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Theorem f1prex 7136
Description: Relate a one-to-one function with a pair as domain and two different variables. (Contributed by Thierry Arnoux, 12-Jul-2020.)
Hypotheses
Ref Expression
f1prex.1 (𝑥 = (𝑓𝐴) → (𝜓𝜒))
f1prex.2 (𝑦 = (𝑓𝐵) → (𝜒𝜑))
Assertion
Ref Expression
f1prex ((𝐴𝑉𝐵𝑊𝐴𝐵) → (∃𝑓(𝑓:{𝐴, 𝐵}–1-1𝐷𝜑) ↔ ∃𝑥𝐷𝑦𝐷 (𝑥𝑦𝜓)))
Distinct variable groups:   𝐴,𝑓,𝑥,𝑦   𝐵,𝑓,𝑥,𝑦   𝐷,𝑓,𝑥,𝑦   𝑓,𝑉,𝑥,𝑦   𝑓,𝑊,𝑥,𝑦   𝜒,𝑥   𝜓,𝑓   𝜑,𝑥,𝑦
Allowed substitution hints:   𝜑(𝑓)   𝜓(𝑥,𝑦)   𝜒(𝑦,𝑓)

Proof of Theorem f1prex
StepHypRef Expression
1 simpl1 1189 . . . . . 6 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → 𝐴𝑉)
2 simpl2 1190 . . . . . 6 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → 𝐵𝑊)
3 simprl 767 . . . . . . 7 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → 𝑓:{𝐴, 𝐵}–1-1𝐷)
4 f1f 6654 . . . . . . 7 (𝑓:{𝐴, 𝐵}–1-1𝐷𝑓:{𝐴, 𝐵}⟶𝐷)
53, 4syl 17 . . . . . 6 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → 𝑓:{𝐴, 𝐵}⟶𝐷)
6 fpr2g 7069 . . . . . . . 8 ((𝐴𝑉𝐵𝑊) → (𝑓:{𝐴, 𝐵}⟶𝐷 ↔ ((𝑓𝐴) ∈ 𝐷 ∧ (𝑓𝐵) ∈ 𝐷𝑓 = {⟨𝐴, (𝑓𝐴)⟩, ⟨𝐵, (𝑓𝐵)⟩})))
76biimpa 476 . . . . . . 7 (((𝐴𝑉𝐵𝑊) ∧ 𝑓:{𝐴, 𝐵}⟶𝐷) → ((𝑓𝐴) ∈ 𝐷 ∧ (𝑓𝐵) ∈ 𝐷𝑓 = {⟨𝐴, (𝑓𝐴)⟩, ⟨𝐵, (𝑓𝐵)⟩}))
87simp1d 1140 . . . . . 6 (((𝐴𝑉𝐵𝑊) ∧ 𝑓:{𝐴, 𝐵}⟶𝐷) → (𝑓𝐴) ∈ 𝐷)
91, 2, 5, 8syl21anc 834 . . . . 5 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → (𝑓𝐴) ∈ 𝐷)
107simp2d 1141 . . . . . 6 (((𝐴𝑉𝐵𝑊) ∧ 𝑓:{𝐴, 𝐵}⟶𝐷) → (𝑓𝐵) ∈ 𝐷)
111, 2, 5, 10syl21anc 834 . . . . 5 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → (𝑓𝐵) ∈ 𝐷)
12 prid1g 4693 . . . . . . . . 9 (𝐴𝑉𝐴 ∈ {𝐴, 𝐵})
131, 12syl 17 . . . . . . . 8 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → 𝐴 ∈ {𝐴, 𝐵})
14 prid2g 4694 . . . . . . . . 9 (𝐵𝑊𝐵 ∈ {𝐴, 𝐵})
152, 14syl 17 . . . . . . . 8 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → 𝐵 ∈ {𝐴, 𝐵})
1613, 15jca 511 . . . . . . 7 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → (𝐴 ∈ {𝐴, 𝐵} ∧ 𝐵 ∈ {𝐴, 𝐵}))
17 simpl3 1191 . . . . . . 7 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → 𝐴𝐵)
18 f1veqaeq 7111 . . . . . . . . 9 ((𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝐴 ∈ {𝐴, 𝐵} ∧ 𝐵 ∈ {𝐴, 𝐵})) → ((𝑓𝐴) = (𝑓𝐵) → 𝐴 = 𝐵))
1918necon3d 2963 . . . . . . . 8 ((𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝐴 ∈ {𝐴, 𝐵} ∧ 𝐵 ∈ {𝐴, 𝐵})) → (𝐴𝐵 → (𝑓𝐴) ≠ (𝑓𝐵)))
2019imp 406 . . . . . . 7 (((𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝐴 ∈ {𝐴, 𝐵} ∧ 𝐵 ∈ {𝐴, 𝐵})) ∧ 𝐴𝐵) → (𝑓𝐴) ≠ (𝑓𝐵))
213, 16, 17, 20syl21anc 834 . . . . . 6 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → (𝑓𝐴) ≠ (𝑓𝐵))
22 simprr 769 . . . . . 6 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → 𝜑)
2321, 22jca 511 . . . . 5 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → ((𝑓𝐴) ≠ (𝑓𝐵) ∧ 𝜑))
24 neeq1 3005 . . . . . . 7 (𝑥 = (𝑓𝐴) → (𝑥𝑦 ↔ (𝑓𝐴) ≠ 𝑦))
25 f1prex.1 . . . . . . 7 (𝑥 = (𝑓𝐴) → (𝜓𝜒))
2624, 25anbi12d 630 . . . . . 6 (𝑥 = (𝑓𝐴) → ((𝑥𝑦𝜓) ↔ ((𝑓𝐴) ≠ 𝑦𝜒)))
27 neeq2 3006 . . . . . . 7 (𝑦 = (𝑓𝐵) → ((𝑓𝐴) ≠ 𝑦 ↔ (𝑓𝐴) ≠ (𝑓𝐵)))
28 f1prex.2 . . . . . . 7 (𝑦 = (𝑓𝐵) → (𝜒𝜑))
2927, 28anbi12d 630 . . . . . 6 (𝑦 = (𝑓𝐵) → (((𝑓𝐴) ≠ 𝑦𝜒) ↔ ((𝑓𝐴) ≠ (𝑓𝐵) ∧ 𝜑)))
3026, 29rspc2ev 3564 . . . . 5 (((𝑓𝐴) ∈ 𝐷 ∧ (𝑓𝐵) ∈ 𝐷 ∧ ((𝑓𝐴) ≠ (𝑓𝐵) ∧ 𝜑)) → ∃𝑥𝐷𝑦𝐷 (𝑥𝑦𝜓))
319, 11, 23, 30syl3anc 1369 . . . 4 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → ∃𝑥𝐷𝑦𝐷 (𝑥𝑦𝜓))
3231ex 412 . . 3 ((𝐴𝑉𝐵𝑊𝐴𝐵) → ((𝑓:{𝐴, 𝐵}–1-1𝐷𝜑) → ∃𝑥𝐷𝑦𝐷 (𝑥𝑦𝜓)))
3332exlimdv 1937 . 2 ((𝐴𝑉𝐵𝑊𝐴𝐵) → (∃𝑓(𝑓:{𝐴, 𝐵}–1-1𝐷𝜑) → ∃𝑥𝐷𝑦𝐷 (𝑥𝑦𝜓)))
34 simpll1 1210 . . . . . . . . . 10 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → 𝐴𝑉)
35 simplrl 773 . . . . . . . . . 10 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → 𝑥𝐷)
3634, 35jca 511 . . . . . . . . 9 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → (𝐴𝑉𝑥𝐷))
37 simpll2 1211 . . . . . . . . . 10 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → 𝐵𝑊)
38 simplrr 774 . . . . . . . . . 10 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → 𝑦𝐷)
3937, 38jca 511 . . . . . . . . 9 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → (𝐵𝑊𝑦𝐷))
40 simpll3 1212 . . . . . . . . 9 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → 𝐴𝐵)
41 simprl 767 . . . . . . . . 9 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → 𝑥𝑦)
42 f1oprg 6744 . . . . . . . . . 10 (((𝐴𝑉𝑥𝐷) ∧ (𝐵𝑊𝑦𝐷)) → ((𝐴𝐵𝑥𝑦) → {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}:{𝐴, 𝐵}–1-1-onto→{𝑥, 𝑦}))
4342imp 406 . . . . . . . . 9 ((((𝐴𝑉𝑥𝐷) ∧ (𝐵𝑊𝑦𝐷)) ∧ (𝐴𝐵𝑥𝑦)) → {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}:{𝐴, 𝐵}–1-1-onto→{𝑥, 𝑦})
4436, 39, 40, 41, 43syl22anc 835 . . . . . . . 8 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}:{𝐴, 𝐵}–1-1-onto→{𝑥, 𝑦})
45 f1of1 6699 . . . . . . . 8 ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}:{𝐴, 𝐵}–1-1-onto→{𝑥, 𝑦} → {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}:{𝐴, 𝐵}–1-1→{𝑥, 𝑦})
4644, 45syl 17 . . . . . . 7 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}:{𝐴, 𝐵}–1-1→{𝑥, 𝑦})
4735, 38prssd 4752 . . . . . . 7 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → {𝑥, 𝑦} ⊆ 𝐷)
48 f1ss 6660 . . . . . . 7 (({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}:{𝐴, 𝐵}–1-1→{𝑥, 𝑦} ∧ {𝑥, 𝑦} ⊆ 𝐷) → {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}:{𝐴, 𝐵}–1-1𝐷)
4946, 47, 48syl2anc 583 . . . . . 6 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}:{𝐴, 𝐵}–1-1𝐷)
50 fvpr1g 7044 . . . . . . . 8 ((𝐴𝑉𝑥𝐷𝐴𝐵) → ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐴) = 𝑥)
5150eqcomd 2744 . . . . . . 7 ((𝐴𝑉𝑥𝐷𝐴𝐵) → 𝑥 = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐴))
5234, 35, 40, 51syl3anc 1369 . . . . . 6 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → 𝑥 = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐴))
53 fvpr2g 7045 . . . . . . . 8 ((𝐵𝑊𝑦𝐷𝐴𝐵) → ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐵) = 𝑦)
5453eqcomd 2744 . . . . . . 7 ((𝐵𝑊𝑦𝐷𝐴𝐵) → 𝑦 = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐵))
5537, 38, 40, 54syl3anc 1369 . . . . . 6 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → 𝑦 = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐵))
56 prex 5350 . . . . . . 7 {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩} ∈ V
57 f1eq1 6649 . . . . . . . 8 (𝑓 = {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩} → (𝑓:{𝐴, 𝐵}–1-1𝐷 ↔ {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}:{𝐴, 𝐵}–1-1𝐷))
58 fveq1 6755 . . . . . . . . . 10 (𝑓 = {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩} → (𝑓𝐴) = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐴))
5958eqeq2d 2749 . . . . . . . . 9 (𝑓 = {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩} → (𝑥 = (𝑓𝐴) ↔ 𝑥 = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐴)))
60 fveq1 6755 . . . . . . . . . 10 (𝑓 = {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩} → (𝑓𝐵) = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐵))
6160eqeq2d 2749 . . . . . . . . 9 (𝑓 = {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩} → (𝑦 = (𝑓𝐵) ↔ 𝑦 = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐵)))
6259, 61anbi12d 630 . . . . . . . 8 (𝑓 = {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩} → ((𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵)) ↔ (𝑥 = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐴) ∧ 𝑦 = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐵))))
6357, 62anbi12d 630 . . . . . . 7 (𝑓 = {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩} → ((𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵))) ↔ ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐴) ∧ 𝑦 = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐵)))))
6456, 63spcev 3535 . . . . . 6 (({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐴) ∧ 𝑦 = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐵))) → ∃𝑓(𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵))))
6549, 52, 55, 64syl12anc 833 . . . . 5 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → ∃𝑓(𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵))))
66 simprl 767 . . . . . . . 8 (((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵)))) → 𝑓:{𝐴, 𝐵}–1-1𝐷)
67 simplrr 774 . . . . . . . . . 10 (((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵)))) → 𝜓)
68 simprrl 777 . . . . . . . . . . 11 (((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵)))) → 𝑥 = (𝑓𝐴))
6968, 25syl 17 . . . . . . . . . 10 (((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵)))) → (𝜓𝜒))
7067, 69mpbid 231 . . . . . . . . 9 (((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵)))) → 𝜒)
71 simprrr 778 . . . . . . . . . 10 (((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵)))) → 𝑦 = (𝑓𝐵))
7271, 28syl 17 . . . . . . . . 9 (((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵)))) → (𝜒𝜑))
7370, 72mpbid 231 . . . . . . . 8 (((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵)))) → 𝜑)
7466, 73jca 511 . . . . . . 7 (((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵)))) → (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑))
7574ex 412 . . . . . 6 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → ((𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵))) → (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)))
7675eximdv 1921 . . . . 5 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → (∃𝑓(𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵))) → ∃𝑓(𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)))
7765, 76mpd 15 . . . 4 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → ∃𝑓(𝑓:{𝐴, 𝐵}–1-1𝐷𝜑))
7877ex 412 . . 3 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) → ((𝑥𝑦𝜓) → ∃𝑓(𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)))
7978rexlimdvva 3222 . 2 ((𝐴𝑉𝐵𝑊𝐴𝐵) → (∃𝑥𝐷𝑦𝐷 (𝑥𝑦𝜓) → ∃𝑓(𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)))
8033, 79impbid 211 1 ((𝐴𝑉𝐵𝑊𝐴𝐵) → (∃𝑓(𝑓:{𝐴, 𝐵}–1-1𝐷𝜑) ↔ ∃𝑥𝐷𝑦𝐷 (𝑥𝑦𝜓)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wa 395  w3a 1085   = wceq 1539  wex 1783  wcel 2108  wne 2942  wrex 3064  wss 3883  {cpr 4560  cop 4564  wf 6414  1-1wf1 6415  1-1-ontowf1o 6417  cfv 6418
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-pr 5347
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  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-nul 4254  df-if 4457  df-sn 4559  df-pr 4561  df-op 4565  df-uni 4837  df-br 5071  df-opab 5133  df-mpt 5154  df-id 5480  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-iota 6376  df-fun 6420  df-fn 6421  df-f 6422  df-f1 6423  df-fo 6424  df-f1o 6425  df-fv 6426
This theorem is referenced by:  istrkg3ld  26726
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