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Theorem xpf1o 6744
 Description: Construct a bijection on a Cartesian product given bijections on the factors. (Contributed by Mario Carneiro, 30-May-2015.)
Hypotheses
Ref Expression
xpf1o.1 (𝜑 → (𝑥𝐴𝑋):𝐴1-1-onto𝐵)
xpf1o.2 (𝜑 → (𝑦𝐶𝑌):𝐶1-1-onto𝐷)
Assertion
Ref Expression
xpf1o (𝜑 → (𝑥𝐴, 𝑦𝐶 ↦ ⟨𝑋, 𝑌⟩):(𝐴 × 𝐶)–1-1-onto→(𝐵 × 𝐷))
Distinct variable groups:   𝑥,𝑦,𝐴   𝑥,𝐶,𝑦   𝑦,𝑋   𝑥,𝐵   𝑦,𝐷   𝑥,𝑌
Allowed substitution hints:   𝜑(𝑥,𝑦)   𝐵(𝑦)   𝐷(𝑥)   𝑋(𝑥)   𝑌(𝑦)

Proof of Theorem xpf1o
Dummy variables 𝑡 𝑠 𝑢 𝑣 𝑤 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 xp1st 6069 . . . . . 6 (𝑢 ∈ (𝐴 × 𝐶) → (1st𝑢) ∈ 𝐴)
21adantl 275 . . . . 5 ((𝜑𝑢 ∈ (𝐴 × 𝐶)) → (1st𝑢) ∈ 𝐴)
3 xpf1o.1 . . . . . . . 8 (𝜑 → (𝑥𝐴𝑋):𝐴1-1-onto𝐵)
4 eqid 2140 . . . . . . . . 9 (𝑥𝐴𝑋) = (𝑥𝐴𝑋)
54f1ompt 5577 . . . . . . . 8 ((𝑥𝐴𝑋):𝐴1-1-onto𝐵 ↔ (∀𝑥𝐴 𝑋𝐵 ∧ ∀𝑧𝐵 ∃!𝑥𝐴 𝑧 = 𝑋))
63, 5sylib 121 . . . . . . 7 (𝜑 → (∀𝑥𝐴 𝑋𝐵 ∧ ∀𝑧𝐵 ∃!𝑥𝐴 𝑧 = 𝑋))
76simpld 111 . . . . . 6 (𝜑 → ∀𝑥𝐴 𝑋𝐵)
87adantr 274 . . . . 5 ((𝜑𝑢 ∈ (𝐴 × 𝐶)) → ∀𝑥𝐴 𝑋𝐵)
9 nfcsb1v 3038 . . . . . . 7 𝑥(1st𝑢) / 𝑥𝑋
109nfel1 2293 . . . . . 6 𝑥(1st𝑢) / 𝑥𝑋𝐵
11 csbeq1a 3015 . . . . . . 7 (𝑥 = (1st𝑢) → 𝑋 = (1st𝑢) / 𝑥𝑋)
1211eleq1d 2209 . . . . . 6 (𝑥 = (1st𝑢) → (𝑋𝐵(1st𝑢) / 𝑥𝑋𝐵))
1310, 12rspc 2786 . . . . 5 ((1st𝑢) ∈ 𝐴 → (∀𝑥𝐴 𝑋𝐵(1st𝑢) / 𝑥𝑋𝐵))
142, 8, 13sylc 62 . . . 4 ((𝜑𝑢 ∈ (𝐴 × 𝐶)) → (1st𝑢) / 𝑥𝑋𝐵)
15 xp2nd 6070 . . . . . 6 (𝑢 ∈ (𝐴 × 𝐶) → (2nd𝑢) ∈ 𝐶)
1615adantl 275 . . . . 5 ((𝜑𝑢 ∈ (𝐴 × 𝐶)) → (2nd𝑢) ∈ 𝐶)
17 xpf1o.2 . . . . . . . 8 (𝜑 → (𝑦𝐶𝑌):𝐶1-1-onto𝐷)
18 eqid 2140 . . . . . . . . 9 (𝑦𝐶𝑌) = (𝑦𝐶𝑌)
1918f1ompt 5577 . . . . . . . 8 ((𝑦𝐶𝑌):𝐶1-1-onto𝐷 ↔ (∀𝑦𝐶 𝑌𝐷 ∧ ∀𝑤𝐷 ∃!𝑦𝐶 𝑤 = 𝑌))
2017, 19sylib 121 . . . . . . 7 (𝜑 → (∀𝑦𝐶 𝑌𝐷 ∧ ∀𝑤𝐷 ∃!𝑦𝐶 𝑤 = 𝑌))
2120simpld 111 . . . . . 6 (𝜑 → ∀𝑦𝐶 𝑌𝐷)
2221adantr 274 . . . . 5 ((𝜑𝑢 ∈ (𝐴 × 𝐶)) → ∀𝑦𝐶 𝑌𝐷)
23 nfcsb1v 3038 . . . . . . 7 𝑦(2nd𝑢) / 𝑦𝑌
2423nfel1 2293 . . . . . 6 𝑦(2nd𝑢) / 𝑦𝑌𝐷
25 csbeq1a 3015 . . . . . . 7 (𝑦 = (2nd𝑢) → 𝑌 = (2nd𝑢) / 𝑦𝑌)
2625eleq1d 2209 . . . . . 6 (𝑦 = (2nd𝑢) → (𝑌𝐷(2nd𝑢) / 𝑦𝑌𝐷))
2724, 26rspc 2786 . . . . 5 ((2nd𝑢) ∈ 𝐶 → (∀𝑦𝐶 𝑌𝐷(2nd𝑢) / 𝑦𝑌𝐷))
2816, 22, 27sylc 62 . . . 4 ((𝜑𝑢 ∈ (𝐴 × 𝐶)) → (2nd𝑢) / 𝑦𝑌𝐷)
29 opelxpi 4577 . . . 4 (((1st𝑢) / 𝑥𝑋𝐵(2nd𝑢) / 𝑦𝑌𝐷) → ⟨(1st𝑢) / 𝑥𝑋, (2nd𝑢) / 𝑦𝑌⟩ ∈ (𝐵 × 𝐷))
3014, 28, 29syl2anc 409 . . 3 ((𝜑𝑢 ∈ (𝐴 × 𝐶)) → ⟨(1st𝑢) / 𝑥𝑋, (2nd𝑢) / 𝑦𝑌⟩ ∈ (𝐵 × 𝐷))
3130ralrimiva 2508 . 2 (𝜑 → ∀𝑢 ∈ (𝐴 × 𝐶)⟨(1st𝑢) / 𝑥𝑋, (2nd𝑢) / 𝑦𝑌⟩ ∈ (𝐵 × 𝐷))
326simprd 113 . . . . . . . . . 10 (𝜑 → ∀𝑧𝐵 ∃!𝑥𝐴 𝑧 = 𝑋)
3332r19.21bi 2523 . . . . . . . . 9 ((𝜑𝑧𝐵) → ∃!𝑥𝐴 𝑧 = 𝑋)
34 reu6 2876 . . . . . . . . 9 (∃!𝑥𝐴 𝑧 = 𝑋 ↔ ∃𝑠𝐴𝑥𝐴 (𝑧 = 𝑋𝑥 = 𝑠))
3533, 34sylib 121 . . . . . . . 8 ((𝜑𝑧𝐵) → ∃𝑠𝐴𝑥𝐴 (𝑧 = 𝑋𝑥 = 𝑠))
3620simprd 113 . . . . . . . . . 10 (𝜑 → ∀𝑤𝐷 ∃!𝑦𝐶 𝑤 = 𝑌)
3736r19.21bi 2523 . . . . . . . . 9 ((𝜑𝑤𝐷) → ∃!𝑦𝐶 𝑤 = 𝑌)
38 reu6 2876 . . . . . . . . 9 (∃!𝑦𝐶 𝑤 = 𝑌 ↔ ∃𝑡𝐶𝑦𝐶 (𝑤 = 𝑌𝑦 = 𝑡))
3937, 38sylib 121 . . . . . . . 8 ((𝜑𝑤𝐷) → ∃𝑡𝐶𝑦𝐶 (𝑤 = 𝑌𝑦 = 𝑡))
4035, 39anim12dan 590 . . . . . . 7 ((𝜑 ∧ (𝑧𝐵𝑤𝐷)) → (∃𝑠𝐴𝑥𝐴 (𝑧 = 𝑋𝑥 = 𝑠) ∧ ∃𝑡𝐶𝑦𝐶 (𝑤 = 𝑌𝑦 = 𝑡)))
41 reeanv 2603 . . . . . . . 8 (∃𝑠𝐴𝑡𝐶 (∀𝑥𝐴 (𝑧 = 𝑋𝑥 = 𝑠) ∧ ∀𝑦𝐶 (𝑤 = 𝑌𝑦 = 𝑡)) ↔ (∃𝑠𝐴𝑥𝐴 (𝑧 = 𝑋𝑥 = 𝑠) ∧ ∃𝑡𝐶𝑦𝐶 (𝑤 = 𝑌𝑦 = 𝑡)))
42 pm4.38 595 . . . . . . . . . . . . . . 15 (((𝑧 = 𝑋𝑥 = 𝑠) ∧ (𝑤 = 𝑌𝑦 = 𝑡)) → ((𝑧 = 𝑋𝑤 = 𝑌) ↔ (𝑥 = 𝑠𝑦 = 𝑡)))
4342ex 114 . . . . . . . . . . . . . 14 ((𝑧 = 𝑋𝑥 = 𝑠) → ((𝑤 = 𝑌𝑦 = 𝑡) → ((𝑧 = 𝑋𝑤 = 𝑌) ↔ (𝑥 = 𝑠𝑦 = 𝑡))))
4443ralimdv 2503 . . . . . . . . . . . . 13 ((𝑧 = 𝑋𝑥 = 𝑠) → (∀𝑦𝐶 (𝑤 = 𝑌𝑦 = 𝑡) → ∀𝑦𝐶 ((𝑧 = 𝑋𝑤 = 𝑌) ↔ (𝑥 = 𝑠𝑦 = 𝑡))))
4544com12 30 . . . . . . . . . . . 12 (∀𝑦𝐶 (𝑤 = 𝑌𝑦 = 𝑡) → ((𝑧 = 𝑋𝑥 = 𝑠) → ∀𝑦𝐶 ((𝑧 = 𝑋𝑤 = 𝑌) ↔ (𝑥 = 𝑠𝑦 = 𝑡))))
4645ralimdv 2503 . . . . . . . . . . 11 (∀𝑦𝐶 (𝑤 = 𝑌𝑦 = 𝑡) → (∀𝑥𝐴 (𝑧 = 𝑋𝑥 = 𝑠) → ∀𝑥𝐴𝑦𝐶 ((𝑧 = 𝑋𝑤 = 𝑌) ↔ (𝑥 = 𝑠𝑦 = 𝑡))))
4746impcom 124 . . . . . . . . . 10 ((∀𝑥𝐴 (𝑧 = 𝑋𝑥 = 𝑠) ∧ ∀𝑦𝐶 (𝑤 = 𝑌𝑦 = 𝑡)) → ∀𝑥𝐴𝑦𝐶 ((𝑧 = 𝑋𝑤 = 𝑌) ↔ (𝑥 = 𝑠𝑦 = 𝑡)))
4847reximi 2532 . . . . . . . . 9 (∃𝑡𝐶 (∀𝑥𝐴 (𝑧 = 𝑋𝑥 = 𝑠) ∧ ∀𝑦𝐶 (𝑤 = 𝑌𝑦 = 𝑡)) → ∃𝑡𝐶𝑥𝐴𝑦𝐶 ((𝑧 = 𝑋𝑤 = 𝑌) ↔ (𝑥 = 𝑠𝑦 = 𝑡)))
4948reximi 2532 . . . . . . . 8 (∃𝑠𝐴𝑡𝐶 (∀𝑥𝐴 (𝑧 = 𝑋𝑥 = 𝑠) ∧ ∀𝑦𝐶 (𝑤 = 𝑌𝑦 = 𝑡)) → ∃𝑠𝐴𝑡𝐶𝑥𝐴𝑦𝐶 ((𝑧 = 𝑋𝑤 = 𝑌) ↔ (𝑥 = 𝑠𝑦 = 𝑡)))
5041, 49sylbir 134 . . . . . . 7 ((∃𝑠𝐴𝑥𝐴 (𝑧 = 𝑋𝑥 = 𝑠) ∧ ∃𝑡𝐶𝑦𝐶 (𝑤 = 𝑌𝑦 = 𝑡)) → ∃𝑠𝐴𝑡𝐶𝑥𝐴𝑦𝐶 ((𝑧 = 𝑋𝑤 = 𝑌) ↔ (𝑥 = 𝑠𝑦 = 𝑡)))
5140, 50syl 14 . . . . . 6 ((𝜑 ∧ (𝑧𝐵𝑤𝐷)) → ∃𝑠𝐴𝑡𝐶𝑥𝐴𝑦𝐶 ((𝑧 = 𝑋𝑤 = 𝑌) ↔ (𝑥 = 𝑠𝑦 = 𝑡)))
52 vex 2692 . . . . . . . . . . . . . . 15 𝑠 ∈ V
53 vex 2692 . . . . . . . . . . . . . . 15 𝑡 ∈ V
5452, 53op1std 6052 . . . . . . . . . . . . . 14 (𝑢 = ⟨𝑠, 𝑡⟩ → (1st𝑢) = 𝑠)
5554csbeq1d 3013 . . . . . . . . . . . . 13 (𝑢 = ⟨𝑠, 𝑡⟩ → (1st𝑢) / 𝑥𝑋 = 𝑠 / 𝑥𝑋)
5655eqeq2d 2152 . . . . . . . . . . . 12 (𝑢 = ⟨𝑠, 𝑡⟩ → (𝑧 = (1st𝑢) / 𝑥𝑋𝑧 = 𝑠 / 𝑥𝑋))
5752, 53op2ndd 6053 . . . . . . . . . . . . . 14 (𝑢 = ⟨𝑠, 𝑡⟩ → (2nd𝑢) = 𝑡)
5857csbeq1d 3013 . . . . . . . . . . . . 13 (𝑢 = ⟨𝑠, 𝑡⟩ → (2nd𝑢) / 𝑦𝑌 = 𝑡 / 𝑦𝑌)
5958eqeq2d 2152 . . . . . . . . . . . 12 (𝑢 = ⟨𝑠, 𝑡⟩ → (𝑤 = (2nd𝑢) / 𝑦𝑌𝑤 = 𝑡 / 𝑦𝑌))
6056, 59anbi12d 465 . . . . . . . . . . 11 (𝑢 = ⟨𝑠, 𝑡⟩ → ((𝑧 = (1st𝑢) / 𝑥𝑋𝑤 = (2nd𝑢) / 𝑦𝑌) ↔ (𝑧 = 𝑠 / 𝑥𝑋𝑤 = 𝑡 / 𝑦𝑌)))
61 eqeq1 2147 . . . . . . . . . . 11 (𝑢 = ⟨𝑠, 𝑡⟩ → (𝑢 = 𝑣 ↔ ⟨𝑠, 𝑡⟩ = 𝑣))
6260, 61bibi12d 234 . . . . . . . . . 10 (𝑢 = ⟨𝑠, 𝑡⟩ → (((𝑧 = (1st𝑢) / 𝑥𝑋𝑤 = (2nd𝑢) / 𝑦𝑌) ↔ 𝑢 = 𝑣) ↔ ((𝑧 = 𝑠 / 𝑥𝑋𝑤 = 𝑡 / 𝑦𝑌) ↔ ⟨𝑠, 𝑡⟩ = 𝑣)))
6362ralxp 4688 . . . . . . . . 9 (∀𝑢 ∈ (𝐴 × 𝐶)((𝑧 = (1st𝑢) / 𝑥𝑋𝑤 = (2nd𝑢) / 𝑦𝑌) ↔ 𝑢 = 𝑣) ↔ ∀𝑠𝐴𝑡𝐶 ((𝑧 = 𝑠 / 𝑥𝑋𝑤 = 𝑡 / 𝑦𝑌) ↔ ⟨𝑠, 𝑡⟩ = 𝑣))
64 nfv 1509 . . . . . . . . . 10 𝑠𝑦𝐶 ((𝑧 = 𝑋𝑤 = 𝑌) ↔ ⟨𝑥, 𝑦⟩ = 𝑣)
65 nfcv 2282 . . . . . . . . . . 11 𝑥𝐶
66 nfcsb1v 3038 . . . . . . . . . . . . . 14 𝑥𝑠 / 𝑥𝑋
6766nfeq2 2294 . . . . . . . . . . . . 13 𝑥 𝑧 = 𝑠 / 𝑥𝑋
68 nfv 1509 . . . . . . . . . . . . 13 𝑥 𝑤 = 𝑡 / 𝑦𝑌
6967, 68nfan 1545 . . . . . . . . . . . 12 𝑥(𝑧 = 𝑠 / 𝑥𝑋𝑤 = 𝑡 / 𝑦𝑌)
70 nfv 1509 . . . . . . . . . . . 12 𝑥𝑠, 𝑡⟩ = 𝑣
7169, 70nfbi 1569 . . . . . . . . . . 11 𝑥((𝑧 = 𝑠 / 𝑥𝑋𝑤 = 𝑡 / 𝑦𝑌) ↔ ⟨𝑠, 𝑡⟩ = 𝑣)
7265, 71nfralxy 2474 . . . . . . . . . 10 𝑥𝑡𝐶 ((𝑧 = 𝑠 / 𝑥𝑋𝑤 = 𝑡 / 𝑦𝑌) ↔ ⟨𝑠, 𝑡⟩ = 𝑣)
73 nfv 1509 . . . . . . . . . . . 12 𝑡((𝑧 = 𝑋𝑤 = 𝑌) ↔ ⟨𝑥, 𝑦⟩ = 𝑣)
74 nfv 1509 . . . . . . . . . . . . . 14 𝑦 𝑧 = 𝑋
75 nfcsb1v 3038 . . . . . . . . . . . . . . 15 𝑦𝑡 / 𝑦𝑌
7675nfeq2 2294 . . . . . . . . . . . . . 14 𝑦 𝑤 = 𝑡 / 𝑦𝑌
7774, 76nfan 1545 . . . . . . . . . . . . 13 𝑦(𝑧 = 𝑋𝑤 = 𝑡 / 𝑦𝑌)
78 nfv 1509 . . . . . . . . . . . . 13 𝑦𝑥, 𝑡⟩ = 𝑣
7977, 78nfbi 1569 . . . . . . . . . . . 12 𝑦((𝑧 = 𝑋𝑤 = 𝑡 / 𝑦𝑌) ↔ ⟨𝑥, 𝑡⟩ = 𝑣)
80 csbeq1a 3015 . . . . . . . . . . . . . . 15 (𝑦 = 𝑡𝑌 = 𝑡 / 𝑦𝑌)
8180eqeq2d 2152 . . . . . . . . . . . . . 14 (𝑦 = 𝑡 → (𝑤 = 𝑌𝑤 = 𝑡 / 𝑦𝑌))
8281anbi2d 460 . . . . . . . . . . . . 13 (𝑦 = 𝑡 → ((𝑧 = 𝑋𝑤 = 𝑌) ↔ (𝑧 = 𝑋𝑤 = 𝑡 / 𝑦𝑌)))
83 opeq2 3712 . . . . . . . . . . . . . 14 (𝑦 = 𝑡 → ⟨𝑥, 𝑦⟩ = ⟨𝑥, 𝑡⟩)
8483eqeq1d 2149 . . . . . . . . . . . . 13 (𝑦 = 𝑡 → (⟨𝑥, 𝑦⟩ = 𝑣 ↔ ⟨𝑥, 𝑡⟩ = 𝑣))
8582, 84bibi12d 234 . . . . . . . . . . . 12 (𝑦 = 𝑡 → (((𝑧 = 𝑋𝑤 = 𝑌) ↔ ⟨𝑥, 𝑦⟩ = 𝑣) ↔ ((𝑧 = 𝑋𝑤 = 𝑡 / 𝑦𝑌) ↔ ⟨𝑥, 𝑡⟩ = 𝑣)))
8673, 79, 85cbvral 2653 . . . . . . . . . . 11 (∀𝑦𝐶 ((𝑧 = 𝑋𝑤 = 𝑌) ↔ ⟨𝑥, 𝑦⟩ = 𝑣) ↔ ∀𝑡𝐶 ((𝑧 = 𝑋𝑤 = 𝑡 / 𝑦𝑌) ↔ ⟨𝑥, 𝑡⟩ = 𝑣))
87 csbeq1a 3015 . . . . . . . . . . . . . . 15 (𝑥 = 𝑠𝑋 = 𝑠 / 𝑥𝑋)
8887eqeq2d 2152 . . . . . . . . . . . . . 14 (𝑥 = 𝑠 → (𝑧 = 𝑋𝑧 = 𝑠 / 𝑥𝑋))
8988anbi1d 461 . . . . . . . . . . . . 13 (𝑥 = 𝑠 → ((𝑧 = 𝑋𝑤 = 𝑡 / 𝑦𝑌) ↔ (𝑧 = 𝑠 / 𝑥𝑋𝑤 = 𝑡 / 𝑦𝑌)))
90 opeq1 3711 . . . . . . . . . . . . . 14 (𝑥 = 𝑠 → ⟨𝑥, 𝑡⟩ = ⟨𝑠, 𝑡⟩)
9190eqeq1d 2149 . . . . . . . . . . . . 13 (𝑥 = 𝑠 → (⟨𝑥, 𝑡⟩ = 𝑣 ↔ ⟨𝑠, 𝑡⟩ = 𝑣))
9289, 91bibi12d 234 . . . . . . . . . . . 12 (𝑥 = 𝑠 → (((𝑧 = 𝑋𝑤 = 𝑡 / 𝑦𝑌) ↔ ⟨𝑥, 𝑡⟩ = 𝑣) ↔ ((𝑧 = 𝑠 / 𝑥𝑋𝑤 = 𝑡 / 𝑦𝑌) ↔ ⟨𝑠, 𝑡⟩ = 𝑣)))
9392ralbidv 2438 . . . . . . . . . . 11 (𝑥 = 𝑠 → (∀𝑡𝐶 ((𝑧 = 𝑋𝑤 = 𝑡 / 𝑦𝑌) ↔ ⟨𝑥, 𝑡⟩ = 𝑣) ↔ ∀𝑡𝐶 ((𝑧 = 𝑠 / 𝑥𝑋𝑤 = 𝑡 / 𝑦𝑌) ↔ ⟨𝑠, 𝑡⟩ = 𝑣)))
9486, 93syl5bb 191 . . . . . . . . . 10 (𝑥 = 𝑠 → (∀𝑦𝐶 ((𝑧 = 𝑋𝑤 = 𝑌) ↔ ⟨𝑥, 𝑦⟩ = 𝑣) ↔ ∀𝑡𝐶 ((𝑧 = 𝑠 / 𝑥𝑋𝑤 = 𝑡 / 𝑦𝑌) ↔ ⟨𝑠, 𝑡⟩ = 𝑣)))
9564, 72, 94cbvral 2653 . . . . . . . . 9 (∀𝑥𝐴𝑦𝐶 ((𝑧 = 𝑋𝑤 = 𝑌) ↔ ⟨𝑥, 𝑦⟩ = 𝑣) ↔ ∀𝑠𝐴𝑡𝐶 ((𝑧 = 𝑠 / 𝑥𝑋𝑤 = 𝑡 / 𝑦𝑌) ↔ ⟨𝑠, 𝑡⟩ = 𝑣))
9663, 95bitr4i 186 . . . . . . . 8 (∀𝑢 ∈ (𝐴 × 𝐶)((𝑧 = (1st𝑢) / 𝑥𝑋𝑤 = (2nd𝑢) / 𝑦𝑌) ↔ 𝑢 = 𝑣) ↔ ∀𝑥𝐴𝑦𝐶 ((𝑧 = 𝑋𝑤 = 𝑌) ↔ ⟨𝑥, 𝑦⟩ = 𝑣))
97 eqeq2 2150 . . . . . . . . . . 11 (𝑣 = ⟨𝑠, 𝑡⟩ → (⟨𝑥, 𝑦⟩ = 𝑣 ↔ ⟨𝑥, 𝑦⟩ = ⟨𝑠, 𝑡⟩))
98 vex 2692 . . . . . . . . . . . 12 𝑥 ∈ V
99 vex 2692 . . . . . . . . . . . 12 𝑦 ∈ V
10098, 99opth 4165 . . . . . . . . . . 11 (⟨𝑥, 𝑦⟩ = ⟨𝑠, 𝑡⟩ ↔ (𝑥 = 𝑠𝑦 = 𝑡))
10197, 100syl6bb 195 . . . . . . . . . 10 (𝑣 = ⟨𝑠, 𝑡⟩ → (⟨𝑥, 𝑦⟩ = 𝑣 ↔ (𝑥 = 𝑠𝑦 = 𝑡)))
102101bibi2d 231 . . . . . . . . 9 (𝑣 = ⟨𝑠, 𝑡⟩ → (((𝑧 = 𝑋𝑤 = 𝑌) ↔ ⟨𝑥, 𝑦⟩ = 𝑣) ↔ ((𝑧 = 𝑋𝑤 = 𝑌) ↔ (𝑥 = 𝑠𝑦 = 𝑡))))
1031022ralbidv 2462 . . . . . . . 8 (𝑣 = ⟨𝑠, 𝑡⟩ → (∀𝑥𝐴𝑦𝐶 ((𝑧 = 𝑋𝑤 = 𝑌) ↔ ⟨𝑥, 𝑦⟩ = 𝑣) ↔ ∀𝑥𝐴𝑦𝐶 ((𝑧 = 𝑋𝑤 = 𝑌) ↔ (𝑥 = 𝑠𝑦 = 𝑡))))
10496, 103syl5bb 191 . . . . . . 7 (𝑣 = ⟨𝑠, 𝑡⟩ → (∀𝑢 ∈ (𝐴 × 𝐶)((𝑧 = (1st𝑢) / 𝑥𝑋𝑤 = (2nd𝑢) / 𝑦𝑌) ↔ 𝑢 = 𝑣) ↔ ∀𝑥𝐴𝑦𝐶 ((𝑧 = 𝑋𝑤 = 𝑌) ↔ (𝑥 = 𝑠𝑦 = 𝑡))))
105104rexxp 4689 . . . . . 6 (∃𝑣 ∈ (𝐴 × 𝐶)∀𝑢 ∈ (𝐴 × 𝐶)((𝑧 = (1st𝑢) / 𝑥𝑋𝑤 = (2nd𝑢) / 𝑦𝑌) ↔ 𝑢 = 𝑣) ↔ ∃𝑠𝐴𝑡𝐶𝑥𝐴𝑦𝐶 ((𝑧 = 𝑋𝑤 = 𝑌) ↔ (𝑥 = 𝑠𝑦 = 𝑡)))
10651, 105sylibr 133 . . . . 5 ((𝜑 ∧ (𝑧𝐵𝑤𝐷)) → ∃𝑣 ∈ (𝐴 × 𝐶)∀𝑢 ∈ (𝐴 × 𝐶)((𝑧 = (1st𝑢) / 𝑥𝑋𝑤 = (2nd𝑢) / 𝑦𝑌) ↔ 𝑢 = 𝑣))
107 reu6 2876 . . . . 5 (∃!𝑢 ∈ (𝐴 × 𝐶)(𝑧 = (1st𝑢) / 𝑥𝑋𝑤 = (2nd𝑢) / 𝑦𝑌) ↔ ∃𝑣 ∈ (𝐴 × 𝐶)∀𝑢 ∈ (𝐴 × 𝐶)((𝑧 = (1st𝑢) / 𝑥𝑋𝑤 = (2nd𝑢) / 𝑦𝑌) ↔ 𝑢 = 𝑣))
108106, 107sylibr 133 . . . 4 ((𝜑 ∧ (𝑧𝐵𝑤𝐷)) → ∃!𝑢 ∈ (𝐴 × 𝐶)(𝑧 = (1st𝑢) / 𝑥𝑋𝑤 = (2nd𝑢) / 𝑦𝑌))
109108ralrimivva 2517 . . 3 (𝜑 → ∀𝑧𝐵𝑤𝐷 ∃!𝑢 ∈ (𝐴 × 𝐶)(𝑧 = (1st𝑢) / 𝑥𝑋𝑤 = (2nd𝑢) / 𝑦𝑌))
110 eqeq1 2147 . . . . . 6 (𝑣 = ⟨𝑧, 𝑤⟩ → (𝑣 = ⟨(1st𝑢) / 𝑥𝑋, (2nd𝑢) / 𝑦𝑌⟩ ↔ ⟨𝑧, 𝑤⟩ = ⟨(1st𝑢) / 𝑥𝑋, (2nd𝑢) / 𝑦𝑌⟩))
111 vex 2692 . . . . . . 7 𝑧 ∈ V
112 vex 2692 . . . . . . 7 𝑤 ∈ V
113111, 112opth 4165 . . . . . 6 (⟨𝑧, 𝑤⟩ = ⟨(1st𝑢) / 𝑥𝑋, (2nd𝑢) / 𝑦𝑌⟩ ↔ (𝑧 = (1st𝑢) / 𝑥𝑋𝑤 = (2nd𝑢) / 𝑦𝑌))
114110, 113syl6bb 195 . . . . 5 (𝑣 = ⟨𝑧, 𝑤⟩ → (𝑣 = ⟨(1st𝑢) / 𝑥𝑋, (2nd𝑢) / 𝑦𝑌⟩ ↔ (𝑧 = (1st𝑢) / 𝑥𝑋𝑤 = (2nd𝑢) / 𝑦𝑌)))
115114reubidv 2617 . . . 4 (𝑣 = ⟨𝑧, 𝑤⟩ → (∃!𝑢 ∈ (𝐴 × 𝐶)𝑣 = ⟨(1st𝑢) / 𝑥𝑋, (2nd𝑢) / 𝑦𝑌⟩ ↔ ∃!𝑢 ∈ (𝐴 × 𝐶)(𝑧 = (1st𝑢) / 𝑥𝑋𝑤 = (2nd𝑢) / 𝑦𝑌)))
116115ralxp 4688 . . 3 (∀𝑣 ∈ (𝐵 × 𝐷)∃!𝑢 ∈ (𝐴 × 𝐶)𝑣 = ⟨(1st𝑢) / 𝑥𝑋, (2nd𝑢) / 𝑦𝑌⟩ ↔ ∀𝑧𝐵𝑤𝐷 ∃!𝑢 ∈ (𝐴 × 𝐶)(𝑧 = (1st𝑢) / 𝑥𝑋𝑤 = (2nd𝑢) / 𝑦𝑌))
117109, 116sylibr 133 . 2 (𝜑 → ∀𝑣 ∈ (𝐵 × 𝐷)∃!𝑢 ∈ (𝐴 × 𝐶)𝑣 = ⟨(1st𝑢) / 𝑥𝑋, (2nd𝑢) / 𝑦𝑌⟩)
118 nfcv 2282 . . . . 5 𝑧𝑋, 𝑌
119 nfcv 2282 . . . . 5 𝑤𝑋, 𝑌
120 nfcsb1v 3038 . . . . . 6 𝑥𝑧 / 𝑥𝑋
121 nfcv 2282 . . . . . 6 𝑥𝑤 / 𝑦𝑌
122120, 121nfop 3727 . . . . 5 𝑥𝑧 / 𝑥𝑋, 𝑤 / 𝑦𝑌
123 nfcv 2282 . . . . . 6 𝑦𝑧 / 𝑥𝑋
124 nfcsb1v 3038 . . . . . 6 𝑦𝑤 / 𝑦𝑌
125123, 124nfop 3727 . . . . 5 𝑦𝑧 / 𝑥𝑋, 𝑤 / 𝑦𝑌
126 csbeq1a 3015 . . . . . 6 (𝑥 = 𝑧𝑋 = 𝑧 / 𝑥𝑋)
127 csbeq1a 3015 . . . . . 6 (𝑦 = 𝑤𝑌 = 𝑤 / 𝑦𝑌)
128 opeq12 3713 . . . . . 6 ((𝑋 = 𝑧 / 𝑥𝑋𝑌 = 𝑤 / 𝑦𝑌) → ⟨𝑋, 𝑌⟩ = ⟨𝑧 / 𝑥𝑋, 𝑤 / 𝑦𝑌⟩)
129126, 127, 128syl2an 287 . . . . 5 ((𝑥 = 𝑧𝑦 = 𝑤) → ⟨𝑋, 𝑌⟩ = ⟨𝑧 / 𝑥𝑋, 𝑤 / 𝑦𝑌⟩)
130118, 119, 122, 125, 129cbvmpo 5856 . . . 4 (𝑥𝐴, 𝑦𝐶 ↦ ⟨𝑋, 𝑌⟩) = (𝑧𝐴, 𝑤𝐶 ↦ ⟨𝑧 / 𝑥𝑋, 𝑤 / 𝑦𝑌⟩)
131111, 112op1std 6052 . . . . . . 7 (𝑢 = ⟨𝑧, 𝑤⟩ → (1st𝑢) = 𝑧)
132131csbeq1d 3013 . . . . . 6 (𝑢 = ⟨𝑧, 𝑤⟩ → (1st𝑢) / 𝑥𝑋 = 𝑧 / 𝑥𝑋)
133111, 112op2ndd 6053 . . . . . . 7 (𝑢 = ⟨𝑧, 𝑤⟩ → (2nd𝑢) = 𝑤)
134133csbeq1d 3013 . . . . . 6 (𝑢 = ⟨𝑧, 𝑤⟩ → (2nd𝑢) / 𝑦𝑌 = 𝑤 / 𝑦𝑌)
135132, 134opeq12d 3719 . . . . 5 (𝑢 = ⟨𝑧, 𝑤⟩ → ⟨(1st𝑢) / 𝑥𝑋, (2nd𝑢) / 𝑦𝑌⟩ = ⟨𝑧 / 𝑥𝑋, 𝑤 / 𝑦𝑌⟩)
136135mpompt 5869 . . . 4 (𝑢 ∈ (𝐴 × 𝐶) ↦ ⟨(1st𝑢) / 𝑥𝑋, (2nd𝑢) / 𝑦𝑌⟩) = (𝑧𝐴, 𝑤𝐶 ↦ ⟨𝑧 / 𝑥𝑋, 𝑤 / 𝑦𝑌⟩)
137130, 136eqtr4i 2164 . . 3 (𝑥𝐴, 𝑦𝐶 ↦ ⟨𝑋, 𝑌⟩) = (𝑢 ∈ (𝐴 × 𝐶) ↦ ⟨(1st𝑢) / 𝑥𝑋, (2nd𝑢) / 𝑦𝑌⟩)
138137f1ompt 5577 . 2 ((𝑥𝐴, 𝑦𝐶 ↦ ⟨𝑋, 𝑌⟩):(𝐴 × 𝐶)–1-1-onto→(𝐵 × 𝐷) ↔ (∀𝑢 ∈ (𝐴 × 𝐶)⟨(1st𝑢) / 𝑥𝑋, (2nd𝑢) / 𝑦𝑌⟩ ∈ (𝐵 × 𝐷) ∧ ∀𝑣 ∈ (𝐵 × 𝐷)∃!𝑢 ∈ (𝐴 × 𝐶)𝑣 = ⟨(1st𝑢) / 𝑥𝑋, (2nd𝑢) / 𝑦𝑌⟩))
13931, 117, 138sylanbrc 414 1 (𝜑 → (𝑥𝐴, 𝑦𝐶 ↦ ⟨𝑋, 𝑌⟩):(𝐴 × 𝐶)–1-1-onto→(𝐵 × 𝐷))
 Colors of variables: wff set class Syntax hints:   → wi 4   ∧ wa 103   ↔ wb 104   = wceq 1332   ∈ wcel 1481  ∀wral 2417  ∃wrex 2418  ∃!wreu 2419  ⦋csb 3006  ⟨cop 3533   ↦ cmpt 3995   × cxp 4543  –1-1-onto→wf1o 5128  ‘cfv 5129   ∈ cmpo 5782  1st c1st 6042  2nd c2nd 6043 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 699  ax-5 1424  ax-7 1425  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1483  ax-10 1484  ax-11 1485  ax-i12 1486  ax-bndl 1487  ax-4 1488  ax-13 1492  ax-14 1493  ax-17 1507  ax-i9 1511  ax-ial 1515  ax-i5r 1516  ax-ext 2122  ax-sep 4052  ax-pow 4104  ax-pr 4137  ax-un 4361 This theorem depends on definitions:  df-bi 116  df-3an 965  df-tru 1335  df-nf 1438  df-sb 1737  df-eu 2003  df-mo 2004  df-clab 2127  df-cleq 2133  df-clel 2136  df-nfc 2271  df-ral 2422  df-rex 2423  df-reu 2424  df-rab 2426  df-v 2691  df-sbc 2913  df-csb 3007  df-un 3078  df-in 3080  df-ss 3087  df-pw 3515  df-sn 3536  df-pr 3537  df-op 3539  df-uni 3743  df-iun 3821  df-br 3936  df-opab 3996  df-mpt 3997  df-id 4221  df-xp 4551  df-rel 4552  df-cnv 4553  df-co 4554  df-dm 4555  df-rn 4556  df-res 4557  df-ima 4558  df-iota 5094  df-fun 5131  df-fn 5132  df-f 5133  df-f1 5134  df-fo 5135  df-f1o 5136  df-fv 5137  df-oprab 5784  df-mpo 5785  df-1st 6044  df-2nd 6045 This theorem is referenced by:  xpen  6745
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