Theorem ressbasOLD 16874

Description: Obsolete proof of ressbas 16873 as of 7-Nov-2024. Base set of a structure restriction. (Contributed by Stefan O'Rear, 26-Nov-2014.) (New usage is discouraged.) (Proof modification is discouraged.)

Hypotheses

Ref	Expression
ressbas.r	⊢ 𝑅 = (𝑊 ↾s 𝐴)
ressbas.b	⊢ 𝐵 = (Base‘𝑊)

Assertion

Ref	Expression
ressbasOLD	⊢ (𝐴 ∈ 𝑉 → (𝐴 ∩ 𝐵) = (Base‘𝑅))

Proof of Theorem ressbasOLD

Step	Hyp	Ref	Expression
1		ressbas.b	. . . . 5 ⊢ 𝐵 = (Base‘𝑊)
2		simp1 1134	. . . . . 6 ⊢ ((𝐵 ⊆ 𝐴 ∧ 𝑊 ∈ V ∧ 𝐴 ∈ 𝑉) → 𝐵 ⊆ 𝐴)
3		sseqin2 4146	. . . . . 6 ⊢ (𝐵 ⊆ 𝐴 ↔ (𝐴 ∩ 𝐵) = 𝐵)
4	2, 3	sylib 217	. . . . 5 ⊢ ((𝐵 ⊆ 𝐴 ∧ 𝑊 ∈ V ∧ 𝐴 ∈ 𝑉) → (𝐴 ∩ 𝐵) = 𝐵)
5		ressbas.r	. . . . . . 7 ⊢ 𝑅 = (𝑊 ↾s 𝐴)
6	5, 1	ressid2 16871	. . . . . 6 ⊢ ((𝐵 ⊆ 𝐴 ∧ 𝑊 ∈ V ∧ 𝐴 ∈ 𝑉) → 𝑅 = 𝑊)
7	6	fveq2d 6760	. . . . 5 ⊢ ((𝐵 ⊆ 𝐴 ∧ 𝑊 ∈ V ∧ 𝐴 ∈ 𝑉) → (Base‘𝑅) = (Base‘𝑊))
8	1, 4, 7	3eqtr4a 2805	. . . 4 ⊢ ((𝐵 ⊆ 𝐴 ∧ 𝑊 ∈ V ∧ 𝐴 ∈ 𝑉) → (𝐴 ∩ 𝐵) = (Base‘𝑅))
9	8	3expib 1120	. . 3 ⊢ (𝐵 ⊆ 𝐴 → ((𝑊 ∈ V ∧ 𝐴 ∈ 𝑉) → (𝐴 ∩ 𝐵) = (Base‘𝑅)))
10		simp2 1135	. . . . . 6 ⊢ ((¬ 𝐵 ⊆ 𝐴 ∧ 𝑊 ∈ V ∧ 𝐴 ∈ 𝑉) → 𝑊 ∈ V)
11	1	fvexi 6770	. . . . . . 7 ⊢ 𝐵 ∈ V
12	11	inex2 5237	. . . . . 6 ⊢ (𝐴 ∩ 𝐵) ∈ V
13		baseid 16843	. . . . . . 7 ⊢ Base = Slot (Base‘ndx)
14	13	setsid 16837	. . . . . 6 ⊢ ((𝑊 ∈ V ∧ (𝐴 ∩ 𝐵) ∈ V) → (𝐴 ∩ 𝐵) = (Base‘(𝑊 sSet ⟨(Base‘ndx), (𝐴 ∩ 𝐵)⟩)))
15	10, 12, 14	sylancl 585	. . . . 5 ⊢ ((¬ 𝐵 ⊆ 𝐴 ∧ 𝑊 ∈ V ∧ 𝐴 ∈ 𝑉) → (𝐴 ∩ 𝐵) = (Base‘(𝑊 sSet ⟨(Base‘ndx), (𝐴 ∩ 𝐵)⟩)))
16	5, 1	ressval2 16872	. . . . . 6 ⊢ ((¬ 𝐵 ⊆ 𝐴 ∧ 𝑊 ∈ V ∧ 𝐴 ∈ 𝑉) → 𝑅 = (𝑊 sSet ⟨(Base‘ndx), (𝐴 ∩ 𝐵)⟩))
17	16	fveq2d 6760	. . . . 5 ⊢ ((¬ 𝐵 ⊆ 𝐴 ∧ 𝑊 ∈ V ∧ 𝐴 ∈ 𝑉) → (Base‘𝑅) = (Base‘(𝑊 sSet ⟨(Base‘ndx), (𝐴 ∩ 𝐵)⟩)))
18	15, 17	eqtr4d 2781	. . . 4 ⊢ ((¬ 𝐵 ⊆ 𝐴 ∧ 𝑊 ∈ V ∧ 𝐴 ∈ 𝑉) → (𝐴 ∩ 𝐵) = (Base‘𝑅))
19	18	3expib 1120	. . 3 ⊢ (¬ 𝐵 ⊆ 𝐴 → ((𝑊 ∈ V ∧ 𝐴 ∈ 𝑉) → (𝐴 ∩ 𝐵) = (Base‘𝑅)))
20	9, 19	pm2.61i 182	. 2 ⊢ ((𝑊 ∈ V ∧ 𝐴 ∈ 𝑉) → (𝐴 ∩ 𝐵) = (Base‘𝑅))
21		0fv 6795	. . . . 5 ⊢ (∅‘(Base‘ndx)) = ∅
22		0ex 5226	. . . . . 6 ⊢ ∅ ∈ V
23	22, 13	strfvn 16815	. . . . 5 ⊢ (Base‘∅) = (∅‘(Base‘ndx))
24		in0 4322	. . . . 5 ⊢ (𝐴 ∩ ∅) = ∅
25	21, 23, 24	3eqtr4ri 2777	. . . 4 ⊢ (𝐴 ∩ ∅) = (Base‘∅)
26		fvprc 6748	. . . . . 6 ⊢ (¬ 𝑊 ∈ V → (Base‘𝑊) = ∅)
27	1, 26	eqtrid 2790	. . . . 5 ⊢ (¬ 𝑊 ∈ V → 𝐵 = ∅)
28	27	ineq2d 4143	. . . 4 ⊢ (¬ 𝑊 ∈ V → (𝐴 ∩ 𝐵) = (𝐴 ∩ ∅))
29		reldmress 16869	. . . . . . 7 ⊢ Rel dom ↾s
30	29	ovprc1 7294	. . . . . 6 ⊢ (¬ 𝑊 ∈ V → (𝑊 ↾s 𝐴) = ∅)
31	5, 30	eqtrid 2790	. . . . 5 ⊢ (¬ 𝑊 ∈ V → 𝑅 = ∅)
32	31	fveq2d 6760	. . . 4 ⊢ (¬ 𝑊 ∈ V → (Base‘𝑅) = (Base‘∅))
33	25, 28, 32	3eqtr4a 2805	. . 3 ⊢ (¬ 𝑊 ∈ V → (𝐴 ∩ 𝐵) = (Base‘𝑅))
34	33	adantr 480	. 2 ⊢ ((¬ 𝑊 ∈ V ∧ 𝐴 ∈ 𝑉) → (𝐴 ∩ 𝐵) = (Base‘𝑅))
35	20, 34	pm2.61ian 808	1 ⊢ (𝐴 ∈ 𝑉 → (𝐴 ∩ 𝐵) = (Base‘𝑅))

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 395   ∧ w3a 1085   = wceq 1539   ∈ wcel 2108  Vcvv 3422   ∩ cin 3882   ⊆ wss 3883  ∅c0 4253  ⟨cop 4564  ‘cfv 6418  (class class class)co 7255   sSet csts 16792  ndxcnx 16822  Basecbs 16840   ↾_s cress 16867

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-10 2139  ax-11 2156  ax-12 2173  ax-ext 2709  ax-sep 5218  ax-nul 5225  ax-pow 5283  ax-pr 5347  ax-un 7566  ax-cnex 10858  ax-1cn 10860  ax-addcl 10862

This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3or 1086  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1784  df-nf 1788  df-sb 2069  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2817  df-nfc 2888  df-ne 2943  df-ral 3068  df-rex 3069  df-reu 3070  df-rab 3072  df-v 3424  df-sbc 3712  df-csb 3829  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-pss 3902  df-nul 4254  df-if 4457  df-pw 4532  df-sn 4559  df-pr 4561  df-tp 4563  df-op 4565  df-uni 4837  df-iun 4923  df-br 5071  df-opab 5133  df-mpt 5154  df-tr 5188  df-id 5480  df-eprel 5486  df-po 5494  df-so 5495  df-fr 5535  df-we 5537  df-xp 5586  df-rel 5587  df-cnv 5588  df-co 5589  df-dm 5590  df-rn 5591  df-res 5592  df-ima 5593  df-pred 6191  df-ord 6254  df-on 6255  df-lim 6256  df-suc 6257  df-iota 6376  df-fun 6420  df-fn 6421  df-f 6422  df-f1 6423  df-fo 6424  df-f1o 6425  df-fv 6426  df-ov 7258  df-oprab 7259  df-mpo 7260  df-om 7688  df-2nd 7805  df-frecs 8068  df-wrecs 8099  df-recs 8173  df-rdg 8212  df-nn 11904  df-sets 16793  df-slot 16811  df-ndx 16823  df-base 16841  df-ress 16868

This theorem is referenced by: (None)