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Theorem xppreima 30405
 Description: The preimage of a Cartesian product is the intersection of the preimages of each component function. (Contributed by Thierry Arnoux, 6-Jun-2017.)
Assertion
Ref Expression
xppreima ((Fun 𝐹 ∧ ran 𝐹 ⊆ (V × V)) → (𝐹 “ (𝑌 × 𝑍)) = (((1st𝐹) “ 𝑌) ∩ ((2nd𝐹) “ 𝑍)))

Proof of Theorem xppreima
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 funfn 6373 . . . . 5 (Fun 𝐹𝐹 Fn dom 𝐹)
2 fncnvima2 6822 . . . . 5 (𝐹 Fn dom 𝐹 → (𝐹 “ (𝑌 × 𝑍)) = {𝑥 ∈ dom 𝐹 ∣ (𝐹𝑥) ∈ (𝑌 × 𝑍)})
31, 2sylbi 220 . . . 4 (Fun 𝐹 → (𝐹 “ (𝑌 × 𝑍)) = {𝑥 ∈ dom 𝐹 ∣ (𝐹𝑥) ∈ (𝑌 × 𝑍)})
43adantr 484 . . 3 ((Fun 𝐹 ∧ ran 𝐹 ⊆ (V × V)) → (𝐹 “ (𝑌 × 𝑍)) = {𝑥 ∈ dom 𝐹 ∣ (𝐹𝑥) ∈ (𝑌 × 𝑍)})
5 fvco 6750 . . . . . . . . . 10 ((Fun 𝐹𝑥 ∈ dom 𝐹) → ((1st𝐹)‘𝑥) = (1st ‘(𝐹𝑥)))
6 fvco 6750 . . . . . . . . . 10 ((Fun 𝐹𝑥 ∈ dom 𝐹) → ((2nd𝐹)‘𝑥) = (2nd ‘(𝐹𝑥)))
75, 6opeq12d 4797 . . . . . . . . 9 ((Fun 𝐹𝑥 ∈ dom 𝐹) → ⟨((1st𝐹)‘𝑥), ((2nd𝐹)‘𝑥)⟩ = ⟨(1st ‘(𝐹𝑥)), (2nd ‘(𝐹𝑥))⟩)
87eqeq2d 2835 . . . . . . . 8 ((Fun 𝐹𝑥 ∈ dom 𝐹) → ((𝐹𝑥) = ⟨((1st𝐹)‘𝑥), ((2nd𝐹)‘𝑥)⟩ ↔ (𝐹𝑥) = ⟨(1st ‘(𝐹𝑥)), (2nd ‘(𝐹𝑥))⟩))
95eleq1d 2900 . . . . . . . . 9 ((Fun 𝐹𝑥 ∈ dom 𝐹) → (((1st𝐹)‘𝑥) ∈ 𝑌 ↔ (1st ‘(𝐹𝑥)) ∈ 𝑌))
106eleq1d 2900 . . . . . . . . 9 ((Fun 𝐹𝑥 ∈ dom 𝐹) → (((2nd𝐹)‘𝑥) ∈ 𝑍 ↔ (2nd ‘(𝐹𝑥)) ∈ 𝑍))
119, 10anbi12d 633 . . . . . . . 8 ((Fun 𝐹𝑥 ∈ dom 𝐹) → ((((1st𝐹)‘𝑥) ∈ 𝑌 ∧ ((2nd𝐹)‘𝑥) ∈ 𝑍) ↔ ((1st ‘(𝐹𝑥)) ∈ 𝑌 ∧ (2nd ‘(𝐹𝑥)) ∈ 𝑍)))
128, 11anbi12d 633 . . . . . . 7 ((Fun 𝐹𝑥 ∈ dom 𝐹) → (((𝐹𝑥) = ⟨((1st𝐹)‘𝑥), ((2nd𝐹)‘𝑥)⟩ ∧ (((1st𝐹)‘𝑥) ∈ 𝑌 ∧ ((2nd𝐹)‘𝑥) ∈ 𝑍)) ↔ ((𝐹𝑥) = ⟨(1st ‘(𝐹𝑥)), (2nd ‘(𝐹𝑥))⟩ ∧ ((1st ‘(𝐹𝑥)) ∈ 𝑌 ∧ (2nd ‘(𝐹𝑥)) ∈ 𝑍))))
13 elxp6 7718 . . . . . . 7 ((𝐹𝑥) ∈ (𝑌 × 𝑍) ↔ ((𝐹𝑥) = ⟨(1st ‘(𝐹𝑥)), (2nd ‘(𝐹𝑥))⟩ ∧ ((1st ‘(𝐹𝑥)) ∈ 𝑌 ∧ (2nd ‘(𝐹𝑥)) ∈ 𝑍)))
1412, 13syl6rbbr 293 . . . . . 6 ((Fun 𝐹𝑥 ∈ dom 𝐹) → ((𝐹𝑥) ∈ (𝑌 × 𝑍) ↔ ((𝐹𝑥) = ⟨((1st𝐹)‘𝑥), ((2nd𝐹)‘𝑥)⟩ ∧ (((1st𝐹)‘𝑥) ∈ 𝑌 ∧ ((2nd𝐹)‘𝑥) ∈ 𝑍))))
1514adantlr 714 . . . . 5 (((Fun 𝐹 ∧ ran 𝐹 ⊆ (V × V)) ∧ 𝑥 ∈ dom 𝐹) → ((𝐹𝑥) ∈ (𝑌 × 𝑍) ↔ ((𝐹𝑥) = ⟨((1st𝐹)‘𝑥), ((2nd𝐹)‘𝑥)⟩ ∧ (((1st𝐹)‘𝑥) ∈ 𝑌 ∧ ((2nd𝐹)‘𝑥) ∈ 𝑍))))
16 opfv 30404 . . . . . 6 (((Fun 𝐹 ∧ ran 𝐹 ⊆ (V × V)) ∧ 𝑥 ∈ dom 𝐹) → (𝐹𝑥) = ⟨((1st𝐹)‘𝑥), ((2nd𝐹)‘𝑥)⟩)
1716biantrurd 536 . . . . 5 (((Fun 𝐹 ∧ ran 𝐹 ⊆ (V × V)) ∧ 𝑥 ∈ dom 𝐹) → ((((1st𝐹)‘𝑥) ∈ 𝑌 ∧ ((2nd𝐹)‘𝑥) ∈ 𝑍) ↔ ((𝐹𝑥) = ⟨((1st𝐹)‘𝑥), ((2nd𝐹)‘𝑥)⟩ ∧ (((1st𝐹)‘𝑥) ∈ 𝑌 ∧ ((2nd𝐹)‘𝑥) ∈ 𝑍))))
18 fo1st 7704 . . . . . . . . . . 11 1st :V–onto→V
19 fofun 6582 . . . . . . . . . . 11 (1st :V–onto→V → Fun 1st )
2018, 19ax-mp 5 . . . . . . . . . 10 Fun 1st
21 funco 6383 . . . . . . . . . 10 ((Fun 1st ∧ Fun 𝐹) → Fun (1st𝐹))
2220, 21mpan 689 . . . . . . . . 9 (Fun 𝐹 → Fun (1st𝐹))
2322adantr 484 . . . . . . . 8 ((Fun 𝐹𝑥 ∈ dom 𝐹) → Fun (1st𝐹))
24 ssv 3977 . . . . . . . . . . . 12 (𝐹 “ dom 𝐹) ⊆ V
25 fof 6581 . . . . . . . . . . . . 13 (1st :V–onto→V → 1st :V⟶V)
26 fdm 6511 . . . . . . . . . . . . 13 (1st :V⟶V → dom 1st = V)
2718, 25, 26mp2b 10 . . . . . . . . . . . 12 dom 1st = V
2824, 27sseqtrri 3990 . . . . . . . . . . 11 (𝐹 “ dom 𝐹) ⊆ dom 1st
29 ssid 3975 . . . . . . . . . . . 12 dom 𝐹 ⊆ dom 𝐹
30 funimass3 6815 . . . . . . . . . . . 12 ((Fun 𝐹 ∧ dom 𝐹 ⊆ dom 𝐹) → ((𝐹 “ dom 𝐹) ⊆ dom 1st ↔ dom 𝐹 ⊆ (𝐹 “ dom 1st )))
3129, 30mpan2 690 . . . . . . . . . . 11 (Fun 𝐹 → ((𝐹 “ dom 𝐹) ⊆ dom 1st ↔ dom 𝐹 ⊆ (𝐹 “ dom 1st )))
3228, 31mpbii 236 . . . . . . . . . 10 (Fun 𝐹 → dom 𝐹 ⊆ (𝐹 “ dom 1st ))
3332sselda 3953 . . . . . . . . 9 ((Fun 𝐹𝑥 ∈ dom 𝐹) → 𝑥 ∈ (𝐹 “ dom 1st ))
34 dmco 6094 . . . . . . . . 9 dom (1st𝐹) = (𝐹 “ dom 1st )
3533, 34eleqtrrdi 2927 . . . . . . . 8 ((Fun 𝐹𝑥 ∈ dom 𝐹) → 𝑥 ∈ dom (1st𝐹))
36 fvimacnv 6814 . . . . . . . 8 ((Fun (1st𝐹) ∧ 𝑥 ∈ dom (1st𝐹)) → (((1st𝐹)‘𝑥) ∈ 𝑌𝑥 ∈ ((1st𝐹) “ 𝑌)))
3723, 35, 36syl2anc 587 . . . . . . 7 ((Fun 𝐹𝑥 ∈ dom 𝐹) → (((1st𝐹)‘𝑥) ∈ 𝑌𝑥 ∈ ((1st𝐹) “ 𝑌)))
38 fo2nd 7705 . . . . . . . . . . 11 2nd :V–onto→V
39 fofun 6582 . . . . . . . . . . 11 (2nd :V–onto→V → Fun 2nd )
4038, 39ax-mp 5 . . . . . . . . . 10 Fun 2nd
41 funco 6383 . . . . . . . . . 10 ((Fun 2nd ∧ Fun 𝐹) → Fun (2nd𝐹))
4240, 41mpan 689 . . . . . . . . 9 (Fun 𝐹 → Fun (2nd𝐹))
4342adantr 484 . . . . . . . 8 ((Fun 𝐹𝑥 ∈ dom 𝐹) → Fun (2nd𝐹))
44 fof 6581 . . . . . . . . . . . . 13 (2nd :V–onto→V → 2nd :V⟶V)
45 fdm 6511 . . . . . . . . . . . . 13 (2nd :V⟶V → dom 2nd = V)
4638, 44, 45mp2b 10 . . . . . . . . . . . 12 dom 2nd = V
4724, 46sseqtrri 3990 . . . . . . . . . . 11 (𝐹 “ dom 𝐹) ⊆ dom 2nd
48 funimass3 6815 . . . . . . . . . . . 12 ((Fun 𝐹 ∧ dom 𝐹 ⊆ dom 𝐹) → ((𝐹 “ dom 𝐹) ⊆ dom 2nd ↔ dom 𝐹 ⊆ (𝐹 “ dom 2nd )))
4929, 48mpan2 690 . . . . . . . . . . 11 (Fun 𝐹 → ((𝐹 “ dom 𝐹) ⊆ dom 2nd ↔ dom 𝐹 ⊆ (𝐹 “ dom 2nd )))
5047, 49mpbii 236 . . . . . . . . . 10 (Fun 𝐹 → dom 𝐹 ⊆ (𝐹 “ dom 2nd ))
5150sselda 3953 . . . . . . . . 9 ((Fun 𝐹𝑥 ∈ dom 𝐹) → 𝑥 ∈ (𝐹 “ dom 2nd ))
52 dmco 6094 . . . . . . . . 9 dom (2nd𝐹) = (𝐹 “ dom 2nd )
5351, 52eleqtrrdi 2927 . . . . . . . 8 ((Fun 𝐹𝑥 ∈ dom 𝐹) → 𝑥 ∈ dom (2nd𝐹))
54 fvimacnv 6814 . . . . . . . 8 ((Fun (2nd𝐹) ∧ 𝑥 ∈ dom (2nd𝐹)) → (((2nd𝐹)‘𝑥) ∈ 𝑍𝑥 ∈ ((2nd𝐹) “ 𝑍)))
5543, 53, 54syl2anc 587 . . . . . . 7 ((Fun 𝐹𝑥 ∈ dom 𝐹) → (((2nd𝐹)‘𝑥) ∈ 𝑍𝑥 ∈ ((2nd𝐹) “ 𝑍)))
5637, 55anbi12d 633 . . . . . 6 ((Fun 𝐹𝑥 ∈ dom 𝐹) → ((((1st𝐹)‘𝑥) ∈ 𝑌 ∧ ((2nd𝐹)‘𝑥) ∈ 𝑍) ↔ (𝑥 ∈ ((1st𝐹) “ 𝑌) ∧ 𝑥 ∈ ((2nd𝐹) “ 𝑍))))
5756adantlr 714 . . . . 5 (((Fun 𝐹 ∧ ran 𝐹 ⊆ (V × V)) ∧ 𝑥 ∈ dom 𝐹) → ((((1st𝐹)‘𝑥) ∈ 𝑌 ∧ ((2nd𝐹)‘𝑥) ∈ 𝑍) ↔ (𝑥 ∈ ((1st𝐹) “ 𝑌) ∧ 𝑥 ∈ ((2nd𝐹) “ 𝑍))))
5815, 17, 573bitr2d 310 . . . 4 (((Fun 𝐹 ∧ ran 𝐹 ⊆ (V × V)) ∧ 𝑥 ∈ dom 𝐹) → ((𝐹𝑥) ∈ (𝑌 × 𝑍) ↔ (𝑥 ∈ ((1st𝐹) “ 𝑌) ∧ 𝑥 ∈ ((2nd𝐹) “ 𝑍))))
5958rabbidva 3463 . . 3 ((Fun 𝐹 ∧ ran 𝐹 ⊆ (V × V)) → {𝑥 ∈ dom 𝐹 ∣ (𝐹𝑥) ∈ (𝑌 × 𝑍)} = {𝑥 ∈ dom 𝐹 ∣ (𝑥 ∈ ((1st𝐹) “ 𝑌) ∧ 𝑥 ∈ ((2nd𝐹) “ 𝑍))})
604, 59eqtrd 2859 . 2 ((Fun 𝐹 ∧ ran 𝐹 ⊆ (V × V)) → (𝐹 “ (𝑌 × 𝑍)) = {𝑥 ∈ dom 𝐹 ∣ (𝑥 ∈ ((1st𝐹) “ 𝑌) ∧ 𝑥 ∈ ((2nd𝐹) “ 𝑍))})
61 dfin5 3927 . . . 4 (dom 𝐹 ∩ ((1st𝐹) “ 𝑌)) = {𝑥 ∈ dom 𝐹𝑥 ∈ ((1st𝐹) “ 𝑌)}
62 dfin5 3927 . . . 4 (dom 𝐹 ∩ ((2nd𝐹) “ 𝑍)) = {𝑥 ∈ dom 𝐹𝑥 ∈ ((2nd𝐹) “ 𝑍)}
6361, 62ineq12i 4172 . . 3 ((dom 𝐹 ∩ ((1st𝐹) “ 𝑌)) ∩ (dom 𝐹 ∩ ((2nd𝐹) “ 𝑍))) = ({𝑥 ∈ dom 𝐹𝑥 ∈ ((1st𝐹) “ 𝑌)} ∩ {𝑥 ∈ dom 𝐹𝑥 ∈ ((2nd𝐹) “ 𝑍)})
64 cnvimass 5936 . . . . . 6 ((1st𝐹) “ 𝑌) ⊆ dom (1st𝐹)
65 dmcoss 5829 . . . . . 6 dom (1st𝐹) ⊆ dom 𝐹
6664, 65sstri 3962 . . . . 5 ((1st𝐹) “ 𝑌) ⊆ dom 𝐹
67 sseqin2 4177 . . . . 5 (((1st𝐹) “ 𝑌) ⊆ dom 𝐹 ↔ (dom 𝐹 ∩ ((1st𝐹) “ 𝑌)) = ((1st𝐹) “ 𝑌))
6866, 67mpbi 233 . . . 4 (dom 𝐹 ∩ ((1st𝐹) “ 𝑌)) = ((1st𝐹) “ 𝑌)
69 cnvimass 5936 . . . . . 6 ((2nd𝐹) “ 𝑍) ⊆ dom (2nd𝐹)
70 dmcoss 5829 . . . . . 6 dom (2nd𝐹) ⊆ dom 𝐹
7169, 70sstri 3962 . . . . 5 ((2nd𝐹) “ 𝑍) ⊆ dom 𝐹
72 sseqin2 4177 . . . . 5 (((2nd𝐹) “ 𝑍) ⊆ dom 𝐹 ↔ (dom 𝐹 ∩ ((2nd𝐹) “ 𝑍)) = ((2nd𝐹) “ 𝑍))
7371, 72mpbi 233 . . . 4 (dom 𝐹 ∩ ((2nd𝐹) “ 𝑍)) = ((2nd𝐹) “ 𝑍)
7468, 73ineq12i 4172 . . 3 ((dom 𝐹 ∩ ((1st𝐹) “ 𝑌)) ∩ (dom 𝐹 ∩ ((2nd𝐹) “ 𝑍))) = (((1st𝐹) “ 𝑌) ∩ ((2nd𝐹) “ 𝑍))
75 inrab 4260 . . 3 ({𝑥 ∈ dom 𝐹𝑥 ∈ ((1st𝐹) “ 𝑌)} ∩ {𝑥 ∈ dom 𝐹𝑥 ∈ ((2nd𝐹) “ 𝑍)}) = {𝑥 ∈ dom 𝐹 ∣ (𝑥 ∈ ((1st𝐹) “ 𝑌) ∧ 𝑥 ∈ ((2nd𝐹) “ 𝑍))}
7663, 74, 753eqtr3ri 2856 . 2 {𝑥 ∈ dom 𝐹 ∣ (𝑥 ∈ ((1st𝐹) “ 𝑌) ∧ 𝑥 ∈ ((2nd𝐹) “ 𝑍))} = (((1st𝐹) “ 𝑌) ∩ ((2nd𝐹) “ 𝑍))
7760, 76syl6eq 2875 1 ((Fun 𝐹 ∧ ran 𝐹 ⊆ (V × V)) → (𝐹 “ (𝑌 × 𝑍)) = (((1st𝐹) “ 𝑌) ∩ ((2nd𝐹) “ 𝑍)))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 209   ∧ wa 399   = wceq 1538   ∈ wcel 2115  {crab 3137  Vcvv 3480   ∩ cin 3918   ⊆ wss 3919  ⟨cop 4556   × cxp 5540  ◡ccnv 5541  dom cdm 5542  ran crn 5543   “ cima 5545   ∘ ccom 5546  Fun wfun 6337   Fn wfn 6338  ⟶wf 6339  –onto→wfo 6341  ‘cfv 6343  1st c1st 7682  2nd c2nd 7683 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 2179  ax-ext 2796  ax-sep 5189  ax-nul 5196  ax-pow 5253  ax-pr 5317  ax-un 7455 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 2624  df-eu 2655  df-clab 2803  df-cleq 2817  df-clel 2896  df-nfc 2964  df-ne 3015  df-ral 3138  df-rex 3139  df-rab 3142  df-v 3482  df-sbc 3759  df-dif 3922  df-un 3924  df-in 3926  df-ss 3936  df-nul 4277  df-if 4451  df-sn 4551  df-pr 4553  df-op 4557  df-uni 4825  df-br 5053  df-opab 5115  df-mpt 5133  df-id 5447  df-xp 5548  df-rel 5549  df-cnv 5550  df-co 5551  df-dm 5552  df-rn 5553  df-res 5554  df-ima 5555  df-iota 6302  df-fun 6345  df-fn 6346  df-f 6347  df-fo 6349  df-fv 6351  df-1st 7684  df-2nd 7685 This theorem is referenced by:  xppreima2  30406
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