnt cpc 13092 /_L clgs 16321

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 4248 ax-sep 4251 ax-nul 4261 ax-pow 4313 ax-pr 4348 ax-un 4580 ax-setind 4686 ax-iinf 4737 ax-cnex 8276 ax-resscn 8277 ax-1cn 8278 ax-1re 8279 ax-icn 8280 ax-addcl 8281 ax-addrcl 8282 ax-mulcl 8283 ax-mulrcl 8284 ax-addcom 8285 ax-mulcom 8286 ax-addass 8287 ax-mulass 8288 ax-distr 8289 ax-i2m1 8290 ax-0lt1 8291 ax-1rid 8292 ax-0id 8293 ax-rnegex 8294 ax-precex 8295 ax-cnre 8296 ax-pre-ltirr 8297 ax-pre-ltwlin 8298 ax-pre-lttrn 8299 ax-pre-apti 8300 ax-pre-ltadd 8301 ax-pre-mulgt0 8302 ax-pre-mulext 8303 ax-arch 8304 ax-caucvg 8305

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 4132 df-opab 4194 df-mpt 4195 df-tr 4232 df-id 4440 df-po 4443 df-iso 4444 df-iord 4513 df-on 4515 df-ilim 4516 df-suc 4518 df-iom 4740 df-xp 4782 df-rel 4783 df-cnv 4784 df-co 4785 df-dm 4786 df-rn 4787 df-res 4788 df-ima 4789 df-iota 5340 df-fun 5382 df-fn 5383 df-f 5384 df-f1 5385 df-fo 5386 df-f1o 5387 df-fv 5388 df-isom 5389 df-riota 6041 df-ov 6091 df-oprab 6092 df-mpo 6093 df-1st 6378 df-2nd 6379 df-recs 6580 df-irdg 6645 df-frec 6666 df-1o 6691 df-2o 6692 df-oadd 6695 df-er 6811 df-en 7027 df-dom 7028 df-fin 7029 df-sup 7330 df-inf 7331 df-pnf 8368 df-mnf 8369 df-xr 8370 df-ltxr 8371 df-le 8372 df-sub 8506 df-neg 8507 df-reap 8911 df-ap 8918 df-div 9011 df-inn 9314 df-2 9372 df-3 9373 df-4 9374 df-5 9375 df-6 9376 df-7 9377 df-8 9378 df-n0 9575 df-z 9656 df-uz 9938 df-q 10036 df-rp 10072 df-fz 10429 df-fzo 10567 df-fl 10722 df-mod 10781 df-seqfrec 10906 df-exp 10997 df-ihash 11237 df-cj 11629 df-re 11630 df-im 11631 df-rsqrt 11786 df-abs 11787 df-clim 12070 df-proddc 12343 df-dvds 12580 df-gcd 12756 df-prm 12911 df-phi 13018 df-pc 13093 df-lgs 16322

This theorem is used by: lgscl2 16336

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