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Theorem unxpwdom2 9044
 Description: Lemma for unxpwdom 9045. (Contributed by Mario Carneiro, 15-May-2015.)
Assertion
Ref Expression
unxpwdom2 ((𝐴 × 𝐴) ≈ (𝐵𝐶) → (𝐴* 𝐵𝐴𝐶))

Proof of Theorem unxpwdom2
Dummy variables 𝑥 𝑓 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 ensym 8550 . 2 ((𝐴 × 𝐴) ≈ (𝐵𝐶) → (𝐵𝐶) ≈ (𝐴 × 𝐴))
2 bren 8510 . . 3 ((𝐵𝐶) ≈ (𝐴 × 𝐴) ↔ ∃𝑓 𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴))
3 ssdif0 4321 . . . . . 6 (𝐴 ⊆ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵) ↔ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵)) = ∅)
4 dmxpid 5793 . . . . . . . . . . . . . 14 dom (𝐴 × 𝐴) = 𝐴
5 f1ofo 6615 . . . . . . . . . . . . . . . . 17 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → 𝑓:(𝐵𝐶)–onto→(𝐴 × 𝐴))
6 forn 6586 . . . . . . . . . . . . . . . . 17 (𝑓:(𝐵𝐶)–onto→(𝐴 × 𝐴) → ran 𝑓 = (𝐴 × 𝐴))
75, 6syl 17 . . . . . . . . . . . . . . . 16 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → ran 𝑓 = (𝐴 × 𝐴))
8 vex 3496 . . . . . . . . . . . . . . . . 17 𝑓 ∈ V
98rnex 7609 . . . . . . . . . . . . . . . 16 ran 𝑓 ∈ V
107, 9eqeltrrdi 2920 . . . . . . . . . . . . . . 15 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → (𝐴 × 𝐴) ∈ V)
1110dmexd 7607 . . . . . . . . . . . . . 14 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → dom (𝐴 × 𝐴) ∈ V)
124, 11eqeltrrid 2916 . . . . . . . . . . . . 13 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → 𝐴 ∈ V)
13 imassrn 5933 . . . . . . . . . . . . . 14 (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵) ⊆ ran ((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓)
14 f1stres 7705 . . . . . . . . . . . . . . . 16 (1st ↾ (𝐴 × 𝐴)):(𝐴 × 𝐴)⟶𝐴
15 f1of 6608 . . . . . . . . . . . . . . . 16 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → 𝑓:(𝐵𝐶)⟶(𝐴 × 𝐴))
16 fco 6524 . . . . . . . . . . . . . . . 16 (((1st ↾ (𝐴 × 𝐴)):(𝐴 × 𝐴)⟶𝐴𝑓:(𝐵𝐶)⟶(𝐴 × 𝐴)) → ((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓):(𝐵𝐶)⟶𝐴)
1714, 15, 16sylancr 589 . . . . . . . . . . . . . . 15 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → ((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓):(𝐵𝐶)⟶𝐴)
1817frnd 6514 . . . . . . . . . . . . . 14 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → ran ((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) ⊆ 𝐴)
1913, 18sstrid 3976 . . . . . . . . . . . . 13 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵) ⊆ 𝐴)
2012, 19ssexd 5219 . . . . . . . . . . . 12 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵) ∈ V)
2120adantr 483 . . . . . . . . . . 11 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝐴 ⊆ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵)) → (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵) ∈ V)
22 simpr 487 . . . . . . . . . . 11 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝐴 ⊆ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵)) → 𝐴 ⊆ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))
23 ssdomg 8547 . . . . . . . . . . 11 ((((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵) ∈ V → (𝐴 ⊆ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵) → 𝐴 ≼ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵)))
2421, 22, 23sylc 65 . . . . . . . . . 10 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝐴 ⊆ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵)) → 𝐴 ≼ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))
25 domwdom 9030 . . . . . . . . . 10 (𝐴 ≼ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵) → 𝐴* (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))
2624, 25syl 17 . . . . . . . . 9 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝐴 ⊆ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵)) → 𝐴* (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))
2717ffund 6511 . . . . . . . . . . 11 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → Fun ((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓))
28 ssun1 4146 . . . . . . . . . . . 12 𝐵 ⊆ (𝐵𝐶)
29 f1odm 6612 . . . . . . . . . . . . 13 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → dom 𝑓 = (𝐵𝐶))
308dmex 7608 . . . . . . . . . . . . 13 dom 𝑓 ∈ V
3129, 30eqeltrrdi 2920 . . . . . . . . . . . 12 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → (𝐵𝐶) ∈ V)
32 ssexg 5218 . . . . . . . . . . . 12 ((𝐵 ⊆ (𝐵𝐶) ∧ (𝐵𝐶) ∈ V) → 𝐵 ∈ V)
3328, 31, 32sylancr 589 . . . . . . . . . . 11 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → 𝐵 ∈ V)
34 wdomima2g 9042 . . . . . . . . . . 11 ((Fun ((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) ∧ 𝐵 ∈ V ∧ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵) ∈ V) → (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵) ≼* 𝐵)
3527, 33, 20, 34syl3anc 1365 . . . . . . . . . 10 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵) ≼* 𝐵)
3635adantr 483 . . . . . . . . 9 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝐴 ⊆ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵)) → (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵) ≼* 𝐵)
37 wdomtr 9031 . . . . . . . . 9 ((𝐴* (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵) ∧ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵) ≼* 𝐵) → 𝐴* 𝐵)
3826, 36, 37syl2anc 586 . . . . . . . 8 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝐴 ⊆ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵)) → 𝐴* 𝐵)
3938orcd 871 . . . . . . 7 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝐴 ⊆ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵)) → (𝐴* 𝐵𝐴𝐶))
4039ex 415 . . . . . 6 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → (𝐴 ⊆ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵) → (𝐴* 𝐵𝐴𝐶)))
413, 40syl5bir 245 . . . . 5 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → ((𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵)) = ∅ → (𝐴* 𝐵𝐴𝐶)))
42 n0 4308 . . . . . 6 ((𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵)) ≠ ∅ ↔ ∃𝑥 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵)))
43 ssun2 4147 . . . . . . . . . . . . 13 𝐶 ⊆ (𝐵𝐶)
44 ssexg 5218 . . . . . . . . . . . . 13 ((𝐶 ⊆ (𝐵𝐶) ∧ (𝐵𝐶) ∈ V) → 𝐶 ∈ V)
4543, 31, 44sylancr 589 . . . . . . . . . . . 12 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → 𝐶 ∈ V)
4645adantr 483 . . . . . . . . . . 11 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) → 𝐶 ∈ V)
47 f1ofn 6609 . . . . . . . . . . . . . . 15 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → 𝑓 Fn (𝐵𝐶))
48 elpreima 6821 . . . . . . . . . . . . . . 15 (𝑓 Fn (𝐵𝐶) → (𝑦 ∈ (𝑓 “ ({𝑥} × 𝐴)) ↔ (𝑦 ∈ (𝐵𝐶) ∧ (𝑓𝑦) ∈ ({𝑥} × 𝐴))))
4947, 48syl 17 . . . . . . . . . . . . . 14 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → (𝑦 ∈ (𝑓 “ ({𝑥} × 𝐴)) ↔ (𝑦 ∈ (𝐵𝐶) ∧ (𝑓𝑦) ∈ ({𝑥} × 𝐴))))
5049adantr 483 . . . . . . . . . . . . 13 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) → (𝑦 ∈ (𝑓 “ ({𝑥} × 𝐴)) ↔ (𝑦 ∈ (𝐵𝐶) ∧ (𝑓𝑦) ∈ ({𝑥} × 𝐴))))
51 elun 4123 . . . . . . . . . . . . . . . 16 (𝑦 ∈ (𝐵𝐶) ↔ (𝑦𝐵𝑦𝐶))
52 df-or 844 . . . . . . . . . . . . . . . 16 ((𝑦𝐵𝑦𝐶) ↔ (¬ 𝑦𝐵𝑦𝐶))
5351, 52bitri 277 . . . . . . . . . . . . . . 15 (𝑦 ∈ (𝐵𝐶) ↔ (¬ 𝑦𝐵𝑦𝐶))
54 eldifn 4102 . . . . . . . . . . . . . . . . . . 19 (𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵)) → ¬ 𝑥 ∈ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))
5554ad2antlr 725 . . . . . . . . . . . . . . . . . 18 (((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) ∧ (𝑓𝑦) ∈ ({𝑥} × 𝐴)) → ¬ 𝑥 ∈ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))
5615ad2antrr 724 . . . . . . . . . . . . . . . . . . . . . 22 (((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) ∧ ((𝑓𝑦) ∈ ({𝑥} × 𝐴) ∧ 𝑦𝐵)) → 𝑓:(𝐵𝐶)⟶(𝐴 × 𝐴))
57 simprr 771 . . . . . . . . . . . . . . . . . . . . . . 23 (((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) ∧ ((𝑓𝑦) ∈ ({𝑥} × 𝐴) ∧ 𝑦𝐵)) → 𝑦𝐵)
5828, 57sseldi 3963 . . . . . . . . . . . . . . . . . . . . . 22 (((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) ∧ ((𝑓𝑦) ∈ ({𝑥} × 𝐴) ∧ 𝑦𝐵)) → 𝑦 ∈ (𝐵𝐶))
59 fvco3 6753 . . . . . . . . . . . . . . . . . . . . . 22 ((𝑓:(𝐵𝐶)⟶(𝐴 × 𝐴) ∧ 𝑦 ∈ (𝐵𝐶)) → (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓)‘𝑦) = ((1st ↾ (𝐴 × 𝐴))‘(𝑓𝑦)))
6056, 58, 59syl2anc 586 . . . . . . . . . . . . . . . . . . . . 21 (((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) ∧ ((𝑓𝑦) ∈ ({𝑥} × 𝐴) ∧ 𝑦𝐵)) → (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓)‘𝑦) = ((1st ↾ (𝐴 × 𝐴))‘(𝑓𝑦)))
61 eldifi 4101 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 (𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵)) → 𝑥𝐴)
6261adantl 484 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) → 𝑥𝐴)
6362snssd 4734 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) → {𝑥} ⊆ 𝐴)
64 xpss1 5567 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 ({𝑥} ⊆ 𝐴 → ({𝑥} × 𝐴) ⊆ (𝐴 × 𝐴))
6563, 64syl 17 . . . . . . . . . . . . . . . . . . . . . . . . . 26 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) → ({𝑥} × 𝐴) ⊆ (𝐴 × 𝐴))
6665adantr 483 . . . . . . . . . . . . . . . . . . . . . . . . 25 (((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) ∧ ((𝑓𝑦) ∈ ({𝑥} × 𝐴) ∧ 𝑦𝐵)) → ({𝑥} × 𝐴) ⊆ (𝐴 × 𝐴))
67 simprl 769 . . . . . . . . . . . . . . . . . . . . . . . . 25 (((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) ∧ ((𝑓𝑦) ∈ ({𝑥} × 𝐴) ∧ 𝑦𝐵)) → (𝑓𝑦) ∈ ({𝑥} × 𝐴))
6866, 67sseldd 3966 . . . . . . . . . . . . . . . . . . . . . . . 24 (((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) ∧ ((𝑓𝑦) ∈ ({𝑥} × 𝐴) ∧ 𝑦𝐵)) → (𝑓𝑦) ∈ (𝐴 × 𝐴))
6968fvresd 6683 . . . . . . . . . . . . . . . . . . . . . . 23 (((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) ∧ ((𝑓𝑦) ∈ ({𝑥} × 𝐴) ∧ 𝑦𝐵)) → ((1st ↾ (𝐴 × 𝐴))‘(𝑓𝑦)) = (1st ‘(𝑓𝑦)))
70 xp1st 7713 . . . . . . . . . . . . . . . . . . . . . . . 24 ((𝑓𝑦) ∈ ({𝑥} × 𝐴) → (1st ‘(𝑓𝑦)) ∈ {𝑥})
7167, 70syl 17 . . . . . . . . . . . . . . . . . . . . . . 23 (((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) ∧ ((𝑓𝑦) ∈ ({𝑥} × 𝐴) ∧ 𝑦𝐵)) → (1st ‘(𝑓𝑦)) ∈ {𝑥})
7269, 71eqeltrd 2911 . . . . . . . . . . . . . . . . . . . . . 22 (((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) ∧ ((𝑓𝑦) ∈ ({𝑥} × 𝐴) ∧ 𝑦𝐵)) → ((1st ↾ (𝐴 × 𝐴))‘(𝑓𝑦)) ∈ {𝑥})
73 elsni 4576 . . . . . . . . . . . . . . . . . . . . . 22 (((1st ↾ (𝐴 × 𝐴))‘(𝑓𝑦)) ∈ {𝑥} → ((1st ↾ (𝐴 × 𝐴))‘(𝑓𝑦)) = 𝑥)
7472, 73syl 17 . . . . . . . . . . . . . . . . . . . . 21 (((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) ∧ ((𝑓𝑦) ∈ ({𝑥} × 𝐴) ∧ 𝑦𝐵)) → ((1st ↾ (𝐴 × 𝐴))‘(𝑓𝑦)) = 𝑥)
7560, 74eqtrd 2854 . . . . . . . . . . . . . . . . . . . 20 (((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) ∧ ((𝑓𝑦) ∈ ({𝑥} × 𝐴) ∧ 𝑦𝐵)) → (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓)‘𝑦) = 𝑥)
7617ffnd 6508 . . . . . . . . . . . . . . . . . . . . . 22 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → ((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) Fn (𝐵𝐶))
7776ad2antrr 724 . . . . . . . . . . . . . . . . . . . . 21 (((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) ∧ ((𝑓𝑦) ∈ ({𝑥} × 𝐴) ∧ 𝑦𝐵)) → ((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) Fn (𝐵𝐶))
7828a1i 11 . . . . . . . . . . . . . . . . . . . . 21 (((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) ∧ ((𝑓𝑦) ∈ ({𝑥} × 𝐴) ∧ 𝑦𝐵)) → 𝐵 ⊆ (𝐵𝐶))
79 fnfvima 6987 . . . . . . . . . . . . . . . . . . . . 21 ((((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) Fn (𝐵𝐶) ∧ 𝐵 ⊆ (𝐵𝐶) ∧ 𝑦𝐵) → (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓)‘𝑦) ∈ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))
8077, 78, 57, 79syl3anc 1365 . . . . . . . . . . . . . . . . . . . 20 (((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) ∧ ((𝑓𝑦) ∈ ({𝑥} × 𝐴) ∧ 𝑦𝐵)) → (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓)‘𝑦) ∈ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))
8175, 80eqeltrrd 2912 . . . . . . . . . . . . . . . . . . 19 (((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) ∧ ((𝑓𝑦) ∈ ({𝑥} × 𝐴) ∧ 𝑦𝐵)) → 𝑥 ∈ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))
8281expr 459 . . . . . . . . . . . . . . . . . 18 (((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) ∧ (𝑓𝑦) ∈ ({𝑥} × 𝐴)) → (𝑦𝐵𝑥 ∈ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵)))
8355, 82mtod 200 . . . . . . . . . . . . . . . . 17 (((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) ∧ (𝑓𝑦) ∈ ({𝑥} × 𝐴)) → ¬ 𝑦𝐵)
8483ex 415 . . . . . . . . . . . . . . . 16 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) → ((𝑓𝑦) ∈ ({𝑥} × 𝐴) → ¬ 𝑦𝐵))
8584imim1d 82 . . . . . . . . . . . . . . 15 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) → ((¬ 𝑦𝐵𝑦𝐶) → ((𝑓𝑦) ∈ ({𝑥} × 𝐴) → 𝑦𝐶)))
8653, 85syl5bi 244 . . . . . . . . . . . . . 14 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) → (𝑦 ∈ (𝐵𝐶) → ((𝑓𝑦) ∈ ({𝑥} × 𝐴) → 𝑦𝐶)))
8786impd 413 . . . . . . . . . . . . 13 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) → ((𝑦 ∈ (𝐵𝐶) ∧ (𝑓𝑦) ∈ ({𝑥} × 𝐴)) → 𝑦𝐶))
8850, 87sylbid 242 . . . . . . . . . . . 12 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) → (𝑦 ∈ (𝑓 “ ({𝑥} × 𝐴)) → 𝑦𝐶))
8988ssrdv 3971 . . . . . . . . . . 11 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) → (𝑓 “ ({𝑥} × 𝐴)) ⊆ 𝐶)
90 ssdomg 8547 . . . . . . . . . . 11 (𝐶 ∈ V → ((𝑓 “ ({𝑥} × 𝐴)) ⊆ 𝐶 → (𝑓 “ ({𝑥} × 𝐴)) ≼ 𝐶))
9146, 89, 90sylc 65 . . . . . . . . . 10 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) → (𝑓 “ ({𝑥} × 𝐴)) ≼ 𝐶)
92 f1ocnv 6620 . . . . . . . . . . . . . . 15 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → 𝑓:(𝐴 × 𝐴)–1-1-onto→(𝐵𝐶))
93 f1of1 6607 . . . . . . . . . . . . . . 15 (𝑓:(𝐴 × 𝐴)–1-1-onto→(𝐵𝐶) → 𝑓:(𝐴 × 𝐴)–1-1→(𝐵𝐶))
9492, 93syl 17 . . . . . . . . . . . . . 14 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → 𝑓:(𝐴 × 𝐴)–1-1→(𝐵𝐶))
9594adantr 483 . . . . . . . . . . . . 13 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) → 𝑓:(𝐴 × 𝐴)–1-1→(𝐵𝐶))
9631adantr 483 . . . . . . . . . . . . 13 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) → (𝐵𝐶) ∈ V)
97 snex 5322 . . . . . . . . . . . . . 14 {𝑥} ∈ V
9812adantr 483 . . . . . . . . . . . . . 14 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) → 𝐴 ∈ V)
99 xpexg 7465 . . . . . . . . . . . . . 14 (({𝑥} ∈ V ∧ 𝐴 ∈ V) → ({𝑥} × 𝐴) ∈ V)
10097, 98, 99sylancr 589 . . . . . . . . . . . . 13 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) → ({𝑥} × 𝐴) ∈ V)
101 f1imaen2g 8562 . . . . . . . . . . . . 13 (((𝑓:(𝐴 × 𝐴)–1-1→(𝐵𝐶) ∧ (𝐵𝐶) ∈ V) ∧ (({𝑥} × 𝐴) ⊆ (𝐴 × 𝐴) ∧ ({𝑥} × 𝐴) ∈ V)) → (𝑓 “ ({𝑥} × 𝐴)) ≈ ({𝑥} × 𝐴))
10295, 96, 65, 100, 101syl22anc 836 . . . . . . . . . . . 12 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) → (𝑓 “ ({𝑥} × 𝐴)) ≈ ({𝑥} × 𝐴))
103 vex 3496 . . . . . . . . . . . . 13 𝑥 ∈ V
104 xpsnen2g 8602 . . . . . . . . . . . . 13 ((𝑥 ∈ V ∧ 𝐴 ∈ V) → ({𝑥} × 𝐴) ≈ 𝐴)
105103, 98, 104sylancr 589 . . . . . . . . . . . 12 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) → ({𝑥} × 𝐴) ≈ 𝐴)
106 entr 8553 . . . . . . . . . . . 12 (((𝑓 “ ({𝑥} × 𝐴)) ≈ ({𝑥} × 𝐴) ∧ ({𝑥} × 𝐴) ≈ 𝐴) → (𝑓 “ ({𝑥} × 𝐴)) ≈ 𝐴)
107102, 105, 106syl2anc 586 . . . . . . . . . . 11 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) → (𝑓 “ ({𝑥} × 𝐴)) ≈ 𝐴)
108 domen1 8651 . . . . . . . . . . 11 ((𝑓 “ ({𝑥} × 𝐴)) ≈ 𝐴 → ((𝑓 “ ({𝑥} × 𝐴)) ≼ 𝐶𝐴𝐶))
109107, 108syl 17 . . . . . . . . . 10 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) → ((𝑓 “ ({𝑥} × 𝐴)) ≼ 𝐶𝐴𝐶))
11091, 109mpbid 234 . . . . . . . . 9 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) → 𝐴𝐶)
111110olcd 872 . . . . . . . 8 ((𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) ∧ 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵))) → (𝐴* 𝐵𝐴𝐶))
112111ex 415 . . . . . . 7 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → (𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵)) → (𝐴* 𝐵𝐴𝐶)))
113112exlimdv 1927 . . . . . 6 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → (∃𝑥 𝑥 ∈ (𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵)) → (𝐴* 𝐵𝐴𝐶)))
11442, 113syl5bi 244 . . . . 5 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → ((𝐴 ∖ (((1st ↾ (𝐴 × 𝐴)) ∘ 𝑓) “ 𝐵)) ≠ ∅ → (𝐴* 𝐵𝐴𝐶)))
11541, 114pm2.61dne 3101 . . . 4 (𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → (𝐴* 𝐵𝐴𝐶))
116115exlimiv 1924 . . 3 (∃𝑓 𝑓:(𝐵𝐶)–1-1-onto→(𝐴 × 𝐴) → (𝐴* 𝐵𝐴𝐶))
1172, 116sylbi 219 . 2 ((𝐵𝐶) ≈ (𝐴 × 𝐴) → (𝐴* 𝐵𝐴𝐶))
1181, 117syl 17 1 ((𝐴 × 𝐴) ≈ (𝐵𝐶) → (𝐴* 𝐵𝐴𝐶))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 208   ∧ wa 398   ∨ wo 843   = wceq 1530  ∃wex 1773   ∈ wcel 2107   ≠ wne 3014  Vcvv 3493   ∖ cdif 3931   ∪ cun 3932   ⊆ wss 3934  ∅c0 4289  {csn 4559   class class class wbr 5057   × cxp 5546  ◡ccnv 5547  dom cdm 5548  ran crn 5549   ↾ cres 5550   “ cima 5551   ∘ ccom 5552  Fun wfun 6342   Fn wfn 6343  ⟶wf 6344  –1-1→wf1 6345  –onto→wfo 6346  –1-1-onto→wf1o 6347  ‘cfv 6348  1st c1st 7679   ≈ cen 8498   ≼ cdom 8499   ≼* cwdom 9013 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 1904  ax-6 1963  ax-7 2008  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2153  ax-12 2169  ax-ext 2791  ax-sep 5194  ax-nul 5201  ax-pow 5257  ax-pr 5320  ax-un 7453 This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1083  df-tru 1533  df-ex 1774  df-nf 1778  df-sb 2063  df-mo 2616  df-eu 2648  df-clab 2798  df-cleq 2812  df-clel 2891  df-nfc 2961  df-ne 3015  df-ral 3141  df-rex 3142  df-rab 3145  df-v 3495  df-sbc 3771  df-csb 3882  df-dif 3937  df-un 3939  df-in 3941  df-ss 3950  df-nul 4290  df-if 4466  df-pw 4539  df-sn 4560  df-pr 4562  df-op 4566  df-uni 4831  df-int 4868  df-iun 4912  df-br 5058  df-opab 5120  df-mpt 5138  df-id 5453  df-xp 5554  df-rel 5555  df-cnv 5556  df-co 5557  df-dm 5558  df-rn 5559  df-res 5560  df-ima 5561  df-iota 6307  df-fun 6350  df-fn 6351  df-f 6352  df-f1 6353  df-fo 6354  df-f1o 6355  df-fv 6356  df-1st 7681  df-2nd 7682  df-er 8281  df-en 8502  df-dom 8503  df-sdom 8504  df-wdom 9015 This theorem is referenced by:  unxpwdom  9045  ttac  39623
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