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Theorem disjinfi 42738
Description: Only a finite number of disjoint sets can have a nonempty intersection with a finite set 𝐶. (Contributed by Glauco Siliprandi, 17-Aug-2020.)
Hypotheses
Ref Expression
disjinfi.b ((𝜑𝑥𝐴) → 𝐵𝑉)
disjinfi.d (𝜑Disj 𝑥𝐴 𝐵)
disjinfi.c (𝜑𝐶 ∈ Fin)
Assertion
Ref Expression
disjinfi (𝜑 → {𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅} ∈ Fin)
Distinct variable groups:   𝑥,𝐴   𝑥,𝐶   𝑥,𝑉   𝜑,𝑥
Allowed substitution hint:   𝐵(𝑥)

Proof of Theorem disjinfi
Dummy variables 𝑤 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 disjinfi.c . . 3 (𝜑𝐶 ∈ Fin)
2 inss2 4164 . . 3 ( ran (𝑥𝐴𝐵) ∩ 𝐶) ⊆ 𝐶
3 ssfi 8965 . . 3 ((𝐶 ∈ Fin ∧ ( ran (𝑥𝐴𝐵) ∩ 𝐶) ⊆ 𝐶) → ( ran (𝑥𝐴𝐵) ∩ 𝐶) ∈ Fin)
41, 2, 3sylancl 586 . 2 (𝜑 → ( ran (𝑥𝐴𝐵) ∩ 𝐶) ∈ Fin)
52a1i 11 . . . 4 (𝜑 → ( ran (𝑥𝐴𝐵) ∩ 𝐶) ⊆ 𝐶)
61, 5ssexd 5249 . . 3 (𝜑 → ( ran (𝑥𝐴𝐵) ∩ 𝐶) ∈ V)
7 elinel1 4130 . . . . . . . . . 10 (𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶) → 𝑦 ran (𝑥𝐴𝐵))
8 eluni2 4844 . . . . . . . . . . . 12 (𝑦 ran (𝑥𝐴𝐵) ↔ ∃𝑤 ∈ ran (𝑥𝐴𝐵)𝑦𝑤)
98biimpi 215 . . . . . . . . . . 11 (𝑦 ran (𝑥𝐴𝐵) → ∃𝑤 ∈ ran (𝑥𝐴𝐵)𝑦𝑤)
10 eqid 2739 . . . . . . . . . . . . . . . . . . 19 (𝑥𝐴𝐵) = (𝑥𝐴𝐵)
1110elrnmpt 5868 . . . . . . . . . . . . . . . . . 18 (𝑤 ∈ V → (𝑤 ∈ ran (𝑥𝐴𝐵) ↔ ∃𝑥𝐴 𝑤 = 𝐵))
1211elv 3439 . . . . . . . . . . . . . . . . 17 (𝑤 ∈ ran (𝑥𝐴𝐵) ↔ ∃𝑥𝐴 𝑤 = 𝐵)
1312biimpi 215 . . . . . . . . . . . . . . . 16 (𝑤 ∈ ran (𝑥𝐴𝐵) → ∃𝑥𝐴 𝑤 = 𝐵)
1413adantr 481 . . . . . . . . . . . . . . 15 ((𝑤 ∈ ran (𝑥𝐴𝐵) ∧ 𝑦𝑤) → ∃𝑥𝐴 𝑤 = 𝐵)
15 nfmpt1 5183 . . . . . . . . . . . . . . . . . . 19 𝑥(𝑥𝐴𝐵)
1615nfrn 5864 . . . . . . . . . . . . . . . . . 18 𝑥ran (𝑥𝐴𝐵)
1716nfcri 2895 . . . . . . . . . . . . . . . . 17 𝑥 𝑤 ∈ ran (𝑥𝐴𝐵)
18 nfv 1918 . . . . . . . . . . . . . . . . 17 𝑥 𝑦𝑤
1917, 18nfan 1903 . . . . . . . . . . . . . . . 16 𝑥(𝑤 ∈ ran (𝑥𝐴𝐵) ∧ 𝑦𝑤)
20 simpl 483 . . . . . . . . . . . . . . . . . . . 20 ((𝑦𝑤𝑤 = 𝐵) → 𝑦𝑤)
21 simpr 485 . . . . . . . . . . . . . . . . . . . 20 ((𝑦𝑤𝑤 = 𝐵) → 𝑤 = 𝐵)
2220, 21eleqtrd 2842 . . . . . . . . . . . . . . . . . . 19 ((𝑦𝑤𝑤 = 𝐵) → 𝑦𝐵)
2322ex 413 . . . . . . . . . . . . . . . . . 18 (𝑦𝑤 → (𝑤 = 𝐵𝑦𝐵))
2423a1d 25 . . . . . . . . . . . . . . . . 17 (𝑦𝑤 → (𝑥𝐴 → (𝑤 = 𝐵𝑦𝐵)))
2524adantl 482 . . . . . . . . . . . . . . . 16 ((𝑤 ∈ ran (𝑥𝐴𝐵) ∧ 𝑦𝑤) → (𝑥𝐴 → (𝑤 = 𝐵𝑦𝐵)))
2619, 25reximdai 3245 . . . . . . . . . . . . . . 15 ((𝑤 ∈ ran (𝑥𝐴𝐵) ∧ 𝑦𝑤) → (∃𝑥𝐴 𝑤 = 𝐵 → ∃𝑥𝐴 𝑦𝐵))
2714, 26mpd 15 . . . . . . . . . . . . . 14 ((𝑤 ∈ ran (𝑥𝐴𝐵) ∧ 𝑦𝑤) → ∃𝑥𝐴 𝑦𝐵)
2827ex 413 . . . . . . . . . . . . 13 (𝑤 ∈ ran (𝑥𝐴𝐵) → (𝑦𝑤 → ∃𝑥𝐴 𝑦𝐵))
2928a1i 11 . . . . . . . . . . . 12 (𝑦 ran (𝑥𝐴𝐵) → (𝑤 ∈ ran (𝑥𝐴𝐵) → (𝑦𝑤 → ∃𝑥𝐴 𝑦𝐵)))
3029rexlimdv 3213 . . . . . . . . . . 11 (𝑦 ran (𝑥𝐴𝐵) → (∃𝑤 ∈ ran (𝑥𝐴𝐵)𝑦𝑤 → ∃𝑥𝐴 𝑦𝐵))
319, 30mpd 15 . . . . . . . . . 10 (𝑦 ran (𝑥𝐴𝐵) → ∃𝑥𝐴 𝑦𝐵)
327, 31syl 17 . . . . . . . . 9 (𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶) → ∃𝑥𝐴 𝑦𝐵)
3332adantl 482 . . . . . . . 8 ((𝜑𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶)) → ∃𝑥𝐴 𝑦𝐵)
34 nfv 1918 . . . . . . . . . 10 𝑥𝜑
3516nfuni 4847 . . . . . . . . . . . 12 𝑥 ran (𝑥𝐴𝐵)
36 nfcv 2908 . . . . . . . . . . . 12 𝑥𝐶
3735, 36nfin 4151 . . . . . . . . . . 11 𝑥( ran (𝑥𝐴𝐵) ∩ 𝐶)
3837nfcri 2895 . . . . . . . . . 10 𝑥 𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶)
3934, 38nfan 1903 . . . . . . . . 9 𝑥(𝜑𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶))
40 nfre1 3240 . . . . . . . . 9 𝑥𝑥𝐴 𝑦 ∈ (𝐵𝐶)
41 elinel2 4131 . . . . . . . . . . 11 (𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶) → 𝑦𝐶)
42 simp2 1136 . . . . . . . . . . . . 13 ((𝑦𝐶𝑥𝐴𝑦𝐵) → 𝑥𝐴)
43 simpr 485 . . . . . . . . . . . . . 14 ((𝑦𝐶𝑦𝐵) → 𝑦𝐵)
44 simpl 483 . . . . . . . . . . . . . 14 ((𝑦𝐶𝑦𝐵) → 𝑦𝐶)
4543, 44elind 4129 . . . . . . . . . . . . 13 ((𝑦𝐶𝑦𝐵) → 𝑦 ∈ (𝐵𝐶))
46 rspe 3238 . . . . . . . . . . . . 13 ((𝑥𝐴𝑦 ∈ (𝐵𝐶)) → ∃𝑥𝐴 𝑦 ∈ (𝐵𝐶))
4742, 45, 463imp3i2an 1344 . . . . . . . . . . . 12 ((𝑦𝐶𝑥𝐴𝑦𝐵) → ∃𝑥𝐴 𝑦 ∈ (𝐵𝐶))
48473exp 1118 . . . . . . . . . . 11 (𝑦𝐶 → (𝑥𝐴 → (𝑦𝐵 → ∃𝑥𝐴 𝑦 ∈ (𝐵𝐶))))
4941, 48syl 17 . . . . . . . . . 10 (𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶) → (𝑥𝐴 → (𝑦𝐵 → ∃𝑥𝐴 𝑦 ∈ (𝐵𝐶))))
5049adantl 482 . . . . . . . . 9 ((𝜑𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶)) → (𝑥𝐴 → (𝑦𝐵 → ∃𝑥𝐴 𝑦 ∈ (𝐵𝐶))))
5139, 40, 50rexlimd 3251 . . . . . . . 8 ((𝜑𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶)) → (∃𝑥𝐴 𝑦𝐵 → ∃𝑥𝐴 𝑦 ∈ (𝐵𝐶)))
5233, 51mpd 15 . . . . . . 7 ((𝜑𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶)) → ∃𝑥𝐴 𝑦 ∈ (𝐵𝐶))
53 disjinfi.d . . . . . . . . . . . . . . 15 (𝜑Disj 𝑥𝐴 𝐵)
54 disjors 5056 . . . . . . . . . . . . . . 15 (Disj 𝑥𝐴 𝐵 ↔ ∀𝑧𝐴𝑤𝐴 (𝑧 = 𝑤 ∨ (𝑧 / 𝑥𝐵𝑤 / 𝑥𝐵) = ∅))
5553, 54sylib 217 . . . . . . . . . . . . . 14 (𝜑 → ∀𝑧𝐴𝑤𝐴 (𝑧 = 𝑤 ∨ (𝑧 / 𝑥𝐵𝑤 / 𝑥𝐵) = ∅))
56 nfv 1918 . . . . . . . . . . . . . . 15 𝑧𝑤𝐴 (𝑥 = 𝑤 ∨ (𝐵𝑤 / 𝑥𝐵) = ∅)
57 nfcv 2908 . . . . . . . . . . . . . . . 16 𝑥𝐴
58 nfv 1918 . . . . . . . . . . . . . . . . 17 𝑥 𝑧 = 𝑤
59 nfcsb1v 3858 . . . . . . . . . . . . . . . . . . 19 𝑥𝑧 / 𝑥𝐵
60 nfcv 2908 . . . . . . . . . . . . . . . . . . . 20 𝑥𝑤
6160nfcsb1 3857 . . . . . . . . . . . . . . . . . . 19 𝑥𝑤 / 𝑥𝐵
6259, 61nfin 4151 . . . . . . . . . . . . . . . . . 18 𝑥(𝑧 / 𝑥𝐵𝑤 / 𝑥𝐵)
6362nfeq1 2923 . . . . . . . . . . . . . . . . 17 𝑥(𝑧 / 𝑥𝐵𝑤 / 𝑥𝐵) = ∅
6458, 63nfor 1908 . . . . . . . . . . . . . . . 16 𝑥(𝑧 = 𝑤 ∨ (𝑧 / 𝑥𝐵𝑤 / 𝑥𝐵) = ∅)
6557, 64nfralw 3152 . . . . . . . . . . . . . . 15 𝑥𝑤𝐴 (𝑧 = 𝑤 ∨ (𝑧 / 𝑥𝐵𝑤 / 𝑥𝐵) = ∅)
66 equequ1 2029 . . . . . . . . . . . . . . . . 17 (𝑥 = 𝑧 → (𝑥 = 𝑤𝑧 = 𝑤))
67 csbeq1a 3847 . . . . . . . . . . . . . . . . . . 19 (𝑥 = 𝑧𝐵 = 𝑧 / 𝑥𝐵)
6867ineq1d 4146 . . . . . . . . . . . . . . . . . 18 (𝑥 = 𝑧 → (𝐵𝑤 / 𝑥𝐵) = (𝑧 / 𝑥𝐵𝑤 / 𝑥𝐵))
6968eqeq1d 2741 . . . . . . . . . . . . . . . . 17 (𝑥 = 𝑧 → ((𝐵𝑤 / 𝑥𝐵) = ∅ ↔ (𝑧 / 𝑥𝐵𝑤 / 𝑥𝐵) = ∅))
7066, 69orbi12d 916 . . . . . . . . . . . . . . . 16 (𝑥 = 𝑧 → ((𝑥 = 𝑤 ∨ (𝐵𝑤 / 𝑥𝐵) = ∅) ↔ (𝑧 = 𝑤 ∨ (𝑧 / 𝑥𝐵𝑤 / 𝑥𝐵) = ∅)))
7170ralbidv 3113 . . . . . . . . . . . . . . 15 (𝑥 = 𝑧 → (∀𝑤𝐴 (𝑥 = 𝑤 ∨ (𝐵𝑤 / 𝑥𝐵) = ∅) ↔ ∀𝑤𝐴 (𝑧 = 𝑤 ∨ (𝑧 / 𝑥𝐵𝑤 / 𝑥𝐵) = ∅)))
7256, 65, 71cbvralw 3374 . . . . . . . . . . . . . 14 (∀𝑥𝐴𝑤𝐴 (𝑥 = 𝑤 ∨ (𝐵𝑤 / 𝑥𝐵) = ∅) ↔ ∀𝑧𝐴𝑤𝐴 (𝑧 = 𝑤 ∨ (𝑧 / 𝑥𝐵𝑤 / 𝑥𝐵) = ∅))
7355, 72sylibr 233 . . . . . . . . . . . . 13 (𝜑 → ∀𝑥𝐴𝑤𝐴 (𝑥 = 𝑤 ∨ (𝐵𝑤 / 𝑥𝐵) = ∅))
7473r19.21bi 3135 . . . . . . . . . . . 12 ((𝜑𝑥𝐴) → ∀𝑤𝐴 (𝑥 = 𝑤 ∨ (𝐵𝑤 / 𝑥𝐵) = ∅))
75 rspa 3133 . . . . . . . . . . . . 13 ((∀𝑤𝐴 (𝑥 = 𝑤 ∨ (𝐵𝑤 / 𝑥𝐵) = ∅) ∧ 𝑤𝐴) → (𝑥 = 𝑤 ∨ (𝐵𝑤 / 𝑥𝐵) = ∅))
7675orcomd 868 . . . . . . . . . . . 12 ((∀𝑤𝐴 (𝑥 = 𝑤 ∨ (𝐵𝑤 / 𝑥𝐵) = ∅) ∧ 𝑤𝐴) → ((𝐵𝑤 / 𝑥𝐵) = ∅ ∨ 𝑥 = 𝑤))
7774, 76sylan 580 . . . . . . . . . . 11 (((𝜑𝑥𝐴) ∧ 𝑤𝐴) → ((𝐵𝑤 / 𝑥𝐵) = ∅ ∨ 𝑥 = 𝑤))
78 elinel1 4130 . . . . . . . . . . . 12 (𝑦 ∈ (𝐵𝐶) → 𝑦𝐵)
79 sbsbc 3721 . . . . . . . . . . . . . 14 ([𝑤 / 𝑥]𝑦 ∈ (𝐵𝐶) ↔ [𝑤 / 𝑥]𝑦 ∈ (𝐵𝐶))
80 sbcel2 4350 . . . . . . . . . . . . . 14 ([𝑤 / 𝑥]𝑦 ∈ (𝐵𝐶) ↔ 𝑦𝑤 / 𝑥(𝐵𝐶))
81 csbin 4374 . . . . . . . . . . . . . . 15 𝑤 / 𝑥(𝐵𝐶) = (𝑤 / 𝑥𝐵𝑤 / 𝑥𝐶)
8281eleq2i 2831 . . . . . . . . . . . . . 14 (𝑦𝑤 / 𝑥(𝐵𝐶) ↔ 𝑦 ∈ (𝑤 / 𝑥𝐵𝑤 / 𝑥𝐶))
8379, 80, 823bitri 297 . . . . . . . . . . . . 13 ([𝑤 / 𝑥]𝑦 ∈ (𝐵𝐶) ↔ 𝑦 ∈ (𝑤 / 𝑥𝐵𝑤 / 𝑥𝐶))
84 elinel1 4130 . . . . . . . . . . . . 13 (𝑦 ∈ (𝑤 / 𝑥𝐵𝑤 / 𝑥𝐶) → 𝑦𝑤 / 𝑥𝐵)
8583, 84sylbi 216 . . . . . . . . . . . 12 ([𝑤 / 𝑥]𝑦 ∈ (𝐵𝐶) → 𝑦𝑤 / 𝑥𝐵)
86 inelcm 4399 . . . . . . . . . . . . 13 ((𝑦𝐵𝑦𝑤 / 𝑥𝐵) → (𝐵𝑤 / 𝑥𝐵) ≠ ∅)
8786neneqd 2949 . . . . . . . . . . . 12 ((𝑦𝐵𝑦𝑤 / 𝑥𝐵) → ¬ (𝐵𝑤 / 𝑥𝐵) = ∅)
8878, 85, 87syl2an 596 . . . . . . . . . . 11 ((𝑦 ∈ (𝐵𝐶) ∧ [𝑤 / 𝑥]𝑦 ∈ (𝐵𝐶)) → ¬ (𝐵𝑤 / 𝑥𝐵) = ∅)
89 pm2.53 848 . . . . . . . . . . 11 (((𝐵𝑤 / 𝑥𝐵) = ∅ ∨ 𝑥 = 𝑤) → (¬ (𝐵𝑤 / 𝑥𝐵) = ∅ → 𝑥 = 𝑤))
9077, 88, 89syl2im 40 . . . . . . . . . 10 (((𝜑𝑥𝐴) ∧ 𝑤𝐴) → ((𝑦 ∈ (𝐵𝐶) ∧ [𝑤 / 𝑥]𝑦 ∈ (𝐵𝐶)) → 𝑥 = 𝑤))
9190ralrimiva 3104 . . . . . . . . 9 ((𝜑𝑥𝐴) → ∀𝑤𝐴 ((𝑦 ∈ (𝐵𝐶) ∧ [𝑤 / 𝑥]𝑦 ∈ (𝐵𝐶)) → 𝑥 = 𝑤))
9291ralrimiva 3104 . . . . . . . 8 (𝜑 → ∀𝑥𝐴𝑤𝐴 ((𝑦 ∈ (𝐵𝐶) ∧ [𝑤 / 𝑥]𝑦 ∈ (𝐵𝐶)) → 𝑥 = 𝑤))
9392adantr 481 . . . . . . 7 ((𝜑𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶)) → ∀𝑥𝐴𝑤𝐴 ((𝑦 ∈ (𝐵𝐶) ∧ [𝑤 / 𝑥]𝑦 ∈ (𝐵𝐶)) → 𝑥 = 𝑤))
94 reu2 3661 . . . . . . 7 (∃!𝑥𝐴 𝑦 ∈ (𝐵𝐶) ↔ (∃𝑥𝐴 𝑦 ∈ (𝐵𝐶) ∧ ∀𝑥𝐴𝑤𝐴 ((𝑦 ∈ (𝐵𝐶) ∧ [𝑤 / 𝑥]𝑦 ∈ (𝐵𝐶)) → 𝑥 = 𝑤)))
9552, 93, 94sylanbrc 583 . . . . . 6 ((𝜑𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶)) → ∃!𝑥𝐴 𝑦 ∈ (𝐵𝐶))
96 riotacl2 7258 . . . . . 6 (∃!𝑥𝐴 𝑦 ∈ (𝐵𝐶) → (𝑥𝐴 𝑦 ∈ (𝐵𝐶)) ∈ {𝑥𝐴𝑦 ∈ (𝐵𝐶)})
97 nfriota1 7248 . . . . . . . . 9 𝑥(𝑥𝐴 𝑦 ∈ (𝐵𝐶))
9897nfcsb1 3857 . . . . . . . . . . 11 𝑥(𝑥𝐴 𝑦 ∈ (𝐵𝐶)) / 𝑥𝐵
9998, 36nfin 4151 . . . . . . . . . 10 𝑥((𝑥𝐴 𝑦 ∈ (𝐵𝐶)) / 𝑥𝐵𝐶)
10099nfcri 2895 . . . . . . . . 9 𝑥 𝑦 ∈ ((𝑥𝐴 𝑦 ∈ (𝐵𝐶)) / 𝑥𝐵𝐶)
101 csbeq1a 3847 . . . . . . . . . . 11 (𝑥 = (𝑥𝐴 𝑦 ∈ (𝐵𝐶)) → 𝐵 = (𝑥𝐴 𝑦 ∈ (𝐵𝐶)) / 𝑥𝐵)
102101ineq1d 4146 . . . . . . . . . 10 (𝑥 = (𝑥𝐴 𝑦 ∈ (𝐵𝐶)) → (𝐵𝐶) = ((𝑥𝐴 𝑦 ∈ (𝐵𝐶)) / 𝑥𝐵𝐶))
103102eleq2d 2825 . . . . . . . . 9 (𝑥 = (𝑥𝐴 𝑦 ∈ (𝐵𝐶)) → (𝑦 ∈ (𝐵𝐶) ↔ 𝑦 ∈ ((𝑥𝐴 𝑦 ∈ (𝐵𝐶)) / 𝑥𝐵𝐶)))
10497, 57, 100, 103elrabf 3621 . . . . . . . 8 ((𝑥𝐴 𝑦 ∈ (𝐵𝐶)) ∈ {𝑥𝐴𝑦 ∈ (𝐵𝐶)} ↔ ((𝑥𝐴 𝑦 ∈ (𝐵𝐶)) ∈ 𝐴𝑦 ∈ ((𝑥𝐴 𝑦 ∈ (𝐵𝐶)) / 𝑥𝐵𝐶)))
105104simplbi 498 . . . . . . 7 ((𝑥𝐴 𝑦 ∈ (𝐵𝐶)) ∈ {𝑥𝐴𝑦 ∈ (𝐵𝐶)} → (𝑥𝐴 𝑦 ∈ (𝐵𝐶)) ∈ 𝐴)
106104simprbi 497 . . . . . . . 8 ((𝑥𝐴 𝑦 ∈ (𝐵𝐶)) ∈ {𝑥𝐴𝑦 ∈ (𝐵𝐶)} → 𝑦 ∈ ((𝑥𝐴 𝑦 ∈ (𝐵𝐶)) / 𝑥𝐵𝐶))
107106ne0d 4270 . . . . . . 7 ((𝑥𝐴 𝑦 ∈ (𝐵𝐶)) ∈ {𝑥𝐴𝑦 ∈ (𝐵𝐶)} → ((𝑥𝐴 𝑦 ∈ (𝐵𝐶)) / 𝑥𝐵𝐶) ≠ ∅)
108 nfcv 2908 . . . . . . . . 9 𝑥
10999, 108nfne 3046 . . . . . . . 8 𝑥((𝑥𝐴 𝑦 ∈ (𝐵𝐶)) / 𝑥𝐵𝐶) ≠ ∅
110102neeq1d 3004 . . . . . . . 8 (𝑥 = (𝑥𝐴 𝑦 ∈ (𝐵𝐶)) → ((𝐵𝐶) ≠ ∅ ↔ ((𝑥𝐴 𝑦 ∈ (𝐵𝐶)) / 𝑥𝐵𝐶) ≠ ∅))
11197, 57, 109, 110elrabf 3621 . . . . . . 7 ((𝑥𝐴 𝑦 ∈ (𝐵𝐶)) ∈ {𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅} ↔ ((𝑥𝐴 𝑦 ∈ (𝐵𝐶)) ∈ 𝐴 ∧ ((𝑥𝐴 𝑦 ∈ (𝐵𝐶)) / 𝑥𝐵𝐶) ≠ ∅))
112105, 107, 111sylanbrc 583 . . . . . 6 ((𝑥𝐴 𝑦 ∈ (𝐵𝐶)) ∈ {𝑥𝐴𝑦 ∈ (𝐵𝐶)} → (𝑥𝐴 𝑦 ∈ (𝐵𝐶)) ∈ {𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅})
11395, 96, 1123syl 18 . . . . 5 ((𝜑𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶)) → (𝑥𝐴 𝑦 ∈ (𝐵𝐶)) ∈ {𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅})
114113ralrimiva 3104 . . . 4 (𝜑 → ∀𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶)(𝑥𝐴 𝑦 ∈ (𝐵𝐶)) ∈ {𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅})
11561, 36nfin 4151 . . . . . . . . . . . 12 𝑥(𝑤 / 𝑥𝐵𝐶)
116115, 108nfne 3046 . . . . . . . . . . 11 𝑥(𝑤 / 𝑥𝐵𝐶) ≠ ∅
117 csbeq1a 3847 . . . . . . . . . . . . 13 (𝑥 = 𝑤𝐵 = 𝑤 / 𝑥𝐵)
118117ineq1d 4146 . . . . . . . . . . . 12 (𝑥 = 𝑤 → (𝐵𝐶) = (𝑤 / 𝑥𝐵𝐶))
119118neeq1d 3004 . . . . . . . . . . 11 (𝑥 = 𝑤 → ((𝐵𝐶) ≠ ∅ ↔ (𝑤 / 𝑥𝐵𝐶) ≠ ∅))
12060, 57, 116, 119elrabf 3621 . . . . . . . . . 10 (𝑤 ∈ {𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅} ↔ (𝑤𝐴 ∧ (𝑤 / 𝑥𝐵𝐶) ≠ ∅))
121120simprbi 497 . . . . . . . . 9 (𝑤 ∈ {𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅} → (𝑤 / 𝑥𝐵𝐶) ≠ ∅)
122 n0 4281 . . . . . . . . 9 ((𝑤 / 𝑥𝐵𝐶) ≠ ∅ ↔ ∃𝑦 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶))
123121, 122sylib 217 . . . . . . . 8 (𝑤 ∈ {𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅} → ∃𝑦 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶))
124123adantl 482 . . . . . . 7 ((𝜑𝑤 ∈ {𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅}) → ∃𝑦 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶))
125120simplbi 498 . . . . . . . . 9 (𝑤 ∈ {𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅} → 𝑤𝐴)
126 elinel1 4130 . . . . . . . . . . . . . 14 (𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) → 𝑦𝑤 / 𝑥𝐵)
127126adantl 482 . . . . . . . . . . . . 13 (((𝜑𝑤𝐴) ∧ 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → 𝑦𝑤 / 𝑥𝐵)
128 simplr 766 . . . . . . . . . . . . . . 15 (((𝜑𝑤𝐴) ∧ 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → 𝑤𝐴)
129 nfv 1918 . . . . . . . . . . . . . . . . . 18 𝑥(𝜑𝑤𝐴)
13061nfel1 2924 . . . . . . . . . . . . . . . . . 18 𝑥𝑤 / 𝑥𝐵𝑉
131129, 130nfim 1900 . . . . . . . . . . . . . . . . 17 𝑥((𝜑𝑤𝐴) → 𝑤 / 𝑥𝐵𝑉)
132 eleq1w 2822 . . . . . . . . . . . . . . . . . . 19 (𝑥 = 𝑤 → (𝑥𝐴𝑤𝐴))
133132anbi2d 629 . . . . . . . . . . . . . . . . . 18 (𝑥 = 𝑤 → ((𝜑𝑥𝐴) ↔ (𝜑𝑤𝐴)))
134117eleq1d 2824 . . . . . . . . . . . . . . . . . 18 (𝑥 = 𝑤 → (𝐵𝑉𝑤 / 𝑥𝐵𝑉))
135133, 134imbi12d 345 . . . . . . . . . . . . . . . . 17 (𝑥 = 𝑤 → (((𝜑𝑥𝐴) → 𝐵𝑉) ↔ ((𝜑𝑤𝐴) → 𝑤 / 𝑥𝐵𝑉)))
136 disjinfi.b . . . . . . . . . . . . . . . . 17 ((𝜑𝑥𝐴) → 𝐵𝑉)
137131, 135, 136chvarfv 2234 . . . . . . . . . . . . . . . 16 ((𝜑𝑤𝐴) → 𝑤 / 𝑥𝐵𝑉)
138137adantr 481 . . . . . . . . . . . . . . 15 (((𝜑𝑤𝐴) ∧ 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → 𝑤 / 𝑥𝐵𝑉)
139 eqid 2739 . . . . . . . . . . . . . . . 16 (𝑤𝐴𝑤 / 𝑥𝐵) = (𝑤𝐴𝑤 / 𝑥𝐵)
140139elrnmpt1 5870 . . . . . . . . . . . . . . 15 ((𝑤𝐴𝑤 / 𝑥𝐵𝑉) → 𝑤 / 𝑥𝐵 ∈ ran (𝑤𝐴𝑤 / 𝑥𝐵))
141128, 138, 140syl2anc 584 . . . . . . . . . . . . . 14 (((𝜑𝑤𝐴) ∧ 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → 𝑤 / 𝑥𝐵 ∈ ran (𝑤𝐴𝑤 / 𝑥𝐵))
142 nfcv 2908 . . . . . . . . . . . . . . . 16 𝑤𝐵
143117equcoms 2024 . . . . . . . . . . . . . . . . 17 (𝑤 = 𝑥𝐵 = 𝑤 / 𝑥𝐵)
144143eqcomd 2745 . . . . . . . . . . . . . . . 16 (𝑤 = 𝑥𝑤 / 𝑥𝐵 = 𝐵)
14561, 142, 144cbvmpt 5186 . . . . . . . . . . . . . . 15 (𝑤𝐴𝑤 / 𝑥𝐵) = (𝑥𝐴𝐵)
146145rneqi 5849 . . . . . . . . . . . . . 14 ran (𝑤𝐴𝑤 / 𝑥𝐵) = ran (𝑥𝐴𝐵)
147141, 146eleqtrdi 2850 . . . . . . . . . . . . 13 (((𝜑𝑤𝐴) ∧ 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → 𝑤 / 𝑥𝐵 ∈ ran (𝑥𝐴𝐵))
148 elunii 4845 . . . . . . . . . . . . 13 ((𝑦𝑤 / 𝑥𝐵𝑤 / 𝑥𝐵 ∈ ran (𝑥𝐴𝐵)) → 𝑦 ran (𝑥𝐴𝐵))
149127, 147, 148syl2anc 584 . . . . . . . . . . . 12 (((𝜑𝑤𝐴) ∧ 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → 𝑦 ran (𝑥𝐴𝐵))
150 elinel2 4131 . . . . . . . . . . . . 13 (𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) → 𝑦𝐶)
151150adantl 482 . . . . . . . . . . . 12 (((𝜑𝑤𝐴) ∧ 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → 𝑦𝐶)
152149, 151elind 4129 . . . . . . . . . . 11 (((𝜑𝑤𝐴) ∧ 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → 𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶))
153 nfv 1918 . . . . . . . . . . . . 13 𝑤 𝑦 ∈ (𝐵𝐶)
154115nfcri 2895 . . . . . . . . . . . . 13 𝑥 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)
155118eleq2d 2825 . . . . . . . . . . . . 13 (𝑥 = 𝑤 → (𝑦 ∈ (𝐵𝐶) ↔ 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)))
156153, 154, 155cbvriotaw 7250 . . . . . . . . . . . 12 (𝑥𝐴 𝑦 ∈ (𝐵𝐶)) = (𝑤𝐴 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶))
157 simpr 485 . . . . . . . . . . . . 13 (((𝜑𝑤𝐴) ∧ 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶))
158 rspe 3238 . . . . . . . . . . . . . . . 16 ((𝑤𝐴𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → ∃𝑤𝐴 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶))
159158adantll 711 . . . . . . . . . . . . . . 15 (((𝜑𝑤𝐴) ∧ 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → ∃𝑤𝐴 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶))
160 simpll 764 . . . . . . . . . . . . . . . 16 (((𝜑𝑤𝐴) ∧ 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → 𝜑)
161 sbequ 2087 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑤 = 𝑧 → ([𝑤 / 𝑥]𝑦 ∈ (𝐵𝐶) ↔ [𝑧 / 𝑥]𝑦 ∈ (𝐵𝐶)))
162 sbsbc 3721 . . . . . . . . . . . . . . . . . . . . . . . 24 ([𝑧 / 𝑥]𝑦 ∈ (𝐵𝐶) ↔ [𝑧 / 𝑥]𝑦 ∈ (𝐵𝐶))
163162a1i 11 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑤 = 𝑧 → ([𝑧 / 𝑥]𝑦 ∈ (𝐵𝐶) ↔ [𝑧 / 𝑥]𝑦 ∈ (𝐵𝐶)))
164 sbcel2 4350 . . . . . . . . . . . . . . . . . . . . . . . . 25 ([𝑧 / 𝑥]𝑦 ∈ (𝐵𝐶) ↔ 𝑦𝑧 / 𝑥(𝐵𝐶))
165 csbin 4374 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 𝑧 / 𝑥(𝐵𝐶) = (𝑧 / 𝑥𝐵𝑧 / 𝑥𝐶)
166 csbconstg 3852 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 (𝑧 ∈ V → 𝑧 / 𝑥𝐶 = 𝐶)
167166elv 3439 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 𝑧 / 𝑥𝐶 = 𝐶
168167ineq2i 4144 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 (𝑧 / 𝑥𝐵𝑧 / 𝑥𝐶) = (𝑧 / 𝑥𝐵𝐶)
169165, 168eqtri 2767 . . . . . . . . . . . . . . . . . . . . . . . . . 26 𝑧 / 𝑥(𝐵𝐶) = (𝑧 / 𝑥𝐵𝐶)
170169eleq2i 2831 . . . . . . . . . . . . . . . . . . . . . . . . 25 (𝑦𝑧 / 𝑥(𝐵𝐶) ↔ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶))
171164, 170bitri 274 . . . . . . . . . . . . . . . . . . . . . . . 24 ([𝑧 / 𝑥]𝑦 ∈ (𝐵𝐶) ↔ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶))
172171a1i 11 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑤 = 𝑧 → ([𝑧 / 𝑥]𝑦 ∈ (𝐵𝐶) ↔ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶)))
173161, 163, 1723bitrd 305 . . . . . . . . . . . . . . . . . . . . . 22 (𝑤 = 𝑧 → ([𝑤 / 𝑥]𝑦 ∈ (𝐵𝐶) ↔ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶)))
174173anbi2d 629 . . . . . . . . . . . . . . . . . . . . 21 (𝑤 = 𝑧 → ((𝑦 ∈ (𝐵𝐶) ∧ [𝑤 / 𝑥]𝑦 ∈ (𝐵𝐶)) ↔ (𝑦 ∈ (𝐵𝐶) ∧ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶))))
175 equequ2 2030 . . . . . . . . . . . . . . . . . . . . 21 (𝑤 = 𝑧 → (𝑥 = 𝑤𝑥 = 𝑧))
176174, 175imbi12d 345 . . . . . . . . . . . . . . . . . . . 20 (𝑤 = 𝑧 → (((𝑦 ∈ (𝐵𝐶) ∧ [𝑤 / 𝑥]𝑦 ∈ (𝐵𝐶)) → 𝑥 = 𝑤) ↔ ((𝑦 ∈ (𝐵𝐶) ∧ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶)) → 𝑥 = 𝑧)))
177176cbvralvw 3384 . . . . . . . . . . . . . . . . . . 19 (∀𝑤𝐴 ((𝑦 ∈ (𝐵𝐶) ∧ [𝑤 / 𝑥]𝑦 ∈ (𝐵𝐶)) → 𝑥 = 𝑤) ↔ ∀𝑧𝐴 ((𝑦 ∈ (𝐵𝐶) ∧ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶)) → 𝑥 = 𝑧))
178177ralbii 3093 . . . . . . . . . . . . . . . . . 18 (∀𝑥𝐴𝑤𝐴 ((𝑦 ∈ (𝐵𝐶) ∧ [𝑤 / 𝑥]𝑦 ∈ (𝐵𝐶)) → 𝑥 = 𝑤) ↔ ∀𝑥𝐴𝑧𝐴 ((𝑦 ∈ (𝐵𝐶) ∧ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶)) → 𝑥 = 𝑧))
179 nfv 1918 . . . . . . . . . . . . . . . . . . 19 𝑤𝑧𝐴 ((𝑦 ∈ (𝐵𝐶) ∧ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶)) → 𝑥 = 𝑧)
18059, 36nfin 4151 . . . . . . . . . . . . . . . . . . . . . . 23 𝑥(𝑧 / 𝑥𝐵𝐶)
181180nfcri 2895 . . . . . . . . . . . . . . . . . . . . . 22 𝑥 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶)
182154, 181nfan 1903 . . . . . . . . . . . . . . . . . . . . 21 𝑥(𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) ∧ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶))
183 nfv 1918 . . . . . . . . . . . . . . . . . . . . 21 𝑥 𝑤 = 𝑧
184182, 183nfim 1900 . . . . . . . . . . . . . . . . . . . 20 𝑥((𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) ∧ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶)) → 𝑤 = 𝑧)
18557, 184nfralw 3152 . . . . . . . . . . . . . . . . . . 19 𝑥𝑧𝐴 ((𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) ∧ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶)) → 𝑤 = 𝑧)
186155anbi1d 630 . . . . . . . . . . . . . . . . . . . . 21 (𝑥 = 𝑤 → ((𝑦 ∈ (𝐵𝐶) ∧ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶)) ↔ (𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) ∧ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶))))
187 equequ1 2029 . . . . . . . . . . . . . . . . . . . . 21 (𝑥 = 𝑤 → (𝑥 = 𝑧𝑤 = 𝑧))
188186, 187imbi12d 345 . . . . . . . . . . . . . . . . . . . 20 (𝑥 = 𝑤 → (((𝑦 ∈ (𝐵𝐶) ∧ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶)) → 𝑥 = 𝑧) ↔ ((𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) ∧ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶)) → 𝑤 = 𝑧)))
189188ralbidv 3113 . . . . . . . . . . . . . . . . . . 19 (𝑥 = 𝑤 → (∀𝑧𝐴 ((𝑦 ∈ (𝐵𝐶) ∧ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶)) → 𝑥 = 𝑧) ↔ ∀𝑧𝐴 ((𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) ∧ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶)) → 𝑤 = 𝑧)))
190179, 185, 189cbvralw 3374 . . . . . . . . . . . . . . . . . 18 (∀𝑥𝐴𝑧𝐴 ((𝑦 ∈ (𝐵𝐶) ∧ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶)) → 𝑥 = 𝑧) ↔ ∀𝑤𝐴𝑧𝐴 ((𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) ∧ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶)) → 𝑤 = 𝑧))
191 sbsbc 3721 . . . . . . . . . . . . . . . . . . . . . 22 ([𝑧 / 𝑤]𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) ↔ [𝑧 / 𝑤]𝑦 ∈ (𝑤 / 𝑥𝐵𝐶))
192 sbcel2 4350 . . . . . . . . . . . . . . . . . . . . . 22 ([𝑧 / 𝑤]𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) ↔ 𝑦𝑧 / 𝑤(𝑤 / 𝑥𝐵𝐶))
193 csbin 4374 . . . . . . . . . . . . . . . . . . . . . . . 24 𝑧 / 𝑤(𝑤 / 𝑥𝐵𝐶) = (𝑧 / 𝑤𝑤 / 𝑥𝐵𝑧 / 𝑤𝐶)
194 csbcow 3848 . . . . . . . . . . . . . . . . . . . . . . . . 25 𝑧 / 𝑤𝑤 / 𝑥𝐵 = 𝑧 / 𝑥𝐵
195 csbconstg 3852 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (𝑧 ∈ V → 𝑧 / 𝑤𝐶 = 𝐶)
196195elv 3439 . . . . . . . . . . . . . . . . . . . . . . . . 25 𝑧 / 𝑤𝐶 = 𝐶
197194, 196ineq12i 4145 . . . . . . . . . . . . . . . . . . . . . . . 24 (𝑧 / 𝑤𝑤 / 𝑥𝐵𝑧 / 𝑤𝐶) = (𝑧 / 𝑥𝐵𝐶)
198193, 197eqtri 2767 . . . . . . . . . . . . . . . . . . . . . . 23 𝑧 / 𝑤(𝑤 / 𝑥𝐵𝐶) = (𝑧 / 𝑥𝐵𝐶)
199198eleq2i 2831 . . . . . . . . . . . . . . . . . . . . . 22 (𝑦𝑧 / 𝑤(𝑤 / 𝑥𝐵𝐶) ↔ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶))
200191, 192, 1993bitrri 298 . . . . . . . . . . . . . . . . . . . . 21 (𝑦 ∈ (𝑧 / 𝑥𝐵𝐶) ↔ [𝑧 / 𝑤]𝑦 ∈ (𝑤 / 𝑥𝐵𝐶))
201200anbi2i 623 . . . . . . . . . . . . . . . . . . . 20 ((𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) ∧ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶)) ↔ (𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) ∧ [𝑧 / 𝑤]𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)))
202201imbi1i 350 . . . . . . . . . . . . . . . . . . 19 (((𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) ∧ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶)) → 𝑤 = 𝑧) ↔ ((𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) ∧ [𝑧 / 𝑤]𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → 𝑤 = 𝑧))
2032022ralbii 3094 . . . . . . . . . . . . . . . . . 18 (∀𝑤𝐴𝑧𝐴 ((𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) ∧ 𝑦 ∈ (𝑧 / 𝑥𝐵𝐶)) → 𝑤 = 𝑧) ↔ ∀𝑤𝐴𝑧𝐴 ((𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) ∧ [𝑧 / 𝑤]𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → 𝑤 = 𝑧))
204178, 190, 2033bitri 297 . . . . . . . . . . . . . . . . 17 (∀𝑥𝐴𝑤𝐴 ((𝑦 ∈ (𝐵𝐶) ∧ [𝑤 / 𝑥]𝑦 ∈ (𝐵𝐶)) → 𝑥 = 𝑤) ↔ ∀𝑤𝐴𝑧𝐴 ((𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) ∧ [𝑧 / 𝑤]𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → 𝑤 = 𝑧))
20593, 204sylib 217 . . . . . . . . . . . . . . . 16 ((𝜑𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶)) → ∀𝑤𝐴𝑧𝐴 ((𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) ∧ [𝑧 / 𝑤]𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → 𝑤 = 𝑧))
206160, 152, 205syl2anc 584 . . . . . . . . . . . . . . 15 (((𝜑𝑤𝐴) ∧ 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → ∀𝑤𝐴𝑧𝐴 ((𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) ∧ [𝑧 / 𝑤]𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → 𝑤 = 𝑧))
207 reu2 3661 . . . . . . . . . . . . . . 15 (∃!𝑤𝐴 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) ↔ (∃𝑤𝐴 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) ∧ ∀𝑤𝐴𝑧𝐴 ((𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) ∧ [𝑧 / 𝑤]𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → 𝑤 = 𝑧)))
208159, 206, 207sylanbrc 583 . . . . . . . . . . . . . 14 (((𝜑𝑤𝐴) ∧ 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → ∃!𝑤𝐴 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶))
209 riota1 7263 . . . . . . . . . . . . . 14 (∃!𝑤𝐴 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) → ((𝑤𝐴𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) ↔ (𝑤𝐴 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) = 𝑤))
210208, 209syl 17 . . . . . . . . . . . . 13 (((𝜑𝑤𝐴) ∧ 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → ((𝑤𝐴𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) ↔ (𝑤𝐴 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) = 𝑤))
211128, 157, 210mpbi2and 709 . . . . . . . . . . . 12 (((𝜑𝑤𝐴) ∧ 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → (𝑤𝐴 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) = 𝑤)
212156, 211eqtr2id 2792 . . . . . . . . . . 11 (((𝜑𝑤𝐴) ∧ 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → 𝑤 = (𝑥𝐴 𝑦 ∈ (𝐵𝐶)))
213152, 212jca 512 . . . . . . . . . 10 (((𝜑𝑤𝐴) ∧ 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶)) → (𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶) ∧ 𝑤 = (𝑥𝐴 𝑦 ∈ (𝐵𝐶))))
214213ex 413 . . . . . . . . 9 ((𝜑𝑤𝐴) → (𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) → (𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶) ∧ 𝑤 = (𝑥𝐴 𝑦 ∈ (𝐵𝐶)))))
215125, 214sylan2 593 . . . . . . . 8 ((𝜑𝑤 ∈ {𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅}) → (𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) → (𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶) ∧ 𝑤 = (𝑥𝐴 𝑦 ∈ (𝐵𝐶)))))
216215eximdv 1921 . . . . . . 7 ((𝜑𝑤 ∈ {𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅}) → (∃𝑦 𝑦 ∈ (𝑤 / 𝑥𝐵𝐶) → ∃𝑦(𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶) ∧ 𝑤 = (𝑥𝐴 𝑦 ∈ (𝐵𝐶)))))
217124, 216mpd 15 . . . . . 6 ((𝜑𝑤 ∈ {𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅}) → ∃𝑦(𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶) ∧ 𝑤 = (𝑥𝐴 𝑦 ∈ (𝐵𝐶))))
218 df-rex 3071 . . . . . 6 (∃𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶)𝑤 = (𝑥𝐴 𝑦 ∈ (𝐵𝐶)) ↔ ∃𝑦(𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶) ∧ 𝑤 = (𝑥𝐴 𝑦 ∈ (𝐵𝐶))))
219217, 218sylibr 233 . . . . 5 ((𝜑𝑤 ∈ {𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅}) → ∃𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶)𝑤 = (𝑥𝐴 𝑦 ∈ (𝐵𝐶)))
220219ralrimiva 3104 . . . 4 (𝜑 → ∀𝑤 ∈ {𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅}∃𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶)𝑤 = (𝑥𝐴 𝑦 ∈ (𝐵𝐶)))
221 eqid 2739 . . . . 5 (𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶) ↦ (𝑥𝐴 𝑦 ∈ (𝐵𝐶))) = (𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶) ↦ (𝑥𝐴 𝑦 ∈ (𝐵𝐶)))
222221fompt 42737 . . . 4 ((𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶) ↦ (𝑥𝐴 𝑦 ∈ (𝐵𝐶))):( ran (𝑥𝐴𝐵) ∩ 𝐶)–onto→{𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅} ↔ (∀𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶)(𝑥𝐴 𝑦 ∈ (𝐵𝐶)) ∈ {𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅} ∧ ∀𝑤 ∈ {𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅}∃𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶)𝑤 = (𝑥𝐴 𝑦 ∈ (𝐵𝐶))))
223114, 220, 222sylanbrc 583 . . 3 (𝜑 → (𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶) ↦ (𝑥𝐴 𝑦 ∈ (𝐵𝐶))):( ran (𝑥𝐴𝐵) ∩ 𝐶)–onto→{𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅})
224 fodomg 10287 . . 3 (( ran (𝑥𝐴𝐵) ∩ 𝐶) ∈ V → ((𝑦 ∈ ( ran (𝑥𝐴𝐵) ∩ 𝐶) ↦ (𝑥𝐴 𝑦 ∈ (𝐵𝐶))):( ran (𝑥𝐴𝐵) ∩ 𝐶)–onto→{𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅} → {𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅} ≼ ( ran (𝑥𝐴𝐵) ∩ 𝐶)))
2256, 223, 224sylc 65 . 2 (𝜑 → {𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅} ≼ ( ran (𝑥𝐴𝐵) ∩ 𝐶))
226 domfi 8984 . 2 ((( ran (𝑥𝐴𝐵) ∩ 𝐶) ∈ Fin ∧ {𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅} ≼ ( ran (𝑥𝐴𝐵) ∩ 𝐶)) → {𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅} ∈ Fin)
2274, 225, 226syl2anc 584 1 (𝜑 → {𝑥𝐴 ∣ (𝐵𝐶) ≠ ∅} ∈ Fin)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 205  wa 396  wo 844   = wceq 1539  wex 1782  [wsb 2068  wcel 2107  wne 2944  wral 3065  wrex 3066  ∃!wreu 3067  {crab 3069  Vcvv 3433  [wsbc 3717  csb 3833  cin 3887  wss 3888  c0 4257   cuni 4840  Disj wdisj 5040   class class class wbr 5075  cmpt 5158  ran crn 5591  ontowfo 6435  crio 7240  cdom 8740  Fincfn 8742
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2155  ax-12 2172  ax-ext 2710  ax-rep 5210  ax-sep 5224  ax-nul 5231  ax-pow 5289  ax-pr 5353  ax-un 7597  ax-ac2 10228
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3or 1087  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1783  df-nf 1787  df-sb 2069  df-mo 2541  df-eu 2570  df-clab 2717  df-cleq 2731  df-clel 2817  df-nfc 2890  df-ne 2945  df-ral 3070  df-rex 3071  df-rmo 3072  df-reu 3073  df-rab 3074  df-v 3435  df-sbc 3718  df-csb 3834  df-dif 3891  df-un 3893  df-in 3895  df-ss 3905  df-pss 3907  df-nul 4258  df-if 4461  df-pw 4536  df-sn 4563  df-pr 4565  df-op 4569  df-uni 4841  df-int 4881  df-iun 4927  df-disj 5041  df-br 5076  df-opab 5138  df-mpt 5159  df-tr 5193  df-id 5490  df-eprel 5496  df-po 5504  df-so 5505  df-fr 5545  df-se 5546  df-we 5547  df-xp 5596  df-rel 5597  df-cnv 5598  df-co 5599  df-dm 5600  df-rn 5601  df-res 5602  df-ima 5603  df-pred 6206  df-ord 6273  df-on 6274  df-lim 6275  df-suc 6276  df-iota 6395  df-fun 6439  df-fn 6440  df-f 6441  df-f1 6442  df-fo 6443  df-f1o 6444  df-fv 6445  df-isom 6446  df-riota 7241  df-ov 7287  df-oprab 7288  df-mpo 7289  df-om 7722  df-1st 7840  df-2nd 7841  df-frecs 8106  df-wrecs 8137  df-recs 8211  df-1o 8306  df-er 8507  df-map 8626  df-en 8743  df-dom 8744  df-fin 8746  df-card 9706  df-acn 9709  df-ac 9881
This theorem is referenced by:  fsumiunss  43123  sge0iunmptlemre  43960
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