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Theorem xpwdomg 8645
Description: Weak dominance of a Cartesian product. (Contributed by Stefan O'Rear, 13-Feb-2015.) (Revised by Mario Carneiro, 25-Jun-2015.)
Assertion
Ref Expression
xpwdomg ((𝐴* 𝐵𝐶* 𝐷) → (𝐴 × 𝐶) ≼* (𝐵 × 𝐷))

Proof of Theorem xpwdomg
Dummy variables 𝑎 𝑏 𝑐 𝑓 𝑔 𝑥 𝑦 𝑑 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 brwdom3i 8643 . . 3 (𝐴* 𝐵 → ∃𝑓𝑎𝐴𝑏𝐵 𝑎 = (𝑓𝑏))
21adantr 466 . 2 ((𝐴* 𝐵𝐶* 𝐷) → ∃𝑓𝑎𝐴𝑏𝐵 𝑎 = (𝑓𝑏))
3 brwdom3i 8643 . . 3 (𝐶* 𝐷 → ∃𝑔𝑐𝐶𝑑𝐷 𝑐 = (𝑔𝑑))
43adantl 467 . 2 ((𝐴* 𝐵𝐶* 𝐷) → ∃𝑔𝑐𝐶𝑑𝐷 𝑐 = (𝑔𝑑))
5 relwdom 8626 . . . . . . . . . 10 Rel ≼*
65brrelexi 5298 . . . . . . . . 9 (𝐴* 𝐵𝐴 ∈ V)
75brrelexi 5298 . . . . . . . . 9 (𝐶* 𝐷𝐶 ∈ V)
8 xpexg 7106 . . . . . . . . 9 ((𝐴 ∈ V ∧ 𝐶 ∈ V) → (𝐴 × 𝐶) ∈ V)
96, 7, 8syl2an 575 . . . . . . . 8 ((𝐴* 𝐵𝐶* 𝐷) → (𝐴 × 𝐶) ∈ V)
109adantr 466 . . . . . . 7 (((𝐴* 𝐵𝐶* 𝐷) ∧ (∀𝑎𝐴𝑏𝐵 𝑎 = (𝑓𝑏) ∧ ∀𝑐𝐶𝑑𝐷 𝑐 = (𝑔𝑑))) → (𝐴 × 𝐶) ∈ V)
115brrelex2i 5299 . . . . . . . . 9 (𝐴* 𝐵𝐵 ∈ V)
125brrelex2i 5299 . . . . . . . . 9 (𝐶* 𝐷𝐷 ∈ V)
13 xpexg 7106 . . . . . . . . 9 ((𝐵 ∈ V ∧ 𝐷 ∈ V) → (𝐵 × 𝐷) ∈ V)
1411, 12, 13syl2an 575 . . . . . . . 8 ((𝐴* 𝐵𝐶* 𝐷) → (𝐵 × 𝐷) ∈ V)
1514adantr 466 . . . . . . 7 (((𝐴* 𝐵𝐶* 𝐷) ∧ (∀𝑎𝐴𝑏𝐵 𝑎 = (𝑓𝑏) ∧ ∀𝑐𝐶𝑑𝐷 𝑐 = (𝑔𝑑))) → (𝐵 × 𝐷) ∈ V)
16 pm3.2 446 . . . . . . . . . . . . . . . 16 (∃𝑏𝐵 𝑎 = (𝑓𝑏) → (∃𝑑𝐷 𝑐 = (𝑔𝑑) → (∃𝑏𝐵 𝑎 = (𝑓𝑏) ∧ ∃𝑑𝐷 𝑐 = (𝑔𝑑))))
1716ralimdv 3111 . . . . . . . . . . . . . . 15 (∃𝑏𝐵 𝑎 = (𝑓𝑏) → (∀𝑐𝐶𝑑𝐷 𝑐 = (𝑔𝑑) → ∀𝑐𝐶 (∃𝑏𝐵 𝑎 = (𝑓𝑏) ∧ ∃𝑑𝐷 𝑐 = (𝑔𝑑))))
1817com12 32 . . . . . . . . . . . . . 14 (∀𝑐𝐶𝑑𝐷 𝑐 = (𝑔𝑑) → (∃𝑏𝐵 𝑎 = (𝑓𝑏) → ∀𝑐𝐶 (∃𝑏𝐵 𝑎 = (𝑓𝑏) ∧ ∃𝑑𝐷 𝑐 = (𝑔𝑑))))
1918ralimdv 3111 . . . . . . . . . . . . 13 (∀𝑐𝐶𝑑𝐷 𝑐 = (𝑔𝑑) → (∀𝑎𝐴𝑏𝐵 𝑎 = (𝑓𝑏) → ∀𝑎𝐴𝑐𝐶 (∃𝑏𝐵 𝑎 = (𝑓𝑏) ∧ ∃𝑑𝐷 𝑐 = (𝑔𝑑))))
2019impcom 394 . . . . . . . . . . . 12 ((∀𝑎𝐴𝑏𝐵 𝑎 = (𝑓𝑏) ∧ ∀𝑐𝐶𝑑𝐷 𝑐 = (𝑔𝑑)) → ∀𝑎𝐴𝑐𝐶 (∃𝑏𝐵 𝑎 = (𝑓𝑏) ∧ ∃𝑑𝐷 𝑐 = (𝑔𝑑)))
21 pm3.2 446 . . . . . . . . . . . . . . . . 17 (𝑎 = (𝑓𝑏) → (𝑐 = (𝑔𝑑) → (𝑎 = (𝑓𝑏) ∧ 𝑐 = (𝑔𝑑))))
2221reximdv 3163 . . . . . . . . . . . . . . . 16 (𝑎 = (𝑓𝑏) → (∃𝑑𝐷 𝑐 = (𝑔𝑑) → ∃𝑑𝐷 (𝑎 = (𝑓𝑏) ∧ 𝑐 = (𝑔𝑑))))
2322com12 32 . . . . . . . . . . . . . . 15 (∃𝑑𝐷 𝑐 = (𝑔𝑑) → (𝑎 = (𝑓𝑏) → ∃𝑑𝐷 (𝑎 = (𝑓𝑏) ∧ 𝑐 = (𝑔𝑑))))
2423reximdv 3163 . . . . . . . . . . . . . 14 (∃𝑑𝐷 𝑐 = (𝑔𝑑) → (∃𝑏𝐵 𝑎 = (𝑓𝑏) → ∃𝑏𝐵𝑑𝐷 (𝑎 = (𝑓𝑏) ∧ 𝑐 = (𝑔𝑑))))
2524impcom 394 . . . . . . . . . . . . 13 ((∃𝑏𝐵 𝑎 = (𝑓𝑏) ∧ ∃𝑑𝐷 𝑐 = (𝑔𝑑)) → ∃𝑏𝐵𝑑𝐷 (𝑎 = (𝑓𝑏) ∧ 𝑐 = (𝑔𝑑)))
26252ralimi 3101 . . . . . . . . . . . 12 (∀𝑎𝐴𝑐𝐶 (∃𝑏𝐵 𝑎 = (𝑓𝑏) ∧ ∃𝑑𝐷 𝑐 = (𝑔𝑑)) → ∀𝑎𝐴𝑐𝐶𝑏𝐵𝑑𝐷 (𝑎 = (𝑓𝑏) ∧ 𝑐 = (𝑔𝑑)))
2720, 26syl 17 . . . . . . . . . . 11 ((∀𝑎𝐴𝑏𝐵 𝑎 = (𝑓𝑏) ∧ ∀𝑐𝐶𝑑𝐷 𝑐 = (𝑔𝑑)) → ∀𝑎𝐴𝑐𝐶𝑏𝐵𝑑𝐷 (𝑎 = (𝑓𝑏) ∧ 𝑐 = (𝑔𝑑)))
28 eqeq1 2774 . . . . . . . . . . . . . 14 (𝑥 = ⟨𝑎, 𝑐⟩ → (𝑥 = ⟨(𝑓𝑏), (𝑔𝑑)⟩ ↔ ⟨𝑎, 𝑐⟩ = ⟨(𝑓𝑏), (𝑔𝑑)⟩))
29 vex 3352 . . . . . . . . . . . . . . 15 𝑎 ∈ V
30 vex 3352 . . . . . . . . . . . . . . 15 𝑐 ∈ V
3129, 30opth 5072 . . . . . . . . . . . . . 14 (⟨𝑎, 𝑐⟩ = ⟨(𝑓𝑏), (𝑔𝑑)⟩ ↔ (𝑎 = (𝑓𝑏) ∧ 𝑐 = (𝑔𝑑)))
3228, 31syl6bb 276 . . . . . . . . . . . . 13 (𝑥 = ⟨𝑎, 𝑐⟩ → (𝑥 = ⟨(𝑓𝑏), (𝑔𝑑)⟩ ↔ (𝑎 = (𝑓𝑏) ∧ 𝑐 = (𝑔𝑑))))
33322rexbidv 3204 . . . . . . . . . . . 12 (𝑥 = ⟨𝑎, 𝑐⟩ → (∃𝑏𝐵𝑑𝐷 𝑥 = ⟨(𝑓𝑏), (𝑔𝑑)⟩ ↔ ∃𝑏𝐵𝑑𝐷 (𝑎 = (𝑓𝑏) ∧ 𝑐 = (𝑔𝑑))))
3433ralxp 5402 . . . . . . . . . . 11 (∀𝑥 ∈ (𝐴 × 𝐶)∃𝑏𝐵𝑑𝐷 𝑥 = ⟨(𝑓𝑏), (𝑔𝑑)⟩ ↔ ∀𝑎𝐴𝑐𝐶𝑏𝐵𝑑𝐷 (𝑎 = (𝑓𝑏) ∧ 𝑐 = (𝑔𝑑)))
3527, 34sylibr 224 . . . . . . . . . 10 ((∀𝑎𝐴𝑏𝐵 𝑎 = (𝑓𝑏) ∧ ∀𝑐𝐶𝑑𝐷 𝑐 = (𝑔𝑑)) → ∀𝑥 ∈ (𝐴 × 𝐶)∃𝑏𝐵𝑑𝐷 𝑥 = ⟨(𝑓𝑏), (𝑔𝑑)⟩)
3635r19.21bi 3080 . . . . . . . . 9 (((∀𝑎𝐴𝑏𝐵 𝑎 = (𝑓𝑏) ∧ ∀𝑐𝐶𝑑𝐷 𝑐 = (𝑔𝑑)) ∧ 𝑥 ∈ (𝐴 × 𝐶)) → ∃𝑏𝐵𝑑𝐷 𝑥 = ⟨(𝑓𝑏), (𝑔𝑑)⟩)
37 vex 3352 . . . . . . . . . . . . . 14 𝑏 ∈ V
38 vex 3352 . . . . . . . . . . . . . 14 𝑑 ∈ V
3937, 38op1std 7324 . . . . . . . . . . . . 13 (𝑦 = ⟨𝑏, 𝑑⟩ → (1st𝑦) = 𝑏)
4039fveq2d 6336 . . . . . . . . . . . 12 (𝑦 = ⟨𝑏, 𝑑⟩ → (𝑓‘(1st𝑦)) = (𝑓𝑏))
4137, 38op2ndd 7325 . . . . . . . . . . . . 13 (𝑦 = ⟨𝑏, 𝑑⟩ → (2nd𝑦) = 𝑑)
4241fveq2d 6336 . . . . . . . . . . . 12 (𝑦 = ⟨𝑏, 𝑑⟩ → (𝑔‘(2nd𝑦)) = (𝑔𝑑))
4340, 42opeq12d 4545 . . . . . . . . . . 11 (𝑦 = ⟨𝑏, 𝑑⟩ → ⟨(𝑓‘(1st𝑦)), (𝑔‘(2nd𝑦))⟩ = ⟨(𝑓𝑏), (𝑔𝑑)⟩)
4443eqeq2d 2780 . . . . . . . . . 10 (𝑦 = ⟨𝑏, 𝑑⟩ → (𝑥 = ⟨(𝑓‘(1st𝑦)), (𝑔‘(2nd𝑦))⟩ ↔ 𝑥 = ⟨(𝑓𝑏), (𝑔𝑑)⟩))
4544rexxp 5403 . . . . . . . . 9 (∃𝑦 ∈ (𝐵 × 𝐷)𝑥 = ⟨(𝑓‘(1st𝑦)), (𝑔‘(2nd𝑦))⟩ ↔ ∃𝑏𝐵𝑑𝐷 𝑥 = ⟨(𝑓𝑏), (𝑔𝑑)⟩)
4636, 45sylibr 224 . . . . . . . 8 (((∀𝑎𝐴𝑏𝐵 𝑎 = (𝑓𝑏) ∧ ∀𝑐𝐶𝑑𝐷 𝑐 = (𝑔𝑑)) ∧ 𝑥 ∈ (𝐴 × 𝐶)) → ∃𝑦 ∈ (𝐵 × 𝐷)𝑥 = ⟨(𝑓‘(1st𝑦)), (𝑔‘(2nd𝑦))⟩)
4746adantll 685 . . . . . . 7 ((((𝐴* 𝐵𝐶* 𝐷) ∧ (∀𝑎𝐴𝑏𝐵 𝑎 = (𝑓𝑏) ∧ ∀𝑐𝐶𝑑𝐷 𝑐 = (𝑔𝑑))) ∧ 𝑥 ∈ (𝐴 × 𝐶)) → ∃𝑦 ∈ (𝐵 × 𝐷)𝑥 = ⟨(𝑓‘(1st𝑦)), (𝑔‘(2nd𝑦))⟩)
4810, 15, 47wdom2d 8640 . . . . . 6 (((𝐴* 𝐵𝐶* 𝐷) ∧ (∀𝑎𝐴𝑏𝐵 𝑎 = (𝑓𝑏) ∧ ∀𝑐𝐶𝑑𝐷 𝑐 = (𝑔𝑑))) → (𝐴 × 𝐶) ≼* (𝐵 × 𝐷))
4948expr 444 . . . . 5 (((𝐴* 𝐵𝐶* 𝐷) ∧ ∀𝑎𝐴𝑏𝐵 𝑎 = (𝑓𝑏)) → (∀𝑐𝐶𝑑𝐷 𝑐 = (𝑔𝑑) → (𝐴 × 𝐶) ≼* (𝐵 × 𝐷)))
5049exlimdv 2012 . . . 4 (((𝐴* 𝐵𝐶* 𝐷) ∧ ∀𝑎𝐴𝑏𝐵 𝑎 = (𝑓𝑏)) → (∃𝑔𝑐𝐶𝑑𝐷 𝑐 = (𝑔𝑑) → (𝐴 × 𝐶) ≼* (𝐵 × 𝐷)))
5150ex 397 . . 3 ((𝐴* 𝐵𝐶* 𝐷) → (∀𝑎𝐴𝑏𝐵 𝑎 = (𝑓𝑏) → (∃𝑔𝑐𝐶𝑑𝐷 𝑐 = (𝑔𝑑) → (𝐴 × 𝐶) ≼* (𝐵 × 𝐷))))
5251exlimdv 2012 . 2 ((𝐴* 𝐵𝐶* 𝐷) → (∃𝑓𝑎𝐴𝑏𝐵 𝑎 = (𝑓𝑏) → (∃𝑔𝑐𝐶𝑑𝐷 𝑐 = (𝑔𝑑) → (𝐴 × 𝐶) ≼* (𝐵 × 𝐷))))
532, 4, 52mp2d 49 1 ((𝐴* 𝐵𝐶* 𝐷) → (𝐴 × 𝐶) ≼* (𝐵 × 𝐷))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 382   = wceq 1630  wex 1851  wcel 2144  wral 3060  wrex 3061  Vcvv 3349  cop 4320   class class class wbr 4784   × cxp 5247  cfv 6031  1st c1st 7312  2nd c2nd 7313  * cwdom 8617
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1869  ax-4 1884  ax-5 1990  ax-6 2056  ax-7 2092  ax-8 2146  ax-9 2153  ax-10 2173  ax-11 2189  ax-12 2202  ax-13 2407  ax-ext 2750  ax-sep 4912  ax-nul 4920  ax-pow 4971  ax-pr 5034  ax-un 7095
This theorem depends on definitions:  df-bi 197  df-an 383  df-or 827  df-3an 1072  df-tru 1633  df-ex 1852  df-nf 1857  df-sb 2049  df-eu 2621  df-mo 2622  df-clab 2757  df-cleq 2763  df-clel 2766  df-nfc 2901  df-ne 2943  df-ral 3065  df-rex 3066  df-rab 3069  df-v 3351  df-sbc 3586  df-csb 3681  df-dif 3724  df-un 3726  df-in 3728  df-ss 3735  df-nul 4062  df-if 4224  df-pw 4297  df-sn 4315  df-pr 4317  df-op 4321  df-uni 4573  df-iun 4654  df-br 4785  df-opab 4845  df-mpt 4862  df-id 5157  df-xp 5255  df-rel 5256  df-cnv 5257  df-co 5258  df-dm 5259  df-rn 5260  df-res 5261  df-ima 5262  df-iota 5994  df-fun 6033  df-fn 6034  df-f 6035  df-f1 6036  df-fo 6037  df-f1o 6038  df-fv 6039  df-1st 7314  df-2nd 7315  df-er 7895  df-en 8109  df-dom 8110  df-sdom 8111  df-wdom 8619
This theorem is referenced by:  hsmexlem3  9451
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