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Theorem gcdcllem1 16595

Description: Lemma for gcdn0cl 16598, gcddvds 16599 and dvdslegcd 16600. (Contributed by Paul Chapman, 21-Mar-2011.)

**Hypothesis**
Ref	Expression
gcdcllem1.1	⊢ 𝑆 = {𝑧 ∈ ℤ ∣ ∀𝑛 ∈ 𝐴 𝑧 ∥ 𝑛}

**Assertion**
Ref	Expression
gcdcllem1	⊢ ((𝐴 ⊆ ℤ ∧ ∃𝑛 ∈ 𝐴 𝑛 ≠ 0) → (𝑆 ≠ ∅ ∧ ∃𝑥 ∈ ℤ ∀𝑦 ∈ 𝑆 𝑦 ≤ 𝑥))

Distinct variable groups: 𝐴,𝑛,𝑥,𝑦,𝑧 𝑥,𝑆 Allowed substitution hints: 𝑆(𝑦, 𝑧, 𝑛)

Proof of Theorem gcdcllem1 Dummy variable 𝑤 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		1z 12652	. . . . 5 ⊢ 1 ∈ ℤ
2		ssel 3928	. . . . . . 7 ⊢ (𝐴 ⊆ ℤ → (𝑛 ∈ 𝐴 → 𝑛 ∈ ℤ))
3		1dvds 16366	. . . . . . 7 ⊢ (𝑛 ∈ ℤ → 1 ∥ 𝑛)
4	2, 3	syl6 36	. . . . . 6 ⊢ (𝐴 ⊆ ℤ → (𝑛 ∈ 𝐴 → 1 ∥ 𝑛))
5	4	ralrimiv 3155	. . . . 5 ⊢ (𝐴 ⊆ ℤ → ∀𝑛 ∈ 𝐴 1 ∥ 𝑛)
6		breq1 5110	. . . . . . . 8 ⊢ (𝑧 = 1 → (𝑧 ∥ 𝑛 ↔ 1 ∥ 𝑛))
7	6	ralbidv 3187	. . . . . . 7 ⊢ (𝑧 = 1 → (∀𝑛 ∈ 𝐴 𝑧 ∥ 𝑛 ↔ ∀𝑛 ∈ 𝐴 1 ∥ 𝑛))
8		gcdcllem1.1	. . . . . . 7 ⊢ 𝑆 = {𝑧 ∈ ℤ ∣ ∀𝑛 ∈ 𝐴 𝑧 ∥ 𝑛}
9	7, 8	elrab2 3652	. . . . . 6 ⊢ (1 ∈ 𝑆 ↔ (1 ∈ ℤ ∧ ∀𝑛 ∈ 𝐴 1 ∥ 𝑛))
10	9	biimpri 231	. . . . 5 ⊢ ((1 ∈ ℤ ∧ ∀𝑛 ∈ 𝐴 1 ∥ 𝑛) → 1 ∈ 𝑆)
11	1, 5, 10	sylancr 599	. . . 4 ⊢ (𝐴 ⊆ ℤ → 1 ∈ 𝑆)
12	11	ne0d 4291	. . 3 ⊢ (𝐴 ⊆ ℤ → 𝑆 ≠ ∅)
13	12	adantr 486	. 2 ⊢ ((𝐴 ⊆ ℤ ∧ ∃𝑛 ∈ 𝐴 𝑛 ≠ 0) → 𝑆 ≠ ∅)
14		neeq1 3019	. . . 4 ⊢ (𝑛 = 𝑤 → (𝑛 ≠ 0 ↔ 𝑤 ≠ 0))
15	14	cbvrexvw 3243	. . 3 ⊢ (∃𝑛 ∈ 𝐴 𝑛 ≠ 0 ↔ ∃𝑤 ∈ 𝐴 𝑤 ≠ 0)
16		breq1 5110	. . . . . . . . . . . 12 ⊢ (𝑧 = 𝑦 → (𝑧 ∥ 𝑛 ↔ 𝑦 ∥ 𝑛))
17	16	ralbidv 3187	. . . . . . . . . . 11 ⊢ (𝑧 = 𝑦 → (∀𝑛 ∈ 𝐴 𝑧 ∥ 𝑛 ↔ ∀𝑛 ∈ 𝐴 𝑦 ∥ 𝑛))
18	17, 8	elrab2 3652	. . . . . . . . . 10 ⊢ (𝑦 ∈ 𝑆 ↔ (𝑦 ∈ ℤ ∧ ∀𝑛 ∈ 𝐴 𝑦 ∥ 𝑛))
19	18	simprbi 503	. . . . . . . . 9 ⊢ (𝑦 ∈ 𝑆 → ∀𝑛 ∈ 𝐴 𝑦 ∥ 𝑛)
20	18	simplbi 502	. . . . . . . . . 10 ⊢ (𝑦 ∈ 𝑆 → 𝑦 ∈ ℤ)
21		ssel2 3929	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ⊆ ℤ ∧ 𝑛 ∈ 𝐴) → 𝑛 ∈ ℤ)
22		dvdsleabs 16407	. . . . . . . . . . . . . . . 16 ⊢ ((𝑦 ∈ ℤ ∧ 𝑛 ∈ ℤ ∧ 𝑛 ≠ 0) → (𝑦 ∥ 𝑛 → 𝑦 ≤ (abs‘𝑛)))
23	22	3expia 1139	. . . . . . . . . . . . . . 15 ⊢ ((𝑦 ∈ ℤ ∧ 𝑛 ∈ ℤ) → (𝑛 ≠ 0 → (𝑦 ∥ 𝑛 → 𝑦 ≤ (abs‘𝑛))))
24	21, 23	sylan2 605	. . . . . . . . . . . . . 14 ⊢ ((𝑦 ∈ ℤ ∧ (𝐴 ⊆ ℤ ∧ 𝑛 ∈ 𝐴)) → (𝑛 ≠ 0 → (𝑦 ∥ 𝑛 → 𝑦 ≤ (abs‘𝑛))))
25	24	anassrs 473	. . . . . . . . . . . . 13 ⊢ (((𝑦 ∈ ℤ ∧ 𝐴 ⊆ ℤ) ∧ 𝑛 ∈ 𝐴) → (𝑛 ≠ 0 → (𝑦 ∥ 𝑛 → 𝑦 ≤ (abs‘𝑛))))
26	25	com23 87	. . . . . . . . . . . 12 ⊢ (((𝑦 ∈ ℤ ∧ 𝐴 ⊆ ℤ) ∧ 𝑛 ∈ 𝐴) → (𝑦 ∥ 𝑛 → (𝑛 ≠ 0 → 𝑦 ≤ (abs‘𝑛))))
27	26	ralrimiva 3156	. . . . . . . . . . 11 ⊢ ((𝑦 ∈ ℤ ∧ 𝐴 ⊆ ℤ) → ∀𝑛 ∈ 𝐴 (𝑦 ∥ 𝑛 → (𝑛 ≠ 0 → 𝑦 ≤ (abs‘𝑛))))
28	27	ancoms 464	. . . . . . . . . 10 ⊢ ((𝐴 ⊆ ℤ ∧ 𝑦 ∈ ℤ) → ∀𝑛 ∈ 𝐴 (𝑦 ∥ 𝑛 → (𝑛 ≠ 0 → 𝑦 ≤ (abs‘𝑛))))
29	20, 28	sylan2 605	. . . . . . . . 9 ⊢ ((𝐴 ⊆ ℤ ∧ 𝑦 ∈ 𝑆) → ∀𝑛 ∈ 𝐴 (𝑦 ∥ 𝑛 → (𝑛 ≠ 0 → 𝑦 ≤ (abs‘𝑛))))
30		r19.26 3124	. . . . . . . . . 10 ⊢ (∀𝑛 ∈ 𝐴 (𝑦 ∥ 𝑛 ∧ (𝑦 ∥ 𝑛 → (𝑛 ≠ 0 → 𝑦 ≤ (abs‘𝑛)))) ↔ (∀𝑛 ∈ 𝐴 𝑦 ∥ 𝑛 ∧ ∀𝑛 ∈ 𝐴 (𝑦 ∥ 𝑛 → (𝑛 ≠ 0 → 𝑦 ≤ (abs‘𝑛)))))
31		pm3.35 815	. . . . . . . . . . 11 ⊢ ((𝑦 ∥ 𝑛 ∧ (𝑦 ∥ 𝑛 → (𝑛 ≠ 0 → 𝑦 ≤ (abs‘𝑛)))) → (𝑛 ≠ 0 → 𝑦 ≤ (abs‘𝑛)))
32	31	ralimi 3101	. . . . . . . . . 10 ⊢ (∀𝑛 ∈ 𝐴 (𝑦 ∥ 𝑛 ∧ (𝑦 ∥ 𝑛 → (𝑛 ≠ 0 → 𝑦 ≤ (abs‘𝑛)))) → ∀𝑛 ∈ 𝐴 (𝑛 ≠ 0 → 𝑦 ≤ (abs‘𝑛)))
33	30, 32	sylbir 238	. . . . . . . . 9 ⊢ ((∀𝑛 ∈ 𝐴 𝑦 ∥ 𝑛 ∧ ∀𝑛 ∈ 𝐴 (𝑦 ∥ 𝑛 → (𝑛 ≠ 0 → 𝑦 ≤ (abs‘𝑛)))) → ∀𝑛 ∈ 𝐴 (𝑛 ≠ 0 → 𝑦 ≤ (abs‘𝑛)))
34	19, 29, 33	syl2an2 699	. . . . . . . 8 ⊢ ((𝐴 ⊆ ℤ ∧ 𝑦 ∈ 𝑆) → ∀𝑛 ∈ 𝐴 (𝑛 ≠ 0 → 𝑦 ≤ (abs‘𝑛)))
35	34	ralrimiva 3156	. . . . . . 7 ⊢ (𝐴 ⊆ ℤ → ∀𝑦 ∈ 𝑆 ∀𝑛 ∈ 𝐴 (𝑛 ≠ 0 → 𝑦 ≤ (abs‘𝑛)))
36		fveq2 6882	. . . . . . . . . . . 12 ⊢ (𝑛 = 𝑤 → (abs‘𝑛) = (abs‘𝑤))
37	36	breq2d 5119	. . . . . . . . . . 11 ⊢ (𝑛 = 𝑤 → (𝑦 ≤ (abs‘𝑛) ↔ 𝑦 ≤ (abs‘𝑤)))
38	14, 37	imbi12d 347	. . . . . . . . . 10 ⊢ (𝑛 = 𝑤 → ((𝑛 ≠ 0 → 𝑦 ≤ (abs‘𝑛)) ↔ (𝑤 ≠ 0 → 𝑦 ≤ (abs‘𝑤))))
39	38	cbvralvw 3242	. . . . . . . . 9 ⊢ (∀𝑛 ∈ 𝐴 (𝑛 ≠ 0 → 𝑦 ≤ (abs‘𝑛)) ↔ ∀𝑤 ∈ 𝐴 (𝑤 ≠ 0 → 𝑦 ≤ (abs‘𝑤)))
40	39	ralbii 3110	. . . . . . . 8 ⊢ (∀𝑦 ∈ 𝑆 ∀𝑛 ∈ 𝐴 (𝑛 ≠ 0 → 𝑦 ≤ (abs‘𝑛)) ↔ ∀𝑦 ∈ 𝑆 ∀𝑤 ∈ 𝐴 (𝑤 ≠ 0 → 𝑦 ≤ (abs‘𝑤)))
41		ralcom 3292	. . . . . . . 8 ⊢ (∀𝑦 ∈ 𝑆 ∀𝑤 ∈ 𝐴 (𝑤 ≠ 0 → 𝑦 ≤ (abs‘𝑤)) ↔ ∀𝑤 ∈ 𝐴 ∀𝑦 ∈ 𝑆 (𝑤 ≠ 0 → 𝑦 ≤ (abs‘𝑤)))
42		r19.21v 3189	. . . . . . . . 9 ⊢ (∀𝑦 ∈ 𝑆 (𝑤 ≠ 0 → 𝑦 ≤ (abs‘𝑤)) ↔ (𝑤 ≠ 0 → ∀𝑦 ∈ 𝑆 𝑦 ≤ (abs‘𝑤)))
43	42	ralbii 3110	. . . . . . . 8 ⊢ (∀𝑤 ∈ 𝐴 ∀𝑦 ∈ 𝑆 (𝑤 ≠ 0 → 𝑦 ≤ (abs‘𝑤)) ↔ ∀𝑤 ∈ 𝐴 (𝑤 ≠ 0 → ∀𝑦 ∈ 𝑆 𝑦 ≤ (abs‘𝑤)))
44	40, 41, 43	3bitri 300	. . . . . . 7 ⊢ (∀𝑦 ∈ 𝑆 ∀𝑛 ∈ 𝐴 (𝑛 ≠ 0 → 𝑦 ≤ (abs‘𝑛)) ↔ ∀𝑤 ∈ 𝐴 (𝑤 ≠ 0 → ∀𝑦 ∈ 𝑆 𝑦 ≤ (abs‘𝑤)))
45	35, 44	sylib 221	. . . . . 6 ⊢ (𝐴 ⊆ ℤ → ∀𝑤 ∈ 𝐴 (𝑤 ≠ 0 → ∀𝑦 ∈ 𝑆 𝑦 ≤ (abs‘𝑤)))
46		ssel2 3929	. . . . . . . . . . 11 ⊢ ((𝐴 ⊆ ℤ ∧ 𝑤 ∈ 𝐴) → 𝑤 ∈ ℤ)
47		nn0abscl 15403	. . . . . . . . . . 11 ⊢ (𝑤 ∈ ℤ → (abs‘𝑤) ∈ ℕ₀)
48	46, 47	syl 18	. . . . . . . . . 10 ⊢ ((𝐴 ⊆ ℤ ∧ 𝑤 ∈ 𝐴) → (abs‘𝑤) ∈ ℕ₀)
49	48	nn0zd 12644	. . . . . . . . 9 ⊢ ((𝐴 ⊆ ℤ ∧ 𝑤 ∈ 𝐴) → (abs‘𝑤) ∈ ℤ)
50		breq2 5111	. . . . . . . . . . 11 ⊢ (𝑥 = (abs‘𝑤) → (𝑦 ≤ 𝑥 ↔ 𝑦 ≤ (abs‘𝑤)))
51	50	ralbidv 3187	. . . . . . . . . 10 ⊢ (𝑥 = (abs‘𝑤) → (∀𝑦 ∈ 𝑆 𝑦 ≤ 𝑥 ↔ ∀𝑦 ∈ 𝑆 𝑦 ≤ (abs‘𝑤)))
52	51	adantl 487	. . . . . . . . 9 ⊢ (((𝐴 ⊆ ℤ ∧ 𝑤 ∈ 𝐴) ∧ 𝑥 = (abs‘𝑤)) → (∀𝑦 ∈ 𝑆 𝑦 ≤ 𝑥 ↔ ∀𝑦 ∈ 𝑆 𝑦 ≤ (abs‘𝑤)))
53	49, 52	rspcedv 3572	. . . . . . . 8 ⊢ ((𝐴 ⊆ ℤ ∧ 𝑤 ∈ 𝐴) → (∀𝑦 ∈ 𝑆 𝑦 ≤ (abs‘𝑤) → ∃𝑥 ∈ ℤ ∀𝑦 ∈ 𝑆 𝑦 ≤ 𝑥))
54	53	imim2d 58	. . . . . . 7 ⊢ ((𝐴 ⊆ ℤ ∧ 𝑤 ∈ 𝐴) → ((𝑤 ≠ 0 → ∀𝑦 ∈ 𝑆 𝑦 ≤ (abs‘𝑤)) → (𝑤 ≠ 0 → ∃𝑥 ∈ ℤ ∀𝑦 ∈ 𝑆 𝑦 ≤ 𝑥)))
55	54	ralimdva 3176	. . . . . 6 ⊢ (𝐴 ⊆ ℤ → (∀𝑤 ∈ 𝐴 (𝑤 ≠ 0 → ∀𝑦 ∈ 𝑆 𝑦 ≤ (abs‘𝑤)) → ∀𝑤 ∈ 𝐴 (𝑤 ≠ 0 → ∃𝑥 ∈ ℤ ∀𝑦 ∈ 𝑆 𝑦 ≤ 𝑥)))
56	45, 55	mpd 16	. . . . 5 ⊢ (𝐴 ⊆ ℤ → ∀𝑤 ∈ 𝐴 (𝑤 ≠ 0 → ∃𝑥 ∈ ℤ ∀𝑦 ∈ 𝑆 𝑦 ≤ 𝑥))
57		r19.23v 3191	. . . . 5 ⊢ (∀𝑤 ∈ 𝐴 (𝑤 ≠ 0 → ∃𝑥 ∈ ℤ ∀𝑦 ∈ 𝑆 𝑦 ≤ 𝑥) ↔ (∃𝑤 ∈ 𝐴 𝑤 ≠ 0 → ∃𝑥 ∈ ℤ ∀𝑦 ∈ 𝑆 𝑦 ≤ 𝑥))
58	56, 57	sylib 221	. . . 4 ⊢ (𝐴 ⊆ ℤ → (∃𝑤 ∈ 𝐴 𝑤 ≠ 0 → ∃𝑥 ∈ ℤ ∀𝑦 ∈ 𝑆 𝑦 ≤ 𝑥))
59	58	imp 412	. . 3 ⊢ ((𝐴 ⊆ ℤ ∧ ∃𝑤 ∈ 𝐴 𝑤 ≠ 0) → ∃𝑥 ∈ ℤ ∀𝑦 ∈ 𝑆 𝑦 ≤ 𝑥)
60	15, 59	sylan2b 606	. 2 ⊢ ((𝐴 ⊆ ℤ ∧ ∃𝑛 ∈ 𝐴 𝑛 ≠ 0) → ∃𝑥 ∈ ℤ ∀𝑦 ∈ 𝑆 𝑦 ≤ 𝑥)
61	13, 60	jca 521	1 ⊢ ((𝐴 ⊆ ℤ ∧ ∃𝑛 ∈ 𝐴 𝑛 ≠ 0) → (𝑆 ≠ ∅ ∧ ∃𝑥 ∈ ℤ ∀𝑦 ∈ 𝑆 𝑦 ≤ 𝑥))

Colors of variables: wff setvar class

This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1570 ∈ wcel 2145 ≠ wne 2957 ∀wral 3078 ∃wrex 3088 {crab 3414 ⊆ wss 3902 ∅c0 4282 class class class wbr 5107 ‘cfv 6537 0cc0 11128 1c1 11129 ≤ cle 11272 ℕ₀cn0 12532 ℤcz 12619 abscabs 15325 ∥ cdvds 16348

This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2734 ax-sep 5255 ax-nul 5267 ax-pow 5334 ax-pr 5402 ax-un 7740 ax-cnex 11184 ax-resscn 11185 ax-1cn 11186 ax-icn 11187 ax-addcl 11188 ax-addrcl 11189 ax-mulcl 11190 ax-mulrcl 11191 ax-mulcom 11192 ax-addass 11193 ax-mulass 11194 ax-distr 11195 ax-i2m1 11196 ax-1ne0 11197 ax-1rid 11198 ax-rnegex 11199 ax-rrecex 11200 ax-cnre 11201 ax-pre-lttri 11202 ax-pre-lttrn 11203 ax-pre-ltadd 11204 ax-pre-mulgt0 11205 ax-pre-sup 11206

This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3064 df-ral 3079 df-rex 3089 df-rmo 3367 df-reu 3368 df-rab 3415 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-iun 4956 df-br 5108 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5554 df-eprel 5559 df-po 5567 df-so 5568 df-fr 5612 df-we 5614 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7374 df-ov 7420 df-oprab 7421 df-mpo 7422 df-om 7867 df-2nd 7991 df-frecs 8284 df-wrecs 8315 df-recs 8364 df-rdg 8403 df-er 8700 df-en 8957 df-dom 8958 df-sdom 8959 df-sup 9416 df-pnf 11273 df-mnf 11274 df-xr 11275 df-ltxr 11276 df-le 11277 df-sub 11471 df-neg 11472 df-div 11900 df-nn 12262 df-2 12331 df-3 12332 df-n0 12533 df-z 12620 df-uz 12892 df-rp 13047 df-seq 14070 df-exp 14130 df-cj 15190 df-re 15191 df-im 15192 df-sqrt 15326 df-abs 15327 df-dvds 16349

This theorem is used by: gcdcllem3 16597

W3C validator