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Theorem filnetlem4 33737
Description: Lemma for filnet 33738. (Contributed by Jeff Hankins, 15-Dec-2009.) (Revised by Mario Carneiro, 8-Aug-2015.)
Hypotheses
Ref Expression
filnet.h 𝐻 = 𝑛𝐹 ({𝑛} × 𝑛)
filnet.d 𝐷 = {⟨𝑥, 𝑦⟩ ∣ ((𝑥𝐻𝑦𝐻) ∧ (1st𝑦) ⊆ (1st𝑥))}
Assertion
Ref Expression
filnetlem4 (𝐹 ∈ (Fil‘𝑋) → ∃𝑑 ∈ DirRel ∃𝑓(𝑓:dom 𝑑𝑋𝐹 = ((𝑋 FilMap 𝑓)‘ran (tail‘𝑑))))
Distinct variable groups:   𝑥,𝑦   𝑓,𝑑,𝑛,𝑥,𝑦,𝐹   𝐻,𝑑,𝑓,𝑥,𝑦   𝐷,𝑑,𝑓   𝑋,𝑑,𝑓,𝑛
Allowed substitution hints:   𝐷(𝑥,𝑦,𝑛)   𝐻(𝑛)   𝑋(𝑥,𝑦)

Proof of Theorem filnetlem4
Dummy variables 𝑘 𝑚 𝑡 𝑣 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 filnet.h . . . . 5 𝐻 = 𝑛𝐹 ({𝑛} × 𝑛)
2 filnet.d . . . . 5 𝐷 = {⟨𝑥, 𝑦⟩ ∣ ((𝑥𝐻𝑦𝐻) ∧ (1st𝑦) ⊆ (1st𝑥))}
31, 2filnetlem3 33736 . . . 4 (𝐻 = 𝐷 ∧ (𝐹 ∈ (Fil‘𝑋) → (𝐻 ⊆ (𝐹 × 𝑋) ∧ 𝐷 ∈ DirRel)))
43simpri 489 . . 3 (𝐹 ∈ (Fil‘𝑋) → (𝐻 ⊆ (𝐹 × 𝑋) ∧ 𝐷 ∈ DirRel))
54simprd 499 . 2 (𝐹 ∈ (Fil‘𝑋) → 𝐷 ∈ DirRel)
6 f2ndres 7689 . . . . 5 (2nd ↾ (𝐹 × 𝑋)):(𝐹 × 𝑋)⟶𝑋
74simpld 498 . . . . 5 (𝐹 ∈ (Fil‘𝑋) → 𝐻 ⊆ (𝐹 × 𝑋))
8 fssres2 6519 . . . . 5 (((2nd ↾ (𝐹 × 𝑋)):(𝐹 × 𝑋)⟶𝑋𝐻 ⊆ (𝐹 × 𝑋)) → (2nd𝐻):𝐻𝑋)
96, 7, 8sylancr 590 . . . 4 (𝐹 ∈ (Fil‘𝑋) → (2nd𝐻):𝐻𝑋)
10 filtop 22439 . . . . . 6 (𝐹 ∈ (Fil‘𝑋) → 𝑋𝐹)
11 xpexg 7448 . . . . . 6 ((𝐹 ∈ (Fil‘𝑋) ∧ 𝑋𝐹) → (𝐹 × 𝑋) ∈ V)
1210, 11mpdan 686 . . . . 5 (𝐹 ∈ (Fil‘𝑋) → (𝐹 × 𝑋) ∈ V)
1312, 7ssexd 5201 . . . 4 (𝐹 ∈ (Fil‘𝑋) → 𝐻 ∈ V)
14 fex 6962 . . . 4 (((2nd𝐻):𝐻𝑋𝐻 ∈ V) → (2nd𝐻) ∈ V)
159, 13, 14syl2anc 587 . . 3 (𝐹 ∈ (Fil‘𝑋) → (2nd𝐻) ∈ V)
16 dirdm 17823 . . . . . . . 8 (𝐷 ∈ DirRel → dom 𝐷 = 𝐷)
175, 16syl 17 . . . . . . 7 (𝐹 ∈ (Fil‘𝑋) → dom 𝐷 = 𝐷)
183simpli 487 . . . . . . 7 𝐻 = 𝐷
1917, 18syl6reqr 2875 . . . . . 6 (𝐹 ∈ (Fil‘𝑋) → 𝐻 = dom 𝐷)
2019feq2d 6473 . . . . 5 (𝐹 ∈ (Fil‘𝑋) → ((2nd𝐻):𝐻𝑋 ↔ (2nd𝐻):dom 𝐷𝑋))
219, 20mpbid 235 . . . 4 (𝐹 ∈ (Fil‘𝑋) → (2nd𝐻):dom 𝐷𝑋)
22 eqid 2821 . . . . . . . . . . . . . 14 dom 𝐷 = dom 𝐷
2322tailf 33731 . . . . . . . . . . . . 13 (𝐷 ∈ DirRel → (tail‘𝐷):dom 𝐷⟶𝒫 dom 𝐷)
245, 23syl 17 . . . . . . . . . . . 12 (𝐹 ∈ (Fil‘𝑋) → (tail‘𝐷):dom 𝐷⟶𝒫 dom 𝐷)
2519feq2d 6473 . . . . . . . . . . . 12 (𝐹 ∈ (Fil‘𝑋) → ((tail‘𝐷):𝐻⟶𝒫 dom 𝐷 ↔ (tail‘𝐷):dom 𝐷⟶𝒫 dom 𝐷))
2624, 25mpbird 260 . . . . . . . . . . 11 (𝐹 ∈ (Fil‘𝑋) → (tail‘𝐷):𝐻⟶𝒫 dom 𝐷)
2726adantr 484 . . . . . . . . . 10 ((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) → (tail‘𝐷):𝐻⟶𝒫 dom 𝐷)
28 ffn 6487 . . . . . . . . . 10 ((tail‘𝐷):𝐻⟶𝒫 dom 𝐷 → (tail‘𝐷) Fn 𝐻)
29 imaeq2 5898 . . . . . . . . . . . 12 (𝑑 = ((tail‘𝐷)‘𝑓) → ((2nd𝐻) “ 𝑑) = ((2nd𝐻) “ ((tail‘𝐷)‘𝑓)))
3029sseq1d 3974 . . . . . . . . . . 11 (𝑑 = ((tail‘𝐷)‘𝑓) → (((2nd𝐻) “ 𝑑) ⊆ 𝑡 ↔ ((2nd𝐻) “ ((tail‘𝐷)‘𝑓)) ⊆ 𝑡))
3130rexrn 6826 . . . . . . . . . 10 ((tail‘𝐷) Fn 𝐻 → (∃𝑑 ∈ ran (tail‘𝐷)((2nd𝐻) “ 𝑑) ⊆ 𝑡 ↔ ∃𝑓𝐻 ((2nd𝐻) “ ((tail‘𝐷)‘𝑓)) ⊆ 𝑡))
3227, 28, 313syl 18 . . . . . . . . 9 ((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) → (∃𝑑 ∈ ran (tail‘𝐷)((2nd𝐻) “ 𝑑) ⊆ 𝑡 ↔ ∃𝑓𝐻 ((2nd𝐻) “ ((tail‘𝐷)‘𝑓)) ⊆ 𝑡))
33 fo2nd 7685 . . . . . . . . . . . . . . 15 2nd :V–onto→V
34 fofn 6565 . . . . . . . . . . . . . . 15 (2nd :V–onto→V → 2nd Fn V)
3533, 34ax-mp 5 . . . . . . . . . . . . . 14 2nd Fn V
36 ssv 3967 . . . . . . . . . . . . . 14 𝐻 ⊆ V
37 fnssres 6443 . . . . . . . . . . . . . 14 ((2nd Fn V ∧ 𝐻 ⊆ V) → (2nd𝐻) Fn 𝐻)
3835, 36, 37mp2an 691 . . . . . . . . . . . . 13 (2nd𝐻) Fn 𝐻
39 fnfun 6426 . . . . . . . . . . . . 13 ((2nd𝐻) Fn 𝐻 → Fun (2nd𝐻))
4038, 39ax-mp 5 . . . . . . . . . . . 12 Fun (2nd𝐻)
4127ffvelrnda 6824 . . . . . . . . . . . . . . 15 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑓𝐻) → ((tail‘𝐷)‘𝑓) ∈ 𝒫 dom 𝐷)
4241elpwid 4523 . . . . . . . . . . . . . 14 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑓𝐻) → ((tail‘𝐷)‘𝑓) ⊆ dom 𝐷)
4319ad2antrr 725 . . . . . . . . . . . . . 14 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑓𝐻) → 𝐻 = dom 𝐷)
4442, 43sseqtrrd 3984 . . . . . . . . . . . . 13 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑓𝐻) → ((tail‘𝐷)‘𝑓) ⊆ 𝐻)
45 fndm 6428 . . . . . . . . . . . . . 14 ((2nd𝐻) Fn 𝐻 → dom (2nd𝐻) = 𝐻)
4638, 45ax-mp 5 . . . . . . . . . . . . 13 dom (2nd𝐻) = 𝐻
4744, 46sseqtrrdi 3994 . . . . . . . . . . . 12 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑓𝐻) → ((tail‘𝐷)‘𝑓) ⊆ dom (2nd𝐻))
48 funimass4 6703 . . . . . . . . . . . 12 ((Fun (2nd𝐻) ∧ ((tail‘𝐷)‘𝑓) ⊆ dom (2nd𝐻)) → (((2nd𝐻) “ ((tail‘𝐷)‘𝑓)) ⊆ 𝑡 ↔ ∀𝑑 ∈ ((tail‘𝐷)‘𝑓)((2nd𝐻)‘𝑑) ∈ 𝑡))
4940, 47, 48sylancr 590 . . . . . . . . . . 11 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑓𝐻) → (((2nd𝐻) “ ((tail‘𝐷)‘𝑓)) ⊆ 𝑡 ↔ ∀𝑑 ∈ ((tail‘𝐷)‘𝑓)((2nd𝐻)‘𝑑) ∈ 𝑡))
505ad2antrr 725 . . . . . . . . . . . . . . . 16 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑓𝐻) → 𝐷 ∈ DirRel)
51 simpr 488 . . . . . . . . . . . . . . . . 17 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑓𝐻) → 𝑓𝐻)
5251, 43eleqtrd 2914 . . . . . . . . . . . . . . . 16 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑓𝐻) → 𝑓 ∈ dom 𝐷)
53 vex 3474 . . . . . . . . . . . . . . . . 17 𝑑 ∈ V
5453a1i 11 . . . . . . . . . . . . . . . 16 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑓𝐻) → 𝑑 ∈ V)
5522eltail 33730 . . . . . . . . . . . . . . . 16 ((𝐷 ∈ DirRel ∧ 𝑓 ∈ dom 𝐷𝑑 ∈ V) → (𝑑 ∈ ((tail‘𝐷)‘𝑓) ↔ 𝑓𝐷𝑑))
5650, 52, 54, 55syl3anc 1368 . . . . . . . . . . . . . . 15 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑓𝐻) → (𝑑 ∈ ((tail‘𝐷)‘𝑓) ↔ 𝑓𝐷𝑑))
5751biantrurd 536 . . . . . . . . . . . . . . . . 17 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑓𝐻) → (𝑑𝐻 ↔ (𝑓𝐻𝑑𝐻)))
5857anbi1d 632 . . . . . . . . . . . . . . . 16 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑓𝐻) → ((𝑑𝐻 ∧ (1st𝑑) ⊆ (1st𝑓)) ↔ ((𝑓𝐻𝑑𝐻) ∧ (1st𝑑) ⊆ (1st𝑓))))
59 vex 3474 . . . . . . . . . . . . . . . . 17 𝑓 ∈ V
601, 2, 59, 53filnetlem1 33734 . . . . . . . . . . . . . . . 16 (𝑓𝐷𝑑 ↔ ((𝑓𝐻𝑑𝐻) ∧ (1st𝑑) ⊆ (1st𝑓)))
6158, 60syl6bbr 292 . . . . . . . . . . . . . . 15 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑓𝐻) → ((𝑑𝐻 ∧ (1st𝑑) ⊆ (1st𝑓)) ↔ 𝑓𝐷𝑑))
6256, 61bitr4d 285 . . . . . . . . . . . . . 14 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑓𝐻) → (𝑑 ∈ ((tail‘𝐷)‘𝑓) ↔ (𝑑𝐻 ∧ (1st𝑑) ⊆ (1st𝑓))))
6362imbi1d 345 . . . . . . . . . . . . 13 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑓𝐻) → ((𝑑 ∈ ((tail‘𝐷)‘𝑓) → ((2nd𝐻)‘𝑑) ∈ 𝑡) ↔ ((𝑑𝐻 ∧ (1st𝑑) ⊆ (1st𝑓)) → ((2nd𝐻)‘𝑑) ∈ 𝑡)))
64 fvres 6662 . . . . . . . . . . . . . . . . 17 (𝑑𝐻 → ((2nd𝐻)‘𝑑) = (2nd𝑑))
6564eleq1d 2896 . . . . . . . . . . . . . . . 16 (𝑑𝐻 → (((2nd𝐻)‘𝑑) ∈ 𝑡 ↔ (2nd𝑑) ∈ 𝑡))
6665adantr 484 . . . . . . . . . . . . . . 15 ((𝑑𝐻 ∧ (1st𝑑) ⊆ (1st𝑓)) → (((2nd𝐻)‘𝑑) ∈ 𝑡 ↔ (2nd𝑑) ∈ 𝑡))
6766pm5.74i 274 . . . . . . . . . . . . . 14 (((𝑑𝐻 ∧ (1st𝑑) ⊆ (1st𝑓)) → ((2nd𝐻)‘𝑑) ∈ 𝑡) ↔ ((𝑑𝐻 ∧ (1st𝑑) ⊆ (1st𝑓)) → (2nd𝑑) ∈ 𝑡))
68 impexp 454 . . . . . . . . . . . . . 14 (((𝑑𝐻 ∧ (1st𝑑) ⊆ (1st𝑓)) → (2nd𝑑) ∈ 𝑡) ↔ (𝑑𝐻 → ((1st𝑑) ⊆ (1st𝑓) → (2nd𝑑) ∈ 𝑡)))
6967, 68bitri 278 . . . . . . . . . . . . 13 (((𝑑𝐻 ∧ (1st𝑑) ⊆ (1st𝑓)) → ((2nd𝐻)‘𝑑) ∈ 𝑡) ↔ (𝑑𝐻 → ((1st𝑑) ⊆ (1st𝑓) → (2nd𝑑) ∈ 𝑡)))
7063, 69syl6bb 290 . . . . . . . . . . . 12 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑓𝐻) → ((𝑑 ∈ ((tail‘𝐷)‘𝑓) → ((2nd𝐻)‘𝑑) ∈ 𝑡) ↔ (𝑑𝐻 → ((1st𝑑) ⊆ (1st𝑓) → (2nd𝑑) ∈ 𝑡))))
7170ralbidv2 3183 . . . . . . . . . . 11 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑓𝐻) → (∀𝑑 ∈ ((tail‘𝐷)‘𝑓)((2nd𝐻)‘𝑑) ∈ 𝑡 ↔ ∀𝑑𝐻 ((1st𝑑) ⊆ (1st𝑓) → (2nd𝑑) ∈ 𝑡)))
7249, 71bitrd 282 . . . . . . . . . 10 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑓𝐻) → (((2nd𝐻) “ ((tail‘𝐷)‘𝑓)) ⊆ 𝑡 ↔ ∀𝑑𝐻 ((1st𝑑) ⊆ (1st𝑓) → (2nd𝑑) ∈ 𝑡)))
7372rexbidva 3282 . . . . . . . . 9 ((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) → (∃𝑓𝐻 ((2nd𝐻) “ ((tail‘𝐷)‘𝑓)) ⊆ 𝑡 ↔ ∃𝑓𝐻𝑑𝐻 ((1st𝑑) ⊆ (1st𝑓) → (2nd𝑑) ∈ 𝑡)))
74 vex 3474 . . . . . . . . . . . . . . . . 17 𝑘 ∈ V
75 vex 3474 . . . . . . . . . . . . . . . . 17 𝑣 ∈ V
7674, 75op1std 7674 . . . . . . . . . . . . . . . 16 (𝑑 = ⟨𝑘, 𝑣⟩ → (1st𝑑) = 𝑘)
7776sseq1d 3974 . . . . . . . . . . . . . . 15 (𝑑 = ⟨𝑘, 𝑣⟩ → ((1st𝑑) ⊆ (1st𝑓) ↔ 𝑘 ⊆ (1st𝑓)))
7874, 75op2ndd 7675 . . . . . . . . . . . . . . . 16 (𝑑 = ⟨𝑘, 𝑣⟩ → (2nd𝑑) = 𝑣)
7978eleq1d 2896 . . . . . . . . . . . . . . 15 (𝑑 = ⟨𝑘, 𝑣⟩ → ((2nd𝑑) ∈ 𝑡𝑣𝑡))
8077, 79imbi12d 348 . . . . . . . . . . . . . 14 (𝑑 = ⟨𝑘, 𝑣⟩ → (((1st𝑑) ⊆ (1st𝑓) → (2nd𝑑) ∈ 𝑡) ↔ (𝑘 ⊆ (1st𝑓) → 𝑣𝑡)))
8180raliunxp 5683 . . . . . . . . . . . . 13 (∀𝑑 𝑘𝐹 ({𝑘} × 𝑘)((1st𝑑) ⊆ (1st𝑓) → (2nd𝑑) ∈ 𝑡) ↔ ∀𝑘𝐹𝑣𝑘 (𝑘 ⊆ (1st𝑓) → 𝑣𝑡))
82 sneq 4550 . . . . . . . . . . . . . . . . 17 (𝑛 = 𝑘 → {𝑛} = {𝑘})
83 id 22 . . . . . . . . . . . . . . . . 17 (𝑛 = 𝑘𝑛 = 𝑘)
8482, 83xpeq12d 5559 . . . . . . . . . . . . . . . 16 (𝑛 = 𝑘 → ({𝑛} × 𝑛) = ({𝑘} × 𝑘))
8584cbviunv 4938 . . . . . . . . . . . . . . 15 𝑛𝐹 ({𝑛} × 𝑛) = 𝑘𝐹 ({𝑘} × 𝑘)
861, 85eqtri 2844 . . . . . . . . . . . . . 14 𝐻 = 𝑘𝐹 ({𝑘} × 𝑘)
8786raleqi 3394 . . . . . . . . . . . . 13 (∀𝑑𝐻 ((1st𝑑) ⊆ (1st𝑓) → (2nd𝑑) ∈ 𝑡) ↔ ∀𝑑 𝑘𝐹 ({𝑘} × 𝑘)((1st𝑑) ⊆ (1st𝑓) → (2nd𝑑) ∈ 𝑡))
88 dfss3 3932 . . . . . . . . . . . . . . . 16 (𝑘𝑡 ↔ ∀𝑣𝑘 𝑣𝑡)
8988imbi2i 339 . . . . . . . . . . . . . . 15 ((𝑘 ⊆ (1st𝑓) → 𝑘𝑡) ↔ (𝑘 ⊆ (1st𝑓) → ∀𝑣𝑘 𝑣𝑡))
90 r19.21v 3163 . . . . . . . . . . . . . . 15 (∀𝑣𝑘 (𝑘 ⊆ (1st𝑓) → 𝑣𝑡) ↔ (𝑘 ⊆ (1st𝑓) → ∀𝑣𝑘 𝑣𝑡))
9189, 90bitr4i 281 . . . . . . . . . . . . . 14 ((𝑘 ⊆ (1st𝑓) → 𝑘𝑡) ↔ ∀𝑣𝑘 (𝑘 ⊆ (1st𝑓) → 𝑣𝑡))
9291ralbii 3153 . . . . . . . . . . . . 13 (∀𝑘𝐹 (𝑘 ⊆ (1st𝑓) → 𝑘𝑡) ↔ ∀𝑘𝐹𝑣𝑘 (𝑘 ⊆ (1st𝑓) → 𝑣𝑡))
9381, 87, 923bitr4i 306 . . . . . . . . . . . 12 (∀𝑑𝐻 ((1st𝑑) ⊆ (1st𝑓) → (2nd𝑑) ∈ 𝑡) ↔ ∀𝑘𝐹 (𝑘 ⊆ (1st𝑓) → 𝑘𝑡))
9493rexbii 3235 . . . . . . . . . . 11 (∃𝑓𝐻𝑑𝐻 ((1st𝑑) ⊆ (1st𝑓) → (2nd𝑑) ∈ 𝑡) ↔ ∃𝑓𝐻𝑘𝐹 (𝑘 ⊆ (1st𝑓) → 𝑘𝑡))
951rexeqi 3395 . . . . . . . . . . 11 (∃𝑓𝐻𝑘𝐹 (𝑘 ⊆ (1st𝑓) → 𝑘𝑡) ↔ ∃𝑓 𝑛𝐹 ({𝑛} × 𝑛)∀𝑘𝐹 (𝑘 ⊆ (1st𝑓) → 𝑘𝑡))
96 vex 3474 . . . . . . . . . . . . . . . 16 𝑛 ∈ V
97 vex 3474 . . . . . . . . . . . . . . . 16 𝑚 ∈ V
9896, 97op1std 7674 . . . . . . . . . . . . . . 15 (𝑓 = ⟨𝑛, 𝑚⟩ → (1st𝑓) = 𝑛)
9998sseq2d 3975 . . . . . . . . . . . . . 14 (𝑓 = ⟨𝑛, 𝑚⟩ → (𝑘 ⊆ (1st𝑓) ↔ 𝑘𝑛))
10099imbi1d 345 . . . . . . . . . . . . 13 (𝑓 = ⟨𝑛, 𝑚⟩ → ((𝑘 ⊆ (1st𝑓) → 𝑘𝑡) ↔ (𝑘𝑛𝑘𝑡)))
101100ralbidv 3185 . . . . . . . . . . . 12 (𝑓 = ⟨𝑛, 𝑚⟩ → (∀𝑘𝐹 (𝑘 ⊆ (1st𝑓) → 𝑘𝑡) ↔ ∀𝑘𝐹 (𝑘𝑛𝑘𝑡)))
102101rexiunxp 5684 . . . . . . . . . . 11 (∃𝑓 𝑛𝐹 ({𝑛} × 𝑛)∀𝑘𝐹 (𝑘 ⊆ (1st𝑓) → 𝑘𝑡) ↔ ∃𝑛𝐹𝑚𝑛𝑘𝐹 (𝑘𝑛𝑘𝑡))
10394, 95, 1023bitri 300 . . . . . . . . . 10 (∃𝑓𝐻𝑑𝐻 ((1st𝑑) ⊆ (1st𝑓) → (2nd𝑑) ∈ 𝑡) ↔ ∃𝑛𝐹𝑚𝑛𝑘𝐹 (𝑘𝑛𝑘𝑡))
104 fileln0 22434 . . . . . . . . . . . . . 14 ((𝐹 ∈ (Fil‘𝑋) ∧ 𝑛𝐹) → 𝑛 ≠ ∅)
105104adantlr 714 . . . . . . . . . . . . 13 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑛𝐹) → 𝑛 ≠ ∅)
106 r19.9rzv 4418 . . . . . . . . . . . . 13 (𝑛 ≠ ∅ → (∀𝑘𝐹 (𝑘𝑛𝑘𝑡) ↔ ∃𝑚𝑛𝑘𝐹 (𝑘𝑛𝑘𝑡)))
107105, 106syl 17 . . . . . . . . . . . 12 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑛𝐹) → (∀𝑘𝐹 (𝑘𝑛𝑘𝑡) ↔ ∃𝑚𝑛𝑘𝐹 (𝑘𝑛𝑘𝑡)))
108 ssid 3965 . . . . . . . . . . . . . . 15 𝑛𝑛
109 sseq1 3968 . . . . . . . . . . . . . . . . 17 (𝑘 = 𝑛 → (𝑘𝑛𝑛𝑛))
110 sseq1 3968 . . . . . . . . . . . . . . . . 17 (𝑘 = 𝑛 → (𝑘𝑡𝑛𝑡))
111109, 110imbi12d 348 . . . . . . . . . . . . . . . 16 (𝑘 = 𝑛 → ((𝑘𝑛𝑘𝑡) ↔ (𝑛𝑛𝑛𝑡)))
112111rspcv 3595 . . . . . . . . . . . . . . 15 (𝑛𝐹 → (∀𝑘𝐹 (𝑘𝑛𝑘𝑡) → (𝑛𝑛𝑛𝑡)))
113108, 112mpii 46 . . . . . . . . . . . . . 14 (𝑛𝐹 → (∀𝑘𝐹 (𝑘𝑛𝑘𝑡) → 𝑛𝑡))
114113adantl 485 . . . . . . . . . . . . 13 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑛𝐹) → (∀𝑘𝐹 (𝑘𝑛𝑘𝑡) → 𝑛𝑡))
115 sstr2 3950 . . . . . . . . . . . . . . 15 (𝑘𝑛 → (𝑛𝑡𝑘𝑡))
116115com12 32 . . . . . . . . . . . . . 14 (𝑛𝑡 → (𝑘𝑛𝑘𝑡))
117116ralrimivw 3171 . . . . . . . . . . . . 13 (𝑛𝑡 → ∀𝑘𝐹 (𝑘𝑛𝑘𝑡))
118114, 117impbid1 228 . . . . . . . . . . . 12 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑛𝐹) → (∀𝑘𝐹 (𝑘𝑛𝑘𝑡) ↔ 𝑛𝑡))
119107, 118bitr3d 284 . . . . . . . . . . 11 (((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) ∧ 𝑛𝐹) → (∃𝑚𝑛𝑘𝐹 (𝑘𝑛𝑘𝑡) ↔ 𝑛𝑡))
120119rexbidva 3282 . . . . . . . . . 10 ((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) → (∃𝑛𝐹𝑚𝑛𝑘𝐹 (𝑘𝑛𝑘𝑡) ↔ ∃𝑛𝐹 𝑛𝑡))
121103, 120syl5bb 286 . . . . . . . . 9 ((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) → (∃𝑓𝐻𝑑𝐻 ((1st𝑑) ⊆ (1st𝑓) → (2nd𝑑) ∈ 𝑡) ↔ ∃𝑛𝐹 𝑛𝑡))
12232, 73, 1213bitrd 308 . . . . . . . 8 ((𝐹 ∈ (Fil‘𝑋) ∧ 𝑡𝑋) → (∃𝑑 ∈ ran (tail‘𝐷)((2nd𝐻) “ 𝑑) ⊆ 𝑡 ↔ ∃𝑛𝐹 𝑛𝑡))
123122pm5.32da 582 . . . . . . 7 (𝐹 ∈ (Fil‘𝑋) → ((𝑡𝑋 ∧ ∃𝑑 ∈ ran (tail‘𝐷)((2nd𝐻) “ 𝑑) ⊆ 𝑡) ↔ (𝑡𝑋 ∧ ∃𝑛𝐹 𝑛𝑡)))
124 filn0 22446 . . . . . . . . . . . 12 (𝐹 ∈ (Fil‘𝑋) → 𝐹 ≠ ∅)
12596snnz 4684 . . . . . . . . . . . . . . . 16 {𝑛} ≠ ∅
126104, 125jctil 523 . . . . . . . . . . . . . . 15 ((𝐹 ∈ (Fil‘𝑋) ∧ 𝑛𝐹) → ({𝑛} ≠ ∅ ∧ 𝑛 ≠ ∅))
127 neanior 3099 . . . . . . . . . . . . . . 15 (({𝑛} ≠ ∅ ∧ 𝑛 ≠ ∅) ↔ ¬ ({𝑛} = ∅ ∨ 𝑛 = ∅))
128126, 127sylib 221 . . . . . . . . . . . . . 14 ((𝐹 ∈ (Fil‘𝑋) ∧ 𝑛𝐹) → ¬ ({𝑛} = ∅ ∨ 𝑛 = ∅))
129 ss0b 4324 . . . . . . . . . . . . . . 15 (({𝑛} × 𝑛) ⊆ ∅ ↔ ({𝑛} × 𝑛) = ∅)
130 xpeq0 5990 . . . . . . . . . . . . . . 15 (({𝑛} × 𝑛) = ∅ ↔ ({𝑛} = ∅ ∨ 𝑛 = ∅))
131129, 130bitri 278 . . . . . . . . . . . . . 14 (({𝑛} × 𝑛) ⊆ ∅ ↔ ({𝑛} = ∅ ∨ 𝑛 = ∅))
132128, 131sylnibr 332 . . . . . . . . . . . . 13 ((𝐹 ∈ (Fil‘𝑋) ∧ 𝑛𝐹) → ¬ ({𝑛} × 𝑛) ⊆ ∅)
133132ralrimiva 3170 . . . . . . . . . . . 12 (𝐹 ∈ (Fil‘𝑋) → ∀𝑛𝐹 ¬ ({𝑛} × 𝑛) ⊆ ∅)
134 r19.2z 4413 . . . . . . . . . . . 12 ((𝐹 ≠ ∅ ∧ ∀𝑛𝐹 ¬ ({𝑛} × 𝑛) ⊆ ∅) → ∃𝑛𝐹 ¬ ({𝑛} × 𝑛) ⊆ ∅)
135124, 133, 134syl2anc 587 . . . . . . . . . . 11 (𝐹 ∈ (Fil‘𝑋) → ∃𝑛𝐹 ¬ ({𝑛} × 𝑛) ⊆ ∅)
136 rexnal 3226 . . . . . . . . . . 11 (∃𝑛𝐹 ¬ ({𝑛} × 𝑛) ⊆ ∅ ↔ ¬ ∀𝑛𝐹 ({𝑛} × 𝑛) ⊆ ∅)
137135, 136sylib 221 . . . . . . . . . 10 (𝐹 ∈ (Fil‘𝑋) → ¬ ∀𝑛𝐹 ({𝑛} × 𝑛) ⊆ ∅)
1381sseq1i 3971 . . . . . . . . . . . 12 (𝐻 ⊆ ∅ ↔ 𝑛𝐹 ({𝑛} × 𝑛) ⊆ ∅)
139 ss0b 4324 . . . . . . . . . . . 12 (𝐻 ⊆ ∅ ↔ 𝐻 = ∅)
140 iunss 4942 . . . . . . . . . . . 12 ( 𝑛𝐹 ({𝑛} × 𝑛) ⊆ ∅ ↔ ∀𝑛𝐹 ({𝑛} × 𝑛) ⊆ ∅)
141138, 139, 1403bitr3i 304 . . . . . . . . . . 11 (𝐻 = ∅ ↔ ∀𝑛𝐹 ({𝑛} × 𝑛) ⊆ ∅)
142141necon3abii 3053 . . . . . . . . . 10 (𝐻 ≠ ∅ ↔ ¬ ∀𝑛𝐹 ({𝑛} × 𝑛) ⊆ ∅)
143137, 142sylibr 237 . . . . . . . . 9 (𝐹 ∈ (Fil‘𝑋) → 𝐻 ≠ ∅)
144 dmresi 5894 . . . . . . . . . . . 12 dom ( I ↾ 𝐻) = 𝐻
1451, 2filnetlem2 33735 . . . . . . . . . . . . . 14 (( I ↾ 𝐻) ⊆ 𝐷𝐷 ⊆ (𝐻 × 𝐻))
146145simpli 487 . . . . . . . . . . . . 13 ( I ↾ 𝐻) ⊆ 𝐷
147 dmss 5744 . . . . . . . . . . . . 13 (( I ↾ 𝐻) ⊆ 𝐷 → dom ( I ↾ 𝐻) ⊆ dom 𝐷)
148146, 147ax-mp 5 . . . . . . . . . . . 12 dom ( I ↾ 𝐻) ⊆ dom 𝐷
149144, 148eqsstrri 3978 . . . . . . . . . . 11 𝐻 ⊆ dom 𝐷
150145simpri 489 . . . . . . . . . . . . 13 𝐷 ⊆ (𝐻 × 𝐻)
151 dmss 5744 . . . . . . . . . . . . 13 (𝐷 ⊆ (𝐻 × 𝐻) → dom 𝐷 ⊆ dom (𝐻 × 𝐻))
152150, 151ax-mp 5 . . . . . . . . . . . 12 dom 𝐷 ⊆ dom (𝐻 × 𝐻)
153 dmxpid 5773 . . . . . . . . . . . 12 dom (𝐻 × 𝐻) = 𝐻
154152, 153sseqtri 3979 . . . . . . . . . . 11 dom 𝐷𝐻
155149, 154eqssi 3959 . . . . . . . . . 10 𝐻 = dom 𝐷
156155tailfb 33733 . . . . . . . . 9 ((𝐷 ∈ DirRel ∧ 𝐻 ≠ ∅) → ran (tail‘𝐷) ∈ (fBas‘𝐻))
1575, 143, 156syl2anc 587 . . . . . . . 8 (𝐹 ∈ (Fil‘𝑋) → ran (tail‘𝐷) ∈ (fBas‘𝐻))
158 elfm 22531 . . . . . . . 8 ((𝑋𝐹 ∧ ran (tail‘𝐷) ∈ (fBas‘𝐻) ∧ (2nd𝐻):𝐻𝑋) → (𝑡 ∈ ((𝑋 FilMap (2nd𝐻))‘ran (tail‘𝐷)) ↔ (𝑡𝑋 ∧ ∃𝑑 ∈ ran (tail‘𝐷)((2nd𝐻) “ 𝑑) ⊆ 𝑡)))
15910, 157, 9, 158syl3anc 1368 . . . . . . 7 (𝐹 ∈ (Fil‘𝑋) → (𝑡 ∈ ((𝑋 FilMap (2nd𝐻))‘ran (tail‘𝐷)) ↔ (𝑡𝑋 ∧ ∃𝑑 ∈ ran (tail‘𝐷)((2nd𝐻) “ 𝑑) ⊆ 𝑡)))
160 filfbas 22432 . . . . . . . 8 (𝐹 ∈ (Fil‘𝑋) → 𝐹 ∈ (fBas‘𝑋))
161 elfg 22455 . . . . . . . 8 (𝐹 ∈ (fBas‘𝑋) → (𝑡 ∈ (𝑋filGen𝐹) ↔ (𝑡𝑋 ∧ ∃𝑛𝐹 𝑛𝑡)))
162160, 161syl 17 . . . . . . 7 (𝐹 ∈ (Fil‘𝑋) → (𝑡 ∈ (𝑋filGen𝐹) ↔ (𝑡𝑋 ∧ ∃𝑛𝐹 𝑛𝑡)))
163123, 159, 1623bitr4d 314 . . . . . 6 (𝐹 ∈ (Fil‘𝑋) → (𝑡 ∈ ((𝑋 FilMap (2nd𝐻))‘ran (tail‘𝐷)) ↔ 𝑡 ∈ (𝑋filGen𝐹)))
164163eqrdv 2819 . . . . 5 (𝐹 ∈ (Fil‘𝑋) → ((𝑋 FilMap (2nd𝐻))‘ran (tail‘𝐷)) = (𝑋filGen𝐹))
165 fgfil 22459 . . . . 5 (𝐹 ∈ (Fil‘𝑋) → (𝑋filGen𝐹) = 𝐹)
166164, 165eqtr2d 2857 . . . 4 (𝐹 ∈ (Fil‘𝑋) → 𝐹 = ((𝑋 FilMap (2nd𝐻))‘ran (tail‘𝐷)))
16721, 166jca 515 . . 3 (𝐹 ∈ (Fil‘𝑋) → ((2nd𝐻):dom 𝐷𝑋𝐹 = ((𝑋 FilMap (2nd𝐻))‘ran (tail‘𝐷))))
168 feq1 6468 . . . . 5 (𝑓 = (2nd𝐻) → (𝑓:dom 𝐷𝑋 ↔ (2nd𝐻):dom 𝐷𝑋))
169 oveq2 7138 . . . . . . 7 (𝑓 = (2nd𝐻) → (𝑋 FilMap 𝑓) = (𝑋 FilMap (2nd𝐻)))
170169fveq1d 6645 . . . . . 6 (𝑓 = (2nd𝐻) → ((𝑋 FilMap 𝑓)‘ran (tail‘𝐷)) = ((𝑋 FilMap (2nd𝐻))‘ran (tail‘𝐷)))
171170eqeq2d 2832 . . . . 5 (𝑓 = (2nd𝐻) → (𝐹 = ((𝑋 FilMap 𝑓)‘ran (tail‘𝐷)) ↔ 𝐹 = ((𝑋 FilMap (2nd𝐻))‘ran (tail‘𝐷))))
172168, 171anbi12d 633 . . . 4 (𝑓 = (2nd𝐻) → ((𝑓:dom 𝐷𝑋𝐹 = ((𝑋 FilMap 𝑓)‘ran (tail‘𝐷))) ↔ ((2nd𝐻):dom 𝐷𝑋𝐹 = ((𝑋 FilMap (2nd𝐻))‘ran (tail‘𝐷)))))
173172spcegv 3574 . . 3 ((2nd𝐻) ∈ V → (((2nd𝐻):dom 𝐷𝑋𝐹 = ((𝑋 FilMap (2nd𝐻))‘ran (tail‘𝐷))) → ∃𝑓(𝑓:dom 𝐷𝑋𝐹 = ((𝑋 FilMap 𝑓)‘ran (tail‘𝐷)))))
17415, 167, 173sylc 65 . 2 (𝐹 ∈ (Fil‘𝑋) → ∃𝑓(𝑓:dom 𝐷𝑋𝐹 = ((𝑋 FilMap 𝑓)‘ran (tail‘𝐷))))
175 dmeq 5745 . . . . . 6 (𝑑 = 𝐷 → dom 𝑑 = dom 𝐷)
176175feq2d 6473 . . . . 5 (𝑑 = 𝐷 → (𝑓:dom 𝑑𝑋𝑓:dom 𝐷𝑋))
177 fveq2 6643 . . . . . . . 8 (𝑑 = 𝐷 → (tail‘𝑑) = (tail‘𝐷))
178177rneqd 5781 . . . . . . 7 (𝑑 = 𝐷 → ran (tail‘𝑑) = ran (tail‘𝐷))
179178fveq2d 6647 . . . . . 6 (𝑑 = 𝐷 → ((𝑋 FilMap 𝑓)‘ran (tail‘𝑑)) = ((𝑋 FilMap 𝑓)‘ran (tail‘𝐷)))
180179eqeq2d 2832 . . . . 5 (𝑑 = 𝐷 → (𝐹 = ((𝑋 FilMap 𝑓)‘ran (tail‘𝑑)) ↔ 𝐹 = ((𝑋 FilMap 𝑓)‘ran (tail‘𝐷))))
181176, 180anbi12d 633 . . . 4 (𝑑 = 𝐷 → ((𝑓:dom 𝑑𝑋𝐹 = ((𝑋 FilMap 𝑓)‘ran (tail‘𝑑))) ↔ (𝑓:dom 𝐷𝑋𝐹 = ((𝑋 FilMap 𝑓)‘ran (tail‘𝐷)))))
182181exbidv 1923 . . 3 (𝑑 = 𝐷 → (∃𝑓(𝑓:dom 𝑑𝑋𝐹 = ((𝑋 FilMap 𝑓)‘ran (tail‘𝑑))) ↔ ∃𝑓(𝑓:dom 𝐷𝑋𝐹 = ((𝑋 FilMap 𝑓)‘ran (tail‘𝐷)))))
183182rspcev 3600 . 2 ((𝐷 ∈ DirRel ∧ ∃𝑓(𝑓:dom 𝐷𝑋𝐹 = ((𝑋 FilMap 𝑓)‘ran (tail‘𝐷)))) → ∃𝑑 ∈ DirRel ∃𝑓(𝑓:dom 𝑑𝑋𝐹 = ((𝑋 FilMap 𝑓)‘ran (tail‘𝑑))))
1845, 174, 183syl2anc 587 1 (𝐹 ∈ (Fil‘𝑋) → ∃𝑑 ∈ DirRel ∃𝑓(𝑓:dom 𝑑𝑋𝐹 = ((𝑋 FilMap 𝑓)‘ran (tail‘𝑑))))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 209  wa 399  wo 844   = wceq 1538  wex 1781  wcel 2115  wne 3007  wral 3126  wrex 3127  Vcvv 3471  wss 3910  c0 4266  𝒫 cpw 4512  {csn 4540  cop 4546   cuni 4811   ciun 4892   class class class wbr 5039  {copab 5101   I cid 5432   × cxp 5526  dom cdm 5528  ran crn 5529  cres 5530  cima 5531  Fun wfun 6322   Fn wfn 6323  wf 6324  ontowfo 6326  cfv 6328  (class class class)co 7130  1st c1st 7662  2nd c2nd 7663  DirRelcdir 17817  tailctail 17818  fBascfbas 20509  filGencfg 20510  Filcfil 22429   FilMap cfm 22517
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 1912  ax-6 1971  ax-7 2016  ax-8 2117  ax-9 2125  ax-10 2146  ax-11 2162  ax-12 2178  ax-ext 2793  ax-rep 5163  ax-sep 5176  ax-nul 5183  ax-pow 5239  ax-pr 5303  ax-un 7436
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2071  df-mo 2623  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2892  df-nfc 2960  df-ne 3008  df-nel 3112  df-ral 3131  df-rex 3132  df-reu 3133  df-rab 3135  df-v 3473  df-sbc 3750  df-csb 3858  df-dif 3913  df-un 3915  df-in 3917  df-ss 3927  df-nul 4267  df-if 4441  df-pw 4514  df-sn 4541  df-pr 4543  df-op 4547  df-uni 4812  df-iun 4894  df-br 5040  df-opab 5102  df-mpt 5120  df-id 5433  df-xp 5534  df-rel 5535  df-cnv 5536  df-co 5537  df-dm 5538  df-rn 5539  df-res 5540  df-ima 5541  df-iota 6287  df-fun 6330  df-fn 6331  df-f 6332  df-f1 6333  df-fo 6334  df-f1o 6335  df-fv 6336  df-ov 7133  df-oprab 7134  df-mpo 7135  df-1st 7664  df-2nd 7665  df-dir 17819  df-tail 17820  df-fbas 20518  df-fg 20519  df-fil 22430  df-fm 22522
This theorem is referenced by:  filnet  33738
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