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Theorem f1prex 6579
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 1084 . . . . . . 7 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → 𝐴𝑉)
2 simpl2 1085 . . . . . . 7 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → 𝐵𝑊)
3 simprl 809 . . . . . . . 8 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → 𝑓:{𝐴, 𝐵}–1-1𝐷)
4 f1f 6139 . . . . . . . 8 (𝑓:{𝐴, 𝐵}–1-1𝐷𝑓:{𝐴, 𝐵}⟶𝐷)
53, 4syl 17 . . . . . . 7 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → 𝑓:{𝐴, 𝐵}⟶𝐷)
6 fpr2g 6516 . . . . . . . . 9 ((𝐴𝑉𝐵𝑊) → (𝑓:{𝐴, 𝐵}⟶𝐷 ↔ ((𝑓𝐴) ∈ 𝐷 ∧ (𝑓𝐵) ∈ 𝐷𝑓 = {⟨𝐴, (𝑓𝐴)⟩, ⟨𝐵, (𝑓𝐵)⟩})))
76biimpa 500 . . . . . . . 8 (((𝐴𝑉𝐵𝑊) ∧ 𝑓:{𝐴, 𝐵}⟶𝐷) → ((𝑓𝐴) ∈ 𝐷 ∧ (𝑓𝐵) ∈ 𝐷𝑓 = {⟨𝐴, (𝑓𝐴)⟩, ⟨𝐵, (𝑓𝐵)⟩}))
87simp1d 1093 . . . . . . 7 (((𝐴𝑉𝐵𝑊) ∧ 𝑓:{𝐴, 𝐵}⟶𝐷) → (𝑓𝐴) ∈ 𝐷)
91, 2, 5, 8syl21anc 1365 . . . . . 6 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → (𝑓𝐴) ∈ 𝐷)
107simp2d 1094 . . . . . . 7 (((𝐴𝑉𝐵𝑊) ∧ 𝑓:{𝐴, 𝐵}⟶𝐷) → (𝑓𝐵) ∈ 𝐷)
111, 2, 5, 10syl21anc 1365 . . . . . 6 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → (𝑓𝐵) ∈ 𝐷)
12 prid1g 4327 . . . . . . . . . 10 (𝐴𝑉𝐴 ∈ {𝐴, 𝐵})
131, 12syl 17 . . . . . . . . 9 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → 𝐴 ∈ {𝐴, 𝐵})
14 prid2g 4328 . . . . . . . . . 10 (𝐵𝑊𝐵 ∈ {𝐴, 𝐵})
152, 14syl 17 . . . . . . . . 9 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → 𝐵 ∈ {𝐴, 𝐵})
1613, 15jca 553 . . . . . . . 8 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → (𝐴 ∈ {𝐴, 𝐵} ∧ 𝐵 ∈ {𝐴, 𝐵}))
17 simpl3 1086 . . . . . . . 8 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → 𝐴𝐵)
18 f1veqaeq 6554 . . . . . . . . . 10 ((𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝐴 ∈ {𝐴, 𝐵} ∧ 𝐵 ∈ {𝐴, 𝐵})) → ((𝑓𝐴) = (𝑓𝐵) → 𝐴 = 𝐵))
1918necon3d 2844 . . . . . . . . 9 ((𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝐴 ∈ {𝐴, 𝐵} ∧ 𝐵 ∈ {𝐴, 𝐵})) → (𝐴𝐵 → (𝑓𝐴) ≠ (𝑓𝐵)))
2019imp 444 . . . . . . . 8 (((𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝐴 ∈ {𝐴, 𝐵} ∧ 𝐵 ∈ {𝐴, 𝐵})) ∧ 𝐴𝐵) → (𝑓𝐴) ≠ (𝑓𝐵))
213, 16, 17, 20syl21anc 1365 . . . . . . 7 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → (𝑓𝐴) ≠ (𝑓𝐵))
22 simprr 811 . . . . . . 7 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → 𝜑)
2321, 22jca 553 . . . . . 6 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → ((𝑓𝐴) ≠ (𝑓𝐵) ∧ 𝜑))
24 neeq1 2885 . . . . . . . 8 (𝑥 = (𝑓𝐴) → (𝑥𝑦 ↔ (𝑓𝐴) ≠ 𝑦))
25 f1prex.1 . . . . . . . 8 (𝑥 = (𝑓𝐴) → (𝜓𝜒))
2624, 25anbi12d 747 . . . . . . 7 (𝑥 = (𝑓𝐴) → ((𝑥𝑦𝜓) ↔ ((𝑓𝐴) ≠ 𝑦𝜒)))
27 neeq2 2886 . . . . . . . 8 (𝑦 = (𝑓𝐵) → ((𝑓𝐴) ≠ 𝑦 ↔ (𝑓𝐴) ≠ (𝑓𝐵)))
28 f1prex.2 . . . . . . . 8 (𝑦 = (𝑓𝐵) → (𝜒𝜑))
2927, 28anbi12d 747 . . . . . . 7 (𝑦 = (𝑓𝐵) → (((𝑓𝐴) ≠ 𝑦𝜒) ↔ ((𝑓𝐴) ≠ (𝑓𝐵) ∧ 𝜑)))
3026, 29rspc2ev 3355 . . . . . 6 (((𝑓𝐴) ∈ 𝐷 ∧ (𝑓𝐵) ∈ 𝐷 ∧ ((𝑓𝐴) ≠ (𝑓𝐵) ∧ 𝜑)) → ∃𝑥𝐷𝑦𝐷 (𝑥𝑦𝜓))
319, 11, 23, 30syl3anc 1366 . . . . 5 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → ∃𝑥𝐷𝑦𝐷 (𝑥𝑦𝜓))
3231ex 449 . . . 4 ((𝐴𝑉𝐵𝑊𝐴𝐵) → ((𝑓:{𝐴, 𝐵}–1-1𝐷𝜑) → ∃𝑥𝐷𝑦𝐷 (𝑥𝑦𝜓)))
3332exlimdv 1901 . . 3 ((𝐴𝑉𝐵𝑊𝐴𝐵) → (∃𝑓(𝑓:{𝐴, 𝐵}–1-1𝐷𝜑) → ∃𝑥𝐷𝑦𝐷 (𝑥𝑦𝜓)))
3433imp 444 . 2 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ ∃𝑓(𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)) → ∃𝑥𝐷𝑦𝐷 (𝑥𝑦𝜓))
35 simpll1 1120 . . . . . . . . . . 11 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → 𝐴𝑉)
36 simplrl 817 . . . . . . . . . . 11 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → 𝑥𝐷)
3735, 36jca 553 . . . . . . . . . 10 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → (𝐴𝑉𝑥𝐷))
38 simpll2 1121 . . . . . . . . . . 11 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → 𝐵𝑊)
39 simplrr 818 . . . . . . . . . . 11 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → 𝑦𝐷)
4038, 39jca 553 . . . . . . . . . 10 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → (𝐵𝑊𝑦𝐷))
41 simpll3 1122 . . . . . . . . . 10 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → 𝐴𝐵)
42 simprl 809 . . . . . . . . . 10 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → 𝑥𝑦)
43 f1oprg 6219 . . . . . . . . . . 11 (((𝐴𝑉𝑥𝐷) ∧ (𝐵𝑊𝑦𝐷)) → ((𝐴𝐵𝑥𝑦) → {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}:{𝐴, 𝐵}–1-1-onto→{𝑥, 𝑦}))
4443imp 444 . . . . . . . . . 10 ((((𝐴𝑉𝑥𝐷) ∧ (𝐵𝑊𝑦𝐷)) ∧ (𝐴𝐵𝑥𝑦)) → {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}:{𝐴, 𝐵}–1-1-onto→{𝑥, 𝑦})
4537, 40, 41, 42, 44syl22anc 1367 . . . . . . . . 9 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}:{𝐴, 𝐵}–1-1-onto→{𝑥, 𝑦})
46 f1of1 6174 . . . . . . . . 9 ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}:{𝐴, 𝐵}–1-1-onto→{𝑥, 𝑦} → {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}:{𝐴, 𝐵}–1-1→{𝑥, 𝑦})
4745, 46syl 17 . . . . . . . 8 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}:{𝐴, 𝐵}–1-1→{𝑥, 𝑦})
48 prssi 4385 . . . . . . . . 9 ((𝑥𝐷𝑦𝐷) → {𝑥, 𝑦} ⊆ 𝐷)
4936, 39, 48syl2anc 694 . . . . . . . 8 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → {𝑥, 𝑦} ⊆ 𝐷)
50 f1ss 6144 . . . . . . . 8 (({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}:{𝐴, 𝐵}–1-1→{𝑥, 𝑦} ∧ {𝑥, 𝑦} ⊆ 𝐷) → {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}:{𝐴, 𝐵}–1-1𝐷)
5147, 49, 50syl2anc 694 . . . . . . 7 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}:{𝐴, 𝐵}–1-1𝐷)
52 fvpr1g 6499 . . . . . . . . 9 ((𝐴𝑉𝑥𝐷𝐴𝐵) → ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐴) = 𝑥)
5352eqcomd 2657 . . . . . . . 8 ((𝐴𝑉𝑥𝐷𝐴𝐵) → 𝑥 = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐴))
5435, 36, 41, 53syl3anc 1366 . . . . . . 7 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → 𝑥 = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐴))
55 fvpr2g 6500 . . . . . . . . 9 ((𝐵𝑊𝑦𝐷𝐴𝐵) → ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐵) = 𝑦)
5655eqcomd 2657 . . . . . . . 8 ((𝐵𝑊𝑦𝐷𝐴𝐵) → 𝑦 = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐵))
5738, 39, 41, 56syl3anc 1366 . . . . . . 7 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → 𝑦 = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐵))
58 prex 4939 . . . . . . . 8 {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩} ∈ V
59 f1eq1 6134 . . . . . . . . 9 (𝑓 = {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩} → (𝑓:{𝐴, 𝐵}–1-1𝐷 ↔ {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}:{𝐴, 𝐵}–1-1𝐷))
60 fveq1 6228 . . . . . . . . . . 11 (𝑓 = {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩} → (𝑓𝐴) = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐴))
6160eqeq2d 2661 . . . . . . . . . 10 (𝑓 = {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩} → (𝑥 = (𝑓𝐴) ↔ 𝑥 = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐴)))
62 fveq1 6228 . . . . . . . . . . 11 (𝑓 = {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩} → (𝑓𝐵) = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐵))
6362eqeq2d 2661 . . . . . . . . . 10 (𝑓 = {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩} → (𝑦 = (𝑓𝐵) ↔ 𝑦 = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐵)))
6461, 63anbi12d 747 . . . . . . . . 9 (𝑓 = {⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩} → ((𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵)) ↔ (𝑥 = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐴) ∧ 𝑦 = ({⟨𝐴, 𝑥⟩, ⟨𝐵, 𝑦⟩}‘𝐵))))
6559, 64anbi12d 747 . . . . . . . 8 (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)))))
6658, 65spcev 3331 . . . . . . 7 (({⟨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))))
6751, 54, 57, 66syl12anc 1364 . . . . . 6 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → ∃𝑓(𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵))))
68 simprl 809 . . . . . . . . 9 (((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵)))) → 𝑓:{𝐴, 𝐵}–1-1𝐷)
69 simplrr 818 . . . . . . . . . . 11 (((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵)))) → 𝜓)
70 simprrl 821 . . . . . . . . . . . 12 (((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵)))) → 𝑥 = (𝑓𝐴))
7170, 25syl 17 . . . . . . . . . . 11 (((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵)))) → (𝜓𝜒))
7269, 71mpbid 222 . . . . . . . . . 10 (((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵)))) → 𝜒)
73 simprrr 822 . . . . . . . . . . 11 (((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵)))) → 𝑦 = (𝑓𝐵))
7473, 28syl 17 . . . . . . . . . 10 (((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵)))) → (𝜒𝜑))
7572, 74mpbid 222 . . . . . . . . 9 (((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵)))) → 𝜑)
7668, 75jca 553 . . . . . . . 8 (((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) ∧ (𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵)))) → (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑))
7776ex 449 . . . . . . 7 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → ((𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵))) → (𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)))
7877eximdv 1886 . . . . . 6 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → (∃𝑓(𝑓:{𝐴, 𝐵}–1-1𝐷 ∧ (𝑥 = (𝑓𝐴) ∧ 𝑦 = (𝑓𝐵))) → ∃𝑓(𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)))
7967, 78mpd 15 . . . . 5 ((((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) ∧ (𝑥𝑦𝜓)) → ∃𝑓(𝑓:{𝐴, 𝐵}–1-1𝐷𝜑))
8079ex 449 . . . 4 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ (𝑥𝐷𝑦𝐷)) → ((𝑥𝑦𝜓) → ∃𝑓(𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)))
8180rexlimdvva 3067 . . 3 ((𝐴𝑉𝐵𝑊𝐴𝐵) → (∃𝑥𝐷𝑦𝐷 (𝑥𝑦𝜓) → ∃𝑓(𝑓:{𝐴, 𝐵}–1-1𝐷𝜑)))
8281imp 444 . 2 (((𝐴𝑉𝐵𝑊𝐴𝐵) ∧ ∃𝑥𝐷𝑦𝐷 (𝑥𝑦𝜓)) → ∃𝑓(𝑓:{𝐴, 𝐵}–1-1𝐷𝜑))
8334, 82impbida 895 1 ((𝐴𝑉𝐵𝑊𝐴𝐵) → (∃𝑓(𝑓:{𝐴, 𝐵}–1-1𝐷𝜑) ↔ ∃𝑥𝐷𝑦𝐷 (𝑥𝑦𝜓)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 383  w3a 1054   = wceq 1523  wex 1744  wcel 2030  wne 2823  wrex 2942  wss 3607  {cpr 4212  cop 4216  wf 5922  1-1wf1 5923  1-1-ontowf1o 5925  cfv 5926
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-ral 2946  df-rex 2947  df-reu 2948  df-rab 2950  df-v 3233  df-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-nul 3949  df-if 4120  df-sn 4211  df-pr 4213  df-op 4217  df-uni 4469  df-br 4686  df-opab 4746  df-mpt 4763  df-id 5053  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-f1 5931  df-fo 5932  df-f1o 5933  df-fv 5934
This theorem is referenced by:  istrkg3ld  25405
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