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Theorem lbsextlem3 20772

Description: Lemma for lbsext 20775. A chain in 𝑆 has an upper bound in 𝑆. (Contributed by Mario Carneiro, 25-Jun-2014.)

**Hypotheses**
Ref	Expression
lbsext.v	⊢ 𝑉 = (Base‘𝑊)
lbsext.j	⊢ 𝐽 = (LBasis‘𝑊)
lbsext.n	⊢ 𝑁 = (LSpan‘𝑊)
lbsext.w	⊢ (𝜑 → 𝑊 ∈ LVec)
lbsext.c	⊢ (𝜑 → 𝐶 ⊆ 𝑉)
lbsext.x	⊢ (𝜑 → ∀𝑥 ∈ 𝐶 ¬ 𝑥 ∈ (𝑁‘(𝐶 ∖ {𝑥})))
lbsext.s	⊢ 𝑆 = {𝑧 ∈ 𝒫 𝑉 ∣ (𝐶 ⊆ 𝑧 ∧ ∀𝑥 ∈ 𝑧 ¬ 𝑥 ∈ (𝑁‘(𝑧 ∖ {𝑥})))}
lbsext.p	⊢ 𝑃 = (LSubSp‘𝑊)
lbsext.a	⊢ (𝜑 → 𝐴 ⊆ 𝑆)
lbsext.z	⊢ (𝜑 → 𝐴 ≠ ∅)
lbsext.r	⊢ (𝜑 → [⊊] Or 𝐴)
lbsext.t	⊢ 𝑇 = ∪ 𝑢 ∈ 𝐴 (𝑁‘(𝑢 ∖ {𝑥}))

**Assertion**
Ref	Expression
lbsextlem3	⊢ (𝜑 → ∪ 𝐴 ∈ 𝑆)

Distinct variable groups: 𝑥,𝐽 𝑥,𝑢,𝜑 𝑢,𝑆,𝑥 𝑥,𝑧,𝐶 𝑧,𝑢,𝑁,𝑥 𝑢,𝑉,𝑥,𝑧 𝑢,𝑊,𝑥 𝑢,𝐴,𝑥,𝑧 Allowed substitution hints: 𝜑(𝑧) 𝐶(𝑢) 𝑃(𝑥,𝑧,𝑢) 𝑆(𝑧) 𝑇(𝑥,𝑧,𝑢) 𝐽(𝑧,𝑢) 𝑊(𝑧)

Proof of Theorem lbsextlem3 Dummy variable 𝑦 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		lbsext.a	. . . . 5 ⊢ (𝜑 → 𝐴 ⊆ 𝑆)
2		lbsext.s	. . . . . 6 ⊢ 𝑆 = {𝑧 ∈ 𝒫 𝑉 ∣ (𝐶 ⊆ 𝑧 ∧ ∀𝑥 ∈ 𝑧 ¬ 𝑥 ∈ (𝑁‘(𝑧 ∖ {𝑥})))}
3	2	ssrab3 4080	. . . . 5 ⊢ 𝑆 ⊆ 𝒫 𝑉
4	1, 3	sstrdi 3994	. . . 4 ⊢ (𝜑 → 𝐴 ⊆ 𝒫 𝑉)
5		sspwuni 5103	. . . 4 ⊢ (𝐴 ⊆ 𝒫 𝑉 ↔ ∪ 𝐴 ⊆ 𝑉)
6	4, 5	sylib 217	. . 3 ⊢ (𝜑 → ∪ 𝐴 ⊆ 𝑉)
7		lbsext.v	. . . . 5 ⊢ 𝑉 = (Base‘𝑊)
8	7	fvexi 6905	. . . 4 ⊢ 𝑉 ∈ V
9	8	elpw2 5345	. . 3 ⊢ (∪ 𝐴 ∈ 𝒫 𝑉 ↔ ∪ 𝐴 ⊆ 𝑉)
10	6, 9	sylibr 233	. 2 ⊢ (𝜑 → ∪ 𝐴 ∈ 𝒫 𝑉)
11		ssintub 4970	. . . . 5 ⊢ 𝐶 ⊆ ∩ {𝑧 ∈ 𝒫 𝑉 ∣ 𝐶 ⊆ 𝑧}
12		simpl 483	. . . . . . . . . 10 ⊢ ((𝐶 ⊆ 𝑧 ∧ ∀𝑥 ∈ 𝑧 ¬ 𝑥 ∈ (𝑁‘(𝑧 ∖ {𝑥}))) → 𝐶 ⊆ 𝑧)
13	12	a1i 11	. . . . . . . . 9 ⊢ (𝑧 ∈ 𝒫 𝑉 → ((𝐶 ⊆ 𝑧 ∧ ∀𝑥 ∈ 𝑧 ¬ 𝑥 ∈ (𝑁‘(𝑧 ∖ {𝑥}))) → 𝐶 ⊆ 𝑧))
14	13	ss2rabi 4074	. . . . . . . 8 ⊢ {𝑧 ∈ 𝒫 𝑉 ∣ (𝐶 ⊆ 𝑧 ∧ ∀𝑥 ∈ 𝑧 ¬ 𝑥 ∈ (𝑁‘(𝑧 ∖ {𝑥})))} ⊆ {𝑧 ∈ 𝒫 𝑉 ∣ 𝐶 ⊆ 𝑧}
15	2, 14	eqsstri 4016	. . . . . . 7 ⊢ 𝑆 ⊆ {𝑧 ∈ 𝒫 𝑉 ∣ 𝐶 ⊆ 𝑧}
16	1, 15	sstrdi 3994	. . . . . 6 ⊢ (𝜑 → 𝐴 ⊆ {𝑧 ∈ 𝒫 𝑉 ∣ 𝐶 ⊆ 𝑧})
17		intss 4973	. . . . . 6 ⊢ (𝐴 ⊆ {𝑧 ∈ 𝒫 𝑉 ∣ 𝐶 ⊆ 𝑧} → ∩ {𝑧 ∈ 𝒫 𝑉 ∣ 𝐶 ⊆ 𝑧} ⊆ ∩ 𝐴)
18	16, 17	syl 17	. . . . 5 ⊢ (𝜑 → ∩ {𝑧 ∈ 𝒫 𝑉 ∣ 𝐶 ⊆ 𝑧} ⊆ ∩ 𝐴)
19	11, 18	sstrid 3993	. . . 4 ⊢ (𝜑 → 𝐶 ⊆ ∩ 𝐴)
20		lbsext.z	. . . . 5 ⊢ (𝜑 → 𝐴 ≠ ∅)
21		intssuni 4974	. . . . 5 ⊢ (𝐴 ≠ ∅ → ∩ 𝐴 ⊆ ∪ 𝐴)
22	20, 21	syl 17	. . . 4 ⊢ (𝜑 → ∩ 𝐴 ⊆ ∪ 𝐴)
23	19, 22	sstrd 3992	. . 3 ⊢ (𝜑 → 𝐶 ⊆ ∪ 𝐴)
24		eluni2 4912	. . . . 5 ⊢ (𝑥 ∈ ∪ 𝐴 ↔ ∃𝑦 ∈ 𝐴 𝑥 ∈ 𝑦)
25		simpll1 1212	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → 𝜑)
26		lbsext.w	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑊 ∈ LVec)
27		lveclmod 20716	. . . . . . . . . . . . 13 ⊢ (𝑊 ∈ LVec → 𝑊 ∈ LMod)
28	26, 27	syl 17	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑊 ∈ LMod)
29	25, 28	syl 17	. . . . . . . . . . 11 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → 𝑊 ∈ LMod)
30	25, 1	syl 17	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → 𝐴 ⊆ 𝑆)
31		lbsext.r	. . . . . . . . . . . . . . . . 17 ⊢ (𝜑 → [⊊] Or 𝐴)
32	25, 31	syl 17	. . . . . . . . . . . . . . . 16 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → [⊊] Or 𝐴)
33		simpll2 1213	. . . . . . . . . . . . . . . 16 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → 𝑦 ∈ 𝐴)
34		simplr 767	. . . . . . . . . . . . . . . 16 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → 𝑢 ∈ 𝐴)
35		sorpssun 7719	. . . . . . . . . . . . . . . 16 ⊢ (( [⊊] Or 𝐴 ∧ (𝑦 ∈ 𝐴 ∧ 𝑢 ∈ 𝐴)) → (𝑦 ∪ 𝑢) ∈ 𝐴)
36	32, 33, 34, 35	syl12anc 835	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → (𝑦 ∪ 𝑢) ∈ 𝐴)
37	30, 36	sseldd 3983	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → (𝑦 ∪ 𝑢) ∈ 𝑆)
38	3, 37	sselid 3980	. . . . . . . . . . . . 13 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → (𝑦 ∪ 𝑢) ∈ 𝒫 𝑉)
39	38	elpwid 4611	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → (𝑦 ∪ 𝑢) ⊆ 𝑉)
40	39	ssdifssd 4142	. . . . . . . . . . 11 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → ((𝑦 ∪ 𝑢) ∖ {𝑥}) ⊆ 𝑉)
41		ssun2 4173	. . . . . . . . . . . 12 ⊢ 𝑢 ⊆ (𝑦 ∪ 𝑢)
42		ssdif 4139	. . . . . . . . . . . 12 ⊢ (𝑢 ⊆ (𝑦 ∪ 𝑢) → (𝑢 ∖ {𝑥}) ⊆ ((𝑦 ∪ 𝑢) ∖ {𝑥}))
43	41, 42	mp1i 13	. . . . . . . . . . 11 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → (𝑢 ∖ {𝑥}) ⊆ ((𝑦 ∪ 𝑢) ∖ {𝑥}))
44		lbsext.n	. . . . . . . . . . . 12 ⊢ 𝑁 = (LSpan‘𝑊)
45	7, 44	lspss 20594	. . . . . . . . . . 11 ⊢ ((𝑊 ∈ LMod ∧ ((𝑦 ∪ 𝑢) ∖ {𝑥}) ⊆ 𝑉 ∧ (𝑢 ∖ {𝑥}) ⊆ ((𝑦 ∪ 𝑢) ∖ {𝑥})) → (𝑁‘(𝑢 ∖ {𝑥})) ⊆ (𝑁‘((𝑦 ∪ 𝑢) ∖ {𝑥})))
46	29, 40, 43, 45	syl3anc 1371	. . . . . . . . . 10 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → (𝑁‘(𝑢 ∖ {𝑥})) ⊆ (𝑁‘((𝑦 ∪ 𝑢) ∖ {𝑥})))
47		simpr 485	. . . . . . . . . 10 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥})))
48	46, 47	sseldd 3983	. . . . . . . . 9 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → 𝑥 ∈ (𝑁‘((𝑦 ∪ 𝑢) ∖ {𝑥})))
49		sseq2 4008	. . . . . . . . . . . . . . 15 ⊢ (𝑧 = (𝑦 ∪ 𝑢) → (𝐶 ⊆ 𝑧 ↔ 𝐶 ⊆ (𝑦 ∪ 𝑢)))
50		difeq1 4115	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑧 = (𝑦 ∪ 𝑢) → (𝑧 ∖ {𝑥}) = ((𝑦 ∪ 𝑢) ∖ {𝑥}))
51	50	fveq2d 6895	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑧 = (𝑦 ∪ 𝑢) → (𝑁‘(𝑧 ∖ {𝑥})) = (𝑁‘((𝑦 ∪ 𝑢) ∖ {𝑥})))
52	51	eleq2d 2819	. . . . . . . . . . . . . . . . 17 ⊢ (𝑧 = (𝑦 ∪ 𝑢) → (𝑥 ∈ (𝑁‘(𝑧 ∖ {𝑥})) ↔ 𝑥 ∈ (𝑁‘((𝑦 ∪ 𝑢) ∖ {𝑥}))))
53	52	notbid 317	. . . . . . . . . . . . . . . 16 ⊢ (𝑧 = (𝑦 ∪ 𝑢) → (¬ 𝑥 ∈ (𝑁‘(𝑧 ∖ {𝑥})) ↔ ¬ 𝑥 ∈ (𝑁‘((𝑦 ∪ 𝑢) ∖ {𝑥}))))
54	53	raleqbi1dv 3333	. . . . . . . . . . . . . . 15 ⊢ (𝑧 = (𝑦 ∪ 𝑢) → (∀𝑥 ∈ 𝑧 ¬ 𝑥 ∈ (𝑁‘(𝑧 ∖ {𝑥})) ↔ ∀𝑥 ∈ (𝑦 ∪ 𝑢) ¬ 𝑥 ∈ (𝑁‘((𝑦 ∪ 𝑢) ∖ {𝑥}))))
55	49, 54	anbi12d 631	. . . . . . . . . . . . . 14 ⊢ (𝑧 = (𝑦 ∪ 𝑢) → ((𝐶 ⊆ 𝑧 ∧ ∀𝑥 ∈ 𝑧 ¬ 𝑥 ∈ (𝑁‘(𝑧 ∖ {𝑥}))) ↔ (𝐶 ⊆ (𝑦 ∪ 𝑢) ∧ ∀𝑥 ∈ (𝑦 ∪ 𝑢) ¬ 𝑥 ∈ (𝑁‘((𝑦 ∪ 𝑢) ∖ {𝑥})))))
56	55, 2	elrab2 3686	. . . . . . . . . . . . 13 ⊢ ((𝑦 ∪ 𝑢) ∈ 𝑆 ↔ ((𝑦 ∪ 𝑢) ∈ 𝒫 𝑉 ∧ (𝐶 ⊆ (𝑦 ∪ 𝑢) ∧ ∀𝑥 ∈ (𝑦 ∪ 𝑢) ¬ 𝑥 ∈ (𝑁‘((𝑦 ∪ 𝑢) ∖ {𝑥})))))
57	56	simprbi 497	. . . . . . . . . . . 12 ⊢ ((𝑦 ∪ 𝑢) ∈ 𝑆 → (𝐶 ⊆ (𝑦 ∪ 𝑢) ∧ ∀𝑥 ∈ (𝑦 ∪ 𝑢) ¬ 𝑥 ∈ (𝑁‘((𝑦 ∪ 𝑢) ∖ {𝑥}))))
58	57	simprd 496	. . . . . . . . . . 11 ⊢ ((𝑦 ∪ 𝑢) ∈ 𝑆 → ∀𝑥 ∈ (𝑦 ∪ 𝑢) ¬ 𝑥 ∈ (𝑁‘((𝑦 ∪ 𝑢) ∖ {𝑥})))
59	37, 58	syl 17	. . . . . . . . . 10 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → ∀𝑥 ∈ (𝑦 ∪ 𝑢) ¬ 𝑥 ∈ (𝑁‘((𝑦 ∪ 𝑢) ∖ {𝑥})))
60		simpll3 1214	. . . . . . . . . . 11 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → 𝑥 ∈ 𝑦)
61		elun1 4176	. . . . . . . . . . 11 ⊢ (𝑥 ∈ 𝑦 → 𝑥 ∈ (𝑦 ∪ 𝑢))
62	60, 61	syl 17	. . . . . . . . . 10 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → 𝑥 ∈ (𝑦 ∪ 𝑢))
63		rsp 3244	. . . . . . . . . 10 ⊢ (∀𝑥 ∈ (𝑦 ∪ 𝑢) ¬ 𝑥 ∈ (𝑁‘((𝑦 ∪ 𝑢) ∖ {𝑥})) → (𝑥 ∈ (𝑦 ∪ 𝑢) → ¬ 𝑥 ∈ (𝑁‘((𝑦 ∪ 𝑢) ∖ {𝑥}))))
64	59, 62, 63	sylc 65	. . . . . . . . 9 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → ¬ 𝑥 ∈ (𝑁‘((𝑦 ∪ 𝑢) ∖ {𝑥})))
65	48, 64	pm2.65da 815	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) → ¬ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥})))
66	65	nrexdv 3149	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) → ¬ ∃𝑢 ∈ 𝐴 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥})))
67		lbsext.j	. . . . . . . . . . . . . . . 16 ⊢ 𝐽 = (LBasis‘𝑊)
68		lbsext.c	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → 𝐶 ⊆ 𝑉)
69		lbsext.x	. . . . . . . . . . . . . . . 16 ⊢ (𝜑 → ∀𝑥 ∈ 𝐶 ¬ 𝑥 ∈ (𝑁‘(𝐶 ∖ {𝑥})))
70		lbsext.p	. . . . . . . . . . . . . . . 16 ⊢ 𝑃 = (LSubSp‘𝑊)
71		lbsext.t	. . . . . . . . . . . . . . . 16 ⊢ 𝑇 = ∪ 𝑢 ∈ 𝐴 (𝑁‘(𝑢 ∖ {𝑥}))
72	7, 67, 44, 26, 68, 69, 2, 70, 1, 20, 31, 71	lbsextlem2 20771	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → (𝑇 ∈ 𝑃 ∧ (∪ 𝐴 ∖ {𝑥}) ⊆ 𝑇))
73	72	simpld 495	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝑇 ∈ 𝑃)
74	7, 70	lssss 20546	. . . . . . . . . . . . . 14 ⊢ (𝑇 ∈ 𝑃 → 𝑇 ⊆ 𝑉)
75	73, 74	syl 17	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑇 ⊆ 𝑉)
76	72	simprd 496	. . . . . . . . . . . . 13 ⊢ (𝜑 → (∪ 𝐴 ∖ {𝑥}) ⊆ 𝑇)
77	7, 44	lspss 20594	. . . . . . . . . . . . 13 ⊢ ((𝑊 ∈ LMod ∧ 𝑇 ⊆ 𝑉 ∧ (∪ 𝐴 ∖ {𝑥}) ⊆ 𝑇) → (𝑁‘(∪ 𝐴 ∖ {𝑥})) ⊆ (𝑁‘𝑇))
78	28, 75, 76, 77	syl3anc 1371	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝑁‘(∪ 𝐴 ∖ {𝑥})) ⊆ (𝑁‘𝑇))
79	70, 44	lspid 20592	. . . . . . . . . . . . 13 ⊢ ((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑃) → (𝑁‘𝑇) = 𝑇)
80	28, 73, 79	syl2anc 584	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝑁‘𝑇) = 𝑇)
81	78, 80	sseqtrd 4022	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑁‘(∪ 𝐴 ∖ {𝑥})) ⊆ 𝑇)
82	81	3ad2ant1 1133	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) → (𝑁‘(∪ 𝐴 ∖ {𝑥})) ⊆ 𝑇)
83	82, 71	sseqtrdi 4032	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) → (𝑁‘(∪ 𝐴 ∖ {𝑥})) ⊆ ∪ 𝑢 ∈ 𝐴 (𝑁‘(𝑢 ∖ {𝑥})))
84	83	sseld 3981	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) → (𝑥 ∈ (𝑁‘(∪ 𝐴 ∖ {𝑥})) → 𝑥 ∈ ∪ 𝑢 ∈ 𝐴 (𝑁‘(𝑢 ∖ {𝑥}))))
85		eliun 5001	. . . . . . . 8 ⊢ (𝑥 ∈ ∪ 𝑢 ∈ 𝐴 (𝑁‘(𝑢 ∖ {𝑥})) ↔ ∃𝑢 ∈ 𝐴 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥})))
86	84, 85	imbitrdi 250	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) → (𝑥 ∈ (𝑁‘(∪ 𝐴 ∖ {𝑥})) → ∃𝑢 ∈ 𝐴 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))))
87	66, 86	mtod 197	. . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) → ¬ 𝑥 ∈ (𝑁‘(∪ 𝐴 ∖ {𝑥})))
88	87	rexlimdv3a 3159	. . . . 5 ⊢ (𝜑 → (∃𝑦 ∈ 𝐴 𝑥 ∈ 𝑦 → ¬ 𝑥 ∈ (𝑁‘(∪ 𝐴 ∖ {𝑥}))))
89	24, 88	biimtrid 241	. . . 4 ⊢ (𝜑 → (𝑥 ∈ ∪ 𝐴 → ¬ 𝑥 ∈ (𝑁‘(∪ 𝐴 ∖ {𝑥}))))
90	89	ralrimiv 3145	. . 3 ⊢ (𝜑 → ∀𝑥 ∈ ∪ 𝐴 ¬ 𝑥 ∈ (𝑁‘(∪ 𝐴 ∖ {𝑥})))
91	23, 90	jca 512	. 2 ⊢ (𝜑 → (𝐶 ⊆ ∪ 𝐴 ∧ ∀𝑥 ∈ ∪ 𝐴 ¬ 𝑥 ∈ (𝑁‘(∪ 𝐴 ∖ {𝑥}))))
92		sseq2 4008	. . . 4 ⊢ (𝑧 = ∪ 𝐴 → (𝐶 ⊆ 𝑧 ↔ 𝐶 ⊆ ∪ 𝐴))
93		difeq1 4115	. . . . . . . 8 ⊢ (𝑧 = ∪ 𝐴 → (𝑧 ∖ {𝑥}) = (∪ 𝐴 ∖ {𝑥}))
94	93	fveq2d 6895	. . . . . . 7 ⊢ (𝑧 = ∪ 𝐴 → (𝑁‘(𝑧 ∖ {𝑥})) = (𝑁‘(∪ 𝐴 ∖ {𝑥})))
95	94	eleq2d 2819	. . . . . 6 ⊢ (𝑧 = ∪ 𝐴 → (𝑥 ∈ (𝑁‘(𝑧 ∖ {𝑥})) ↔ 𝑥 ∈ (𝑁‘(∪ 𝐴 ∖ {𝑥}))))
96	95	notbid 317	. . . . 5 ⊢ (𝑧 = ∪ 𝐴 → (¬ 𝑥 ∈ (𝑁‘(𝑧 ∖ {𝑥})) ↔ ¬ 𝑥 ∈ (𝑁‘(∪ 𝐴 ∖ {𝑥}))))
97	96	raleqbi1dv 3333	. . . 4 ⊢ (𝑧 = ∪ 𝐴 → (∀𝑥 ∈ 𝑧 ¬ 𝑥 ∈ (𝑁‘(𝑧 ∖ {𝑥})) ↔ ∀𝑥 ∈ ∪ 𝐴 ¬ 𝑥 ∈ (𝑁‘(∪ 𝐴 ∖ {𝑥}))))
98	92, 97	anbi12d 631	. . 3 ⊢ (𝑧 = ∪ 𝐴 → ((𝐶 ⊆ 𝑧 ∧ ∀𝑥 ∈ 𝑧 ¬ 𝑥 ∈ (𝑁‘(𝑧 ∖ {𝑥}))) ↔ (𝐶 ⊆ ∪ 𝐴 ∧ ∀𝑥 ∈ ∪ 𝐴 ¬ 𝑥 ∈ (𝑁‘(∪ 𝐴 ∖ {𝑥})))))
99	98, 2	elrab2 3686	. 2 ⊢ (∪ 𝐴 ∈ 𝑆 ↔ (∪ 𝐴 ∈ 𝒫 𝑉 ∧ (𝐶 ⊆ ∪ 𝐴 ∧ ∀𝑥 ∈ ∪ 𝐴 ¬ 𝑥 ∈ (𝑁‘(∪ 𝐴 ∖ {𝑥})))))
100	10, 91, 99	sylanbrc 583	1 ⊢ (𝜑 → ∪ 𝐴 ∈ 𝑆)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 396 ∧ w3a 1087 = wceq 1541 ∈ wcel 2106 ≠ wne 2940 ∀wral 3061 ∃wrex 3070 {crab 3432 ∖ cdif 3945 ∪ cun 3946 ⊆ wss 3948 ∅c0 4322 𝒫 cpw 4602 {csn 4628 ∪ cuni 4908 ∩ cint 4950 ∪ ciun 4997 Or wor 5587 ‘cfv 6543 [⊊] crpss 7711 Basecbs 17143 LModclmod 20470 LSubSpclss 20541 LSpanclspn 20581 LBasisclbs 20684 LVecclvec 20712

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7724 ax-cnex 11165 ax-resscn 11166 ax-1cn 11167 ax-icn 11168 ax-addcl 11169 ax-addrcl 11170 ax-mulcl 11171 ax-mulrcl 11172 ax-mulcom 11173 ax-addass 11174 ax-mulass 11175 ax-distr 11176 ax-i2m1 11177 ax-1ne0 11178 ax-1rid 11179 ax-rnegex 11180 ax-rrecex 11181 ax-cnre 11182 ax-pre-lttri 11183 ax-pre-lttrn 11184 ax-pre-ltadd 11185 ax-pre-mulgt0 11186

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-int 4951 df-iun 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7364 df-ov 7411 df-oprab 7412 df-mpo 7413 df-rpss 7712 df-om 7855 df-1st 7974 df-2nd 7975 df-frecs 8265 df-wrecs 8296 df-recs 8370 df-rdg 8409 df-er 8702 df-en 8939 df-dom 8940 df-sdom 8941 df-pnf 11249 df-mnf 11250 df-xr 11251 df-ltxr 11252 df-le 11253 df-sub 11445 df-neg 11446 df-nn 12212 df-2 12274 df-sets 17096 df-slot 17114 df-ndx 17126 df-base 17144 df-plusg 17209 df-0g 17386 df-mgm 18560 df-sgrp 18609 df-mnd 18625 df-grp 18821 df-minusg 18822 df-sbg 18823 df-mgp 19987 df-ur 20004 df-ring 20057 df-lmod 20472 df-lss 20542 df-lsp 20582 df-lvec 20713

This theorem is referenced by: lbsextlem4 20773

W3C validator