Theorem elnmz 19289

Description: Elementhood in the normalizer. (Contributed by Mario Carneiro, 18-Jan-2015.)

Hypothesis

Ref	Expression
elnmz.1	⊢ 𝑁 = {𝑥 ∈ 𝑋 ∣ ∀𝑦 ∈ 𝑋 ((𝑥 + 𝑦) ∈ 𝑆 ↔ (𝑦 + 𝑥) ∈ 𝑆)}

Assertion

Ref	Expression
elnmz	⊢ (𝐴 ∈ 𝑁 ↔ (𝐴 ∈ 𝑋 ∧ ∀𝑧 ∈ 𝑋 ((𝐴 + 𝑧) ∈ 𝑆 ↔ (𝑧 + 𝐴) ∈ 𝑆)))

Distinct variable groups:   𝑥,𝑧,𝐴   𝑥,𝑦,𝑧   𝑧,𝑁   𝑥,𝑆,𝑦,𝑧   𝑥, + ,𝑦,𝑧   𝑥,𝑋,𝑦,𝑧

Allowed substitution hints:   𝐴(𝑦)   𝑁(𝑥, 𝑦)

Proof of Theorem elnmz

Step	Hyp	Ref	Expression
1		oveq2 7422	. . . . . 6 ⊢ (𝑦 = 𝑧 → (𝑥 + 𝑦) = (𝑥 + 𝑧))
2	1	eleq1d 2845	. . . . 5 ⊢ (𝑦 = 𝑧 → ((𝑥 + 𝑦) ∈ 𝑆 ↔ (𝑥 + 𝑧) ∈ 𝑆))
3		oveq1 7421	. . . . . 6 ⊢ (𝑦 = 𝑧 → (𝑦 + 𝑥) = (𝑧 + 𝑥))
4	3	eleq1d 2845	. . . . 5 ⊢ (𝑦 = 𝑧 → ((𝑦 + 𝑥) ∈ 𝑆 ↔ (𝑧 + 𝑥) ∈ 𝑆))
5	2, 4	bibi12d 348	. . . 4 ⊢ (𝑦 = 𝑧 → (((𝑥 + 𝑦) ∈ 𝑆 ↔ (𝑦 + 𝑥) ∈ 𝑆) ↔ ((𝑥 + 𝑧) ∈ 𝑆 ↔ (𝑧 + 𝑥) ∈ 𝑆)))
6	5	cbvralvw 3240	. . 3 ⊢ (∀𝑦 ∈ 𝑋 ((𝑥 + 𝑦) ∈ 𝑆 ↔ (𝑦 + 𝑥) ∈ 𝑆) ↔ ∀𝑧 ∈ 𝑋 ((𝑥 + 𝑧) ∈ 𝑆 ↔ (𝑧 + 𝑥) ∈ 𝑆))
7		oveq1 7421	. . . . . 6 ⊢ (𝑥 = 𝐴 → (𝑥 + 𝑧) = (𝐴 + 𝑧))
8	7	eleq1d 2845	. . . . 5 ⊢ (𝑥 = 𝐴 → ((𝑥 + 𝑧) ∈ 𝑆 ↔ (𝐴 + 𝑧) ∈ 𝑆))
9		oveq2 7422	. . . . . 6 ⊢ (𝑥 = 𝐴 → (𝑧 + 𝑥) = (𝑧 + 𝐴))
10	9	eleq1d 2845	. . . . 5 ⊢ (𝑥 = 𝐴 → ((𝑧 + 𝑥) ∈ 𝑆 ↔ (𝑧 + 𝐴) ∈ 𝑆))
11	8, 10	bibi12d 348	. . . 4 ⊢ (𝑥 = 𝐴 → (((𝑥 + 𝑧) ∈ 𝑆 ↔ (𝑧 + 𝑥) ∈ 𝑆) ↔ ((𝐴 + 𝑧) ∈ 𝑆 ↔ (𝑧 + 𝐴) ∈ 𝑆)))
12	11	ralbidv 3185	. . 3 ⊢ (𝑥 = 𝐴 → (∀𝑧 ∈ 𝑋 ((𝑥 + 𝑧) ∈ 𝑆 ↔ (𝑧 + 𝑥) ∈ 𝑆) ↔ ∀𝑧 ∈ 𝑋 ((𝐴 + 𝑧) ∈ 𝑆 ↔ (𝑧 + 𝐴) ∈ 𝑆)))
13	6, 12	bitrid 286	. 2 ⊢ (𝑥 = 𝐴 → (∀𝑦 ∈ 𝑋 ((𝑥 + 𝑦) ∈ 𝑆 ↔ (𝑦 + 𝑥) ∈ 𝑆) ↔ ∀𝑧 ∈ 𝑋 ((𝐴 + 𝑧) ∈ 𝑆 ↔ (𝑧 + 𝐴) ∈ 𝑆)))
14		elnmz.1	. 2 ⊢ 𝑁 = {𝑥 ∈ 𝑋 ∣ ∀𝑦 ∈ 𝑋 ((𝑥 + 𝑦) ∈ 𝑆 ↔ (𝑦 + 𝑥) ∈ 𝑆)}
15	13, 14	elrab2 3649	1 ⊢ (𝐴 ∈ 𝑁 ↔ (𝐴 ∈ 𝑋 ∧ ∀𝑧 ∈ 𝑋 ((𝐴 + 𝑧) ∈ 𝑆 ↔ (𝑧 + 𝐴) ∈ 𝑆)))

This proof depends on syntax axioms:   ↔ wb 209   ∧ wa 401   = wceq 1570   ∈ wcel 2145  ∀wral 3076  {crab 3412  (class class class)co 7414

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-ext 2732

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-clab 2739  df-cleq 2752  df-clel 2835  df-ral 3077  df-rab 3413  df-v 3452  df-dif 3902  df-un 3904  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-iota 6489  df-fv 6541  df-ov 7417

This theorem is used by:  nmzbi  19290  nmzsubg  19291  ssnmz  19292  conjnmzb  19383  sylow3lem2  19758