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Theorem ldsysgenld 32028
Description: The intersection of all lambda-systems containing a given collection of sets 𝐴, which is called the lambda-system generated by 𝐴, is itself also a lambda-system. (Contributed by Thierry Arnoux, 16-Jun-2020.)
Hypotheses
Ref Expression
isldsys.l 𝐿 = {𝑠 ∈ 𝒫 𝒫 𝑂 ∣ (∅ ∈ 𝑠 ∧ ∀𝑥𝑠 (𝑂𝑥) ∈ 𝑠 ∧ ∀𝑥 ∈ 𝒫 𝑠((𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦) → 𝑥𝑠))}
ldsysgenld.1 (𝜑𝑂𝑉)
ldsysgenld.2 (𝜑𝐴 ⊆ 𝒫 𝑂)
Assertion
Ref Expression
ldsysgenld (𝜑 {𝑡𝐿𝐴𝑡} ∈ 𝐿)
Distinct variable groups:   𝑦,𝑠   𝑡,𝐿   𝑂,𝑠,𝑡,𝑥   𝑥,𝑉   𝑦,𝑡   𝐴,𝑠,𝑡,𝑥   𝐿,𝑠,𝑥   𝜑,𝑡,𝑥
Allowed substitution hints:   𝜑(𝑦,𝑠)   𝐴(𝑦)   𝐿(𝑦)   𝑂(𝑦)   𝑉(𝑦,𝑡,𝑠)

Proof of Theorem ldsysgenld
Dummy variable 𝑢 is distinct from all other variables.
StepHypRef Expression
1 ldsysgenld.1 . . . . 5 (𝜑𝑂𝑉)
2 pwsiga 31998 . . . . 5 (𝑂𝑉 → 𝒫 𝑂 ∈ (sigAlgebra‘𝑂))
31, 2syl 17 . . . 4 (𝜑 → 𝒫 𝑂 ∈ (sigAlgebra‘𝑂))
4 isldsys.l . . . . . . . 8 𝐿 = {𝑠 ∈ 𝒫 𝒫 𝑂 ∣ (∅ ∈ 𝑠 ∧ ∀𝑥𝑠 (𝑂𝑥) ∈ 𝑠 ∧ ∀𝑥 ∈ 𝒫 𝑠((𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦) → 𝑥𝑠))}
54sigaldsys 32027 . . . . . . 7 (sigAlgebra‘𝑂) ⊆ 𝐿
65, 3sselid 3915 . . . . . 6 (𝜑 → 𝒫 𝑂𝐿)
7 ldsysgenld.2 . . . . . 6 (𝜑𝐴 ⊆ 𝒫 𝑂)
8 sseq2 3943 . . . . . . 7 (𝑡 = 𝒫 𝑂 → (𝐴𝑡𝐴 ⊆ 𝒫 𝑂))
98elrab 3617 . . . . . 6 (𝒫 𝑂 ∈ {𝑡𝐿𝐴𝑡} ↔ (𝒫 𝑂𝐿𝐴 ⊆ 𝒫 𝑂))
106, 7, 9sylanbrc 582 . . . . 5 (𝜑 → 𝒫 𝑂 ∈ {𝑡𝐿𝐴𝑡})
11 intss1 4891 . . . . 5 (𝒫 𝑂 ∈ {𝑡𝐿𝐴𝑡} → {𝑡𝐿𝐴𝑡} ⊆ 𝒫 𝑂)
1210, 11syl 17 . . . 4 (𝜑 {𝑡𝐿𝐴𝑡} ⊆ 𝒫 𝑂)
133, 12sselpwd 5245 . . 3 (𝜑 {𝑡𝐿𝐴𝑡} ∈ 𝒫 𝒫 𝑂)
144isldsys 32024 . . . . . . . . . 10 (𝑡𝐿 ↔ (𝑡 ∈ 𝒫 𝒫 𝑂 ∧ (∅ ∈ 𝑡 ∧ ∀𝑥𝑡 (𝑂𝑥) ∈ 𝑡 ∧ ∀𝑥 ∈ 𝒫 𝑡((𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦) → 𝑥𝑡))))
1514simprbi 496 . . . . . . . . 9 (𝑡𝐿 → (∅ ∈ 𝑡 ∧ ∀𝑥𝑡 (𝑂𝑥) ∈ 𝑡 ∧ ∀𝑥 ∈ 𝒫 𝑡((𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦) → 𝑥𝑡)))
1615simp1d 1140 . . . . . . . 8 (𝑡𝐿 → ∅ ∈ 𝑡)
1716adantl 481 . . . . . . 7 ((𝜑𝑡𝐿) → ∅ ∈ 𝑡)
1817a1d 25 . . . . . 6 ((𝜑𝑡𝐿) → (𝐴𝑡 → ∅ ∈ 𝑡))
1918ralrimiva 3107 . . . . 5 (𝜑 → ∀𝑡𝐿 (𝐴𝑡 → ∅ ∈ 𝑡))
20 0ex 5226 . . . . . 6 ∅ ∈ V
2120elintrab 4888 . . . . 5 (∅ ∈ {𝑡𝐿𝐴𝑡} ↔ ∀𝑡𝐿 (𝐴𝑡 → ∅ ∈ 𝑡))
2219, 21sylibr 233 . . . 4 (𝜑 → ∅ ∈ {𝑡𝐿𝐴𝑡})
23 nfv 1918 . . . . . . . 8 𝑡𝜑
24 nfcv 2906 . . . . . . . . 9 𝑡𝑥
25 nfrab1 3310 . . . . . . . . . 10 𝑡{𝑡𝐿𝐴𝑡}
2625nfint 4886 . . . . . . . . 9 𝑡 {𝑡𝐿𝐴𝑡}
2724, 26nfel 2920 . . . . . . . 8 𝑡 𝑥 {𝑡𝐿𝐴𝑡}
2823, 27nfan 1903 . . . . . . 7 𝑡(𝜑𝑥 {𝑡𝐿𝐴𝑡})
29 simplr 765 . . . . . . . . . 10 ((((𝜑𝑥 {𝑡𝐿𝐴𝑡}) ∧ 𝑡𝐿) ∧ 𝐴𝑡) → 𝑡𝐿)
30 vex 3426 . . . . . . . . . . . . . . 15 𝑥 ∈ V
3130elintrab 4888 . . . . . . . . . . . . . 14 (𝑥 {𝑡𝐿𝐴𝑡} ↔ ∀𝑡𝐿 (𝐴𝑡𝑥𝑡))
3231biimpi 215 . . . . . . . . . . . . 13 (𝑥 {𝑡𝐿𝐴𝑡} → ∀𝑡𝐿 (𝐴𝑡𝑥𝑡))
3332adantl 481 . . . . . . . . . . . 12 ((𝜑𝑥 {𝑡𝐿𝐴𝑡}) → ∀𝑡𝐿 (𝐴𝑡𝑥𝑡))
3433r19.21bi 3132 . . . . . . . . . . 11 (((𝜑𝑥 {𝑡𝐿𝐴𝑡}) ∧ 𝑡𝐿) → (𝐴𝑡𝑥𝑡))
3534imp 406 . . . . . . . . . 10 ((((𝜑𝑥 {𝑡𝐿𝐴𝑡}) ∧ 𝑡𝐿) ∧ 𝐴𝑡) → 𝑥𝑡)
3615simp2d 1141 . . . . . . . . . . 11 (𝑡𝐿 → ∀𝑥𝑡 (𝑂𝑥) ∈ 𝑡)
3736r19.21bi 3132 . . . . . . . . . 10 ((𝑡𝐿𝑥𝑡) → (𝑂𝑥) ∈ 𝑡)
3829, 35, 37syl2anc 583 . . . . . . . . 9 ((((𝜑𝑥 {𝑡𝐿𝐴𝑡}) ∧ 𝑡𝐿) ∧ 𝐴𝑡) → (𝑂𝑥) ∈ 𝑡)
3938ex 412 . . . . . . . 8 (((𝜑𝑥 {𝑡𝐿𝐴𝑡}) ∧ 𝑡𝐿) → (𝐴𝑡 → (𝑂𝑥) ∈ 𝑡))
4039ex 412 . . . . . . 7 ((𝜑𝑥 {𝑡𝐿𝐴𝑡}) → (𝑡𝐿 → (𝐴𝑡 → (𝑂𝑥) ∈ 𝑡)))
4128, 40ralrimi 3139 . . . . . 6 ((𝜑𝑥 {𝑡𝐿𝐴𝑡}) → ∀𝑡𝐿 (𝐴𝑡 → (𝑂𝑥) ∈ 𝑡))
42 difexg 5246 . . . . . . . 8 (𝑂𝑉 → (𝑂𝑥) ∈ V)
43 elintrabg 4889 . . . . . . . 8 ((𝑂𝑥) ∈ V → ((𝑂𝑥) ∈ {𝑡𝐿𝐴𝑡} ↔ ∀𝑡𝐿 (𝐴𝑡 → (𝑂𝑥) ∈ 𝑡)))
441, 42, 433syl 18 . . . . . . 7 (𝜑 → ((𝑂𝑥) ∈ {𝑡𝐿𝐴𝑡} ↔ ∀𝑡𝐿 (𝐴𝑡 → (𝑂𝑥) ∈ 𝑡)))
4544adantr 480 . . . . . 6 ((𝜑𝑥 {𝑡𝐿𝐴𝑡}) → ((𝑂𝑥) ∈ {𝑡𝐿𝐴𝑡} ↔ ∀𝑡𝐿 (𝐴𝑡 → (𝑂𝑥) ∈ 𝑡)))
4641, 45mpbird 256 . . . . 5 ((𝜑𝑥 {𝑡𝐿𝐴𝑡}) → (𝑂𝑥) ∈ {𝑡𝐿𝐴𝑡})
4746ralrimiva 3107 . . . 4 (𝜑 → ∀𝑥 {𝑡𝐿𝐴𝑡} (𝑂𝑥) ∈ {𝑡𝐿𝐴𝑡})
4826nfpw 4551 . . . . . . . . . . 11 𝑡𝒫 {𝑡𝐿𝐴𝑡}
4924, 48nfel 2920 . . . . . . . . . 10 𝑡 𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡}
5023, 49nfan 1903 . . . . . . . . 9 𝑡(𝜑𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡})
51 nfv 1918 . . . . . . . . 9 𝑡(𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦)
5250, 51nfan 1903 . . . . . . . 8 𝑡((𝜑𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡}) ∧ (𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦))
53 simplr 765 . . . . . . . . . . 11 (((((𝜑𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡}) ∧ (𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦)) ∧ 𝑡𝐿) ∧ 𝐴𝑡) → 𝑡𝐿)
54 simpr 484 . . . . . . . . . . . . . . . 16 ((((((𝜑𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡}) ∧ (𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦)) ∧ 𝑡𝐿) ∧ 𝐴𝑡) ∧ 𝑢 {𝑡𝐿𝐴𝑡}) → 𝑢 {𝑡𝐿𝐴𝑡})
55 simpllr 772 . . . . . . . . . . . . . . . 16 ((((((𝜑𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡}) ∧ (𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦)) ∧ 𝑡𝐿) ∧ 𝐴𝑡) ∧ 𝑢 {𝑡𝐿𝐴𝑡}) → 𝑡𝐿)
56 simplr 765 . . . . . . . . . . . . . . . 16 ((((((𝜑𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡}) ∧ (𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦)) ∧ 𝑡𝐿) ∧ 𝐴𝑡) ∧ 𝑢 {𝑡𝐿𝐴𝑡}) → 𝐴𝑡)
57 vex 3426 . . . . . . . . . . . . . . . . . . . 20 𝑢 ∈ V
5857elintrab 4888 . . . . . . . . . . . . . . . . . . 19 (𝑢 {𝑡𝐿𝐴𝑡} ↔ ∀𝑡𝐿 (𝐴𝑡𝑢𝑡))
5958biimpi 215 . . . . . . . . . . . . . . . . . 18 (𝑢 {𝑡𝐿𝐴𝑡} → ∀𝑡𝐿 (𝐴𝑡𝑢𝑡))
6059r19.21bi 3132 . . . . . . . . . . . . . . . . 17 ((𝑢 {𝑡𝐿𝐴𝑡} ∧ 𝑡𝐿) → (𝐴𝑡𝑢𝑡))
6160imp 406 . . . . . . . . . . . . . . . 16 (((𝑢 {𝑡𝐿𝐴𝑡} ∧ 𝑡𝐿) ∧ 𝐴𝑡) → 𝑢𝑡)
6254, 55, 56, 61syl21anc 834 . . . . . . . . . . . . . . 15 ((((((𝜑𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡}) ∧ (𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦)) ∧ 𝑡𝐿) ∧ 𝐴𝑡) ∧ 𝑢 {𝑡𝐿𝐴𝑡}) → 𝑢𝑡)
6362ex 412 . . . . . . . . . . . . . 14 (((((𝜑𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡}) ∧ (𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦)) ∧ 𝑡𝐿) ∧ 𝐴𝑡) → (𝑢 {𝑡𝐿𝐴𝑡} → 𝑢𝑡))
6463ssrdv 3923 . . . . . . . . . . . . 13 (((((𝜑𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡}) ∧ (𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦)) ∧ 𝑡𝐿) ∧ 𝐴𝑡) → {𝑡𝐿𝐴𝑡} ⊆ 𝑡)
6564sspwd 4545 . . . . . . . . . . . 12 (((((𝜑𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡}) ∧ (𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦)) ∧ 𝑡𝐿) ∧ 𝐴𝑡) → 𝒫 {𝑡𝐿𝐴𝑡} ⊆ 𝒫 𝑡)
66 simp-4r 780 . . . . . . . . . . . 12 (((((𝜑𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡}) ∧ (𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦)) ∧ 𝑡𝐿) ∧ 𝐴𝑡) → 𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡})
6765, 66sseldd 3918 . . . . . . . . . . 11 (((((𝜑𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡}) ∧ (𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦)) ∧ 𝑡𝐿) ∧ 𝐴𝑡) → 𝑥 ∈ 𝒫 𝑡)
68 simpllr 772 . . . . . . . . . . 11 (((((𝜑𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡}) ∧ (𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦)) ∧ 𝑡𝐿) ∧ 𝐴𝑡) → (𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦))
6915simp3d 1142 . . . . . . . . . . . . 13 (𝑡𝐿 → ∀𝑥 ∈ 𝒫 𝑡((𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦) → 𝑥𝑡))
7069r19.21bi 3132 . . . . . . . . . . . 12 ((𝑡𝐿𝑥 ∈ 𝒫 𝑡) → ((𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦) → 𝑥𝑡))
7170imp 406 . . . . . . . . . . 11 (((𝑡𝐿𝑥 ∈ 𝒫 𝑡) ∧ (𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦)) → 𝑥𝑡)
7253, 67, 68, 71syl21anc 834 . . . . . . . . . 10 (((((𝜑𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡}) ∧ (𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦)) ∧ 𝑡𝐿) ∧ 𝐴𝑡) → 𝑥𝑡)
7372ex 412 . . . . . . . . 9 ((((𝜑𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡}) ∧ (𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦)) ∧ 𝑡𝐿) → (𝐴𝑡 𝑥𝑡))
7473ex 412 . . . . . . . 8 (((𝜑𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡}) ∧ (𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦)) → (𝑡𝐿 → (𝐴𝑡 𝑥𝑡)))
7552, 74ralrimi 3139 . . . . . . 7 (((𝜑𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡}) ∧ (𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦)) → ∀𝑡𝐿 (𝐴𝑡 𝑥𝑡))
76 vuniex 7570 . . . . . . . 8 𝑥 ∈ V
7776elintrab 4888 . . . . . . 7 ( 𝑥 {𝑡𝐿𝐴𝑡} ↔ ∀𝑡𝐿 (𝐴𝑡 𝑥𝑡))
7875, 77sylibr 233 . . . . . 6 (((𝜑𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡}) ∧ (𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦)) → 𝑥 {𝑡𝐿𝐴𝑡})
7978ex 412 . . . . 5 ((𝜑𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡}) → ((𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦) → 𝑥 {𝑡𝐿𝐴𝑡}))
8079ralrimiva 3107 . . . 4 (𝜑 → ∀𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡} ((𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦) → 𝑥 {𝑡𝐿𝐴𝑡}))
8122, 47, 803jca 1126 . . 3 (𝜑 → (∅ ∈ {𝑡𝐿𝐴𝑡} ∧ ∀𝑥 {𝑡𝐿𝐴𝑡} (𝑂𝑥) ∈ {𝑡𝐿𝐴𝑡} ∧ ∀𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡} ((𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦) → 𝑥 {𝑡𝐿𝐴𝑡})))
8213, 81jca 511 . 2 (𝜑 → ( {𝑡𝐿𝐴𝑡} ∈ 𝒫 𝒫 𝑂 ∧ (∅ ∈ {𝑡𝐿𝐴𝑡} ∧ ∀𝑥 {𝑡𝐿𝐴𝑡} (𝑂𝑥) ∈ {𝑡𝐿𝐴𝑡} ∧ ∀𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡} ((𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦) → 𝑥 {𝑡𝐿𝐴𝑡}))))
834isldsys 32024 . 2 ( {𝑡𝐿𝐴𝑡} ∈ 𝐿 ↔ ( {𝑡𝐿𝐴𝑡} ∈ 𝒫 𝒫 𝑂 ∧ (∅ ∈ {𝑡𝐿𝐴𝑡} ∧ ∀𝑥 {𝑡𝐿𝐴𝑡} (𝑂𝑥) ∈ {𝑡𝐿𝐴𝑡} ∧ ∀𝑥 ∈ 𝒫 {𝑡𝐿𝐴𝑡} ((𝑥 ≼ ω ∧ Disj 𝑦𝑥 𝑦) → 𝑥 {𝑡𝐿𝐴𝑡}))))
8482, 83sylibr 233 1 (𝜑 {𝑡𝐿𝐴𝑡} ∈ 𝐿)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wa 395  w3a 1085   = wceq 1539  wcel 2108  wral 3063  {crab 3067  Vcvv 3422  cdif 3880  wss 3883  c0 4253  𝒫 cpw 4530   cuni 4836   cint 4876  Disj wdisj 5035   class class class wbr 5070  cfv 6418  ωcom 7687  cdom 8689  sigAlgebracsiga 31976
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-rep 5205  ax-sep 5218  ax-nul 5225  ax-pow 5283  ax-pr 5347  ax-un 7566  ax-inf2 9329  ax-ac2 10150
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3or 1086  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-rmo 3071  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-pss 3902  df-nul 4254  df-if 4457  df-pw 4532  df-sn 4559  df-pr 4561  df-tp 4563  df-op 4565  df-uni 4837  df-int 4877  df-iun 4923  df-iin 4924  df-br 5071  df-opab 5133  df-mpt 5154  df-tr 5188  df-id 5480  df-eprel 5486  df-po 5494  df-so 5495  df-fr 5535  df-se 5536  df-we 5537  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-pred 6191  df-ord 6254  df-on 6255  df-lim 6256  df-suc 6257  df-iota 6376  df-fun 6420  df-fn 6421  df-f 6422  df-f1 6423  df-fo 6424  df-f1o 6425  df-fv 6426  df-isom 6427  df-riota 7212  df-ov 7258  df-oprab 7259  df-mpo 7260  df-om 7688  df-1st 7804  df-2nd 7805  df-frecs 8068  df-wrecs 8099  df-recs 8173  df-rdg 8212  df-1o 8267  df-2o 8268  df-er 8456  df-map 8575  df-en 8692  df-dom 8693  df-sdom 8694  df-fin 8695  df-oi 9199  df-dju 9590  df-card 9628  df-acn 9631  df-ac 9803  df-siga 31977
This theorem is referenced by:  ldgenpisys  32034  dynkin  32035
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