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Theorem lbsextlem3 21055

Description: Lemma for lbsext 21058. 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 5107	. . . 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 6916	. . . 4 ⊢ 𝑉 ∈ V
9	8	elpw2 5351	. . 3 ⊢ (∪ 𝐴 ∈ 𝒫 𝑉 ↔ ∪ 𝐴 ⊆ 𝑉)
10	6, 9	sylibr 233	. 2 ⊢ (𝜑 → ∪ 𝐴 ∈ 𝒫 𝑉)
11		ssintub 4973	. . . . 5 ⊢ 𝐶 ⊆ ∩ {𝑧 ∈ 𝒫 𝑉 ∣ 𝐶 ⊆ 𝑧}
12		simpl 481	. . . . . . . . . 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 4976	. . . . . 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 4977	. . . . 5 ⊢ (𝐴 ≠ ∅ → ∩ 𝐴 ⊆ ∪ 𝐴)
22	20, 21	syl 17	. . . 4 ⊢ (𝜑 → ∩ 𝐴 ⊆ ∪ 𝐴)
23	19, 22	sstrd 3992	. . 3 ⊢ (𝜑 → 𝐶 ⊆ ∪ 𝐴)
24		eluni2 4916	. . . . 5 ⊢ (𝑥 ∈ ∪ 𝐴 ↔ ∃𝑦 ∈ 𝐴 𝑥 ∈ 𝑦)
25		simpll1 1209	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → 𝜑)
26		lbsext.w	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑊 ∈ LVec)
27		lveclmod 20998	. . . . . . . . . . . . 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 1210	. . . . . . . . . . . . . . . 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 7741	. . . . . . . . . . . . . . . 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 4615	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → (𝑦 ∪ 𝑢) ⊆ 𝑉)
40	39	ssdifssd 4143	. . . . . . . . . . 11 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → ((𝑦 ∪ 𝑢) ∖ {𝑥}) ⊆ 𝑉)
41		ssun2 4175	. . . . . . . . . . . 12 ⊢ 𝑢 ⊆ (𝑦 ∪ 𝑢)
42		ssdif 4140	. . . . . . . . . . . 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 20875	. . . . . . . . . . 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 1368	. . . . . . . . . 10 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → (𝑁‘(𝑢 ∖ {𝑥})) ⊆ (𝑁‘((𝑦 ∪ 𝑢) ∖ {𝑥})))
47		simpr 483	. . . . . . . . . 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 6906	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑧 = (𝑦 ∪ 𝑢) → (𝑁‘(𝑧 ∖ {𝑥})) = (𝑁‘((𝑦 ∪ 𝑢) ∖ {𝑥})))
52	51	eleq2d 2815	. . . . . . . . . . . . . . . . 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 3331	. . . . . . . . . . . . . . 15 ⊢ (𝑧 = (𝑦 ∪ 𝑢) → (∀𝑥 ∈ 𝑧 ¬ 𝑥 ∈ (𝑁‘(𝑧 ∖ {𝑥})) ↔ ∀𝑥 ∈ (𝑦 ∪ 𝑢) ¬ 𝑥 ∈ (𝑁‘((𝑦 ∪ 𝑢) ∖ {𝑥}))))
55	49, 54	anbi12d 630	. . . . . . . . . . . . . 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 3687	. . . . . . . . . . . . 13 ⊢ ((𝑦 ∪ 𝑢) ∈ 𝑆 ↔ ((𝑦 ∪ 𝑢) ∈ 𝒫 𝑉 ∧ (𝐶 ⊆ (𝑦 ∪ 𝑢) ∧ ∀𝑥 ∈ (𝑦 ∪ 𝑢) ¬ 𝑥 ∈ (𝑁‘((𝑦 ∪ 𝑢) ∖ {𝑥})))))
57	56	simprbi 495	. . . . . . . . . . . 12 ⊢ ((𝑦 ∪ 𝑢) ∈ 𝑆 → (𝐶 ⊆ (𝑦 ∪ 𝑢) ∧ ∀𝑥 ∈ (𝑦 ∪ 𝑢) ¬ 𝑥 ∈ (𝑁‘((𝑦 ∪ 𝑢) ∖ {𝑥}))))
58	57	simprd 494	. . . . . . . . . . 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 1211	. . . . . . . . . . 11 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑥 ∈ 𝑦) ∧ 𝑢 ∈ 𝐴) ∧ 𝑥 ∈ (𝑁‘(𝑢 ∖ {𝑥}))) → 𝑥 ∈ 𝑦)
61		elun1 4178	. . . . . . . . . . 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 3242	. . . . . . . . . 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 3146	. . . . . . 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 21054	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → (𝑇 ∈ 𝑃 ∧ (∪ 𝐴 ∖ {𝑥}) ⊆ 𝑇))
73	72	simpld 493	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝑇 ∈ 𝑃)
74	7, 70	lssss 20827	. . . . . . . . . . . . . 14 ⊢ (𝑇 ∈ 𝑃 → 𝑇 ⊆ 𝑉)
75	73, 74	syl 17	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑇 ⊆ 𝑉)
76	72	simprd 494	. . . . . . . . . . . . 13 ⊢ (𝜑 → (∪ 𝐴 ∖ {𝑥}) ⊆ 𝑇)
77	7, 44	lspss 20875	. . . . . . . . . . . . 13 ⊢ ((𝑊 ∈ LMod ∧ 𝑇 ⊆ 𝑉 ∧ (∪ 𝐴 ∖ {𝑥}) ⊆ 𝑇) → (𝑁‘(∪ 𝐴 ∖ {𝑥})) ⊆ (𝑁‘𝑇))
78	28, 75, 76, 77	syl3anc 1368	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝑁‘(∪ 𝐴 ∖ {𝑥})) ⊆ (𝑁‘𝑇))
79	70, 44	lspid 20873	. . . . . . . . . . . . 13 ⊢ ((𝑊 ∈ LMod ∧ 𝑇 ∈ 𝑃) → (𝑁‘𝑇) = 𝑇)
80	28, 73, 79	syl2anc 582	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝑁‘𝑇) = 𝑇)
81	78, 80	sseqtrd 4022	. . . . . . . . . . 11 ⊢ (𝜑 → (𝑁‘(∪ 𝐴 ∖ {𝑥})) ⊆ 𝑇)
82	81	3ad2ant1 1130	. . . . . . . . . 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 5004	. . . . . . . 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 3156	. . . . 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 3142	. . 3 ⊢ (𝜑 → ∀𝑥 ∈ ∪ 𝐴 ¬ 𝑥 ∈ (𝑁‘(∪ 𝐴 ∖ {𝑥})))
91	23, 90	jca 510	. 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 6906	. . . . . . 7 ⊢ (𝑧 = ∪ 𝐴 → (𝑁‘(𝑧 ∖ {𝑥})) = (𝑁‘(∪ 𝐴 ∖ {𝑥})))
95	94	eleq2d 2815	. . . . . 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 3331	. . . 4 ⊢ (𝑧 = ∪ 𝐴 → (∀𝑥 ∈ 𝑧 ¬ 𝑥 ∈ (𝑁‘(𝑧 ∖ {𝑥})) ↔ ∀𝑥 ∈ ∪ 𝐴 ¬ 𝑥 ∈ (𝑁‘(∪ 𝐴 ∖ {𝑥}))))
98	92, 97	anbi12d 630	. . 3 ⊢ (𝑧 = ∪ 𝐴 → ((𝐶 ⊆ 𝑧 ∧ ∀𝑥 ∈ 𝑧 ¬ 𝑥 ∈ (𝑁‘(𝑧 ∖ {𝑥}))) ↔ (𝐶 ⊆ ∪ 𝐴 ∧ ∀𝑥 ∈ ∪ 𝐴 ¬ 𝑥 ∈ (𝑁‘(∪ 𝐴 ∖ {𝑥})))))
99	98, 2	elrab2 3687	. 2 ⊢ (∪ 𝐴 ∈ 𝑆 ↔ (∪ 𝐴 ∈ 𝒫 𝑉 ∧ (𝐶 ⊆ ∪ 𝐴 ∧ ∀𝑥 ∈ ∪ 𝐴 ¬ 𝑥 ∈ (𝑁‘(∪ 𝐴 ∖ {𝑥})))))
100	10, 91, 99	sylanbrc 581	1 ⊢ (𝜑 → ∪ 𝐴 ∈ 𝑆)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 394 ∧ w3a 1084 = wceq 1533 ∈ wcel 2098 ≠ wne 2937 ∀wral 3058 ∃wrex 3067 {crab 3430 ∖ cdif 3946 ∪ cun 3947 ⊆ wss 3949 ∅c0 4326 𝒫 cpw 4606 {csn 4632 ∪ cuni 4912 ∩ cint 4953 ∪ ciun 5000 Or wor 5593 ‘cfv 6553 [⊊] crpss 7733 Basecbs 17187 LModclmod 20750 LSubSpclss 20822 LSpanclspn 20862 LBasisclbs 20966 LVecclvec 20994

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2699 ax-rep 5289 ax-sep 5303 ax-nul 5310 ax-pow 5369 ax-pr 5433 ax-un 7746 ax-cnex 11202 ax-resscn 11203 ax-1cn 11204 ax-icn 11205 ax-addcl 11206 ax-addrcl 11207 ax-mulcl 11208 ax-mulrcl 11209 ax-mulcom 11210 ax-addass 11211 ax-mulass 11212 ax-distr 11213 ax-i2m1 11214 ax-1ne0 11215 ax-1rid 11216 ax-rnegex 11217 ax-rrecex 11218 ax-cnre 11219 ax-pre-lttri 11220 ax-pre-lttrn 11221 ax-pre-ltadd 11222 ax-pre-mulgt0 11223

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2529 df-eu 2558 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rmo 3374 df-reu 3375 df-rab 3431 df-v 3475 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4327 df-if 4533 df-pw 4608 df-sn 4633 df-pr 4635 df-op 4639 df-uni 4913 df-int 4954 df-iun 5002 df-br 5153 df-opab 5215 df-mpt 5236 df-tr 5270 df-id 5580 df-eprel 5586 df-po 5594 df-so 5595 df-fr 5637 df-we 5639 df-xp 5688 df-rel 5689 df-cnv 5690 df-co 5691 df-dm 5692 df-rn 5693 df-res 5694 df-ima 5695 df-pred 6310 df-ord 6377 df-on 6378 df-lim 6379 df-suc 6380 df-iota 6505 df-fun 6555 df-fn 6556 df-f 6557 df-f1 6558 df-fo 6559 df-f1o 6560 df-fv 6561 df-riota 7382 df-ov 7429 df-oprab 7430 df-mpo 7431 df-rpss 7734 df-om 7877 df-1st 7999 df-2nd 8000 df-frecs 8293 df-wrecs 8324 df-recs 8398 df-rdg 8437 df-er 8731 df-en 8971 df-dom 8972 df-sdom 8973 df-pnf 11288 df-mnf 11289 df-xr 11290 df-ltxr 11291 df-le 11292 df-sub 11484 df-neg 11485 df-nn 12251 df-2 12313 df-sets 17140 df-slot 17158 df-ndx 17170 df-base 17188 df-plusg 17253 df-0g 17430 df-mgm 18607 df-sgrp 18686 df-mnd 18702 df-grp 18900 df-minusg 18901 df-sbg 18902 df-mgp 20082 df-ur 20129 df-ring 20182 df-lmod 20752 df-lss 20823 df-lsp 20863 df-lvec 20995

This theorem is referenced by: lbsextlem4 21056

W3C validator