Metamath Proof Explorer

Theorem r1val1

Description: The value of the cumulative hierarchy of sets function expressed recursively. Theorem 7Q of Enderton p. 202. (Contributed by NM, 25-Nov-2003) (Revised by Mario Carneiro, 17-Nov-2014)

Ref Expression
Assertion r1val1 ( 𝐴 ∈ dom 𝑅1 → ( 𝑅1 ‘ 𝐴 ) = ∪ 𝑥 ∈ 𝐴 𝒫 ( 𝑅1 ‘ 𝑥 ) )

Proof

Step Hyp Ref Expression
1 simpr ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝐴 = ∅ ) → 𝐴 = ∅ )
2 1 fveq2d ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝐴 = ∅ ) → ( 𝑅1 ‘ 𝐴 ) = ( 𝑅1 ‘ ∅ ) )
3 r10 ⊢ ( 𝑅1 ‘ ∅ ) = ∅
4 2 3 syl6eq ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝐴 = ∅ ) → ( 𝑅1 ‘ 𝐴 ) = ∅ )
5 0ss ⊢ ∅ ⊆ ∪ 𝑥 ∈ 𝐴 𝒫 ( 𝑅1 ‘ 𝑥 )
6 5 a1i ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝐴 = ∅ ) → ∅ ⊆ ∪ 𝑥 ∈ 𝐴 𝒫 ( 𝑅1 ‘ 𝑥 ) )
7 4 6 eqsstrd ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝐴 = ∅ ) → ( 𝑅1 ‘ 𝐴 ) ⊆ ∪ 𝑥 ∈ 𝐴 𝒫 ( 𝑅1 ‘ 𝑥 ) )
8 nfv ⊢ Ⅎ 𝑥 𝐴 ∈ dom 𝑅1
9 nfcv ⊢ Ⅎ 𝑥 ( 𝑅1 ‘ 𝐴 )
10 nfiu1 ⊢ Ⅎ 𝑥 ∪ 𝑥 ∈ 𝐴 𝒫 ( 𝑅1 ‘ 𝑥 )
11 9 10 nfss ⊢ Ⅎ 𝑥 ( 𝑅1 ‘ 𝐴 ) ⊆ ∪ 𝑥 ∈ 𝐴 𝒫 ( 𝑅1 ‘ 𝑥 )
12 simpr ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝐴 = suc 𝑥 ) → 𝐴 = suc 𝑥 )
13 12 fveq2d ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝐴 = suc 𝑥 ) → ( 𝑅1 ‘ 𝐴 ) = ( 𝑅1 ‘ suc 𝑥 ) )
14 eleq1 ⊢ ( 𝐴 = suc 𝑥 → ( 𝐴 ∈ dom 𝑅1 ↔ suc 𝑥 ∈ dom 𝑅1 ) )
15 14 biimpac ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝐴 = suc 𝑥 ) → suc 𝑥 ∈ dom 𝑅1 )
16 r1funlim ⊢ ( Fun 𝑅1 ∧ Lim dom 𝑅1 )
17 16 simpri ⊢ Lim dom 𝑅1
18 limsuc ⊢ ( Lim dom 𝑅1 → ( 𝑥 ∈ dom 𝑅1 ↔ suc 𝑥 ∈ dom 𝑅1 ) )
19 17 18 ax-mp ⊢ ( 𝑥 ∈ dom 𝑅1 ↔ suc 𝑥 ∈ dom 𝑅1 )
20 15 19 sylibr ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝐴 = suc 𝑥 ) → 𝑥 ∈ dom 𝑅1 )
21 r1sucg ⊢ ( 𝑥 ∈ dom 𝑅1 → ( 𝑅1 ‘ suc 𝑥 ) = 𝒫 ( 𝑅1 ‘ 𝑥 ) )
22 20 21 syl ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝐴 = suc 𝑥 ) → ( 𝑅1 ‘ suc 𝑥 ) = 𝒫 ( 𝑅1 ‘ 𝑥 ) )
23 13 22 eqtrd ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝐴 = suc 𝑥 ) → ( 𝑅1 ‘ 𝐴 ) = 𝒫 ( 𝑅1 ‘ 𝑥 ) )
24 vex ⊢ 𝑥 ∈ V
25 24 sucid ⊢ 𝑥 ∈ suc 𝑥
26 25 12 eleqtrrid ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝐴 = suc 𝑥 ) → 𝑥 ∈ 𝐴 )
27 ssiun2 ⊢ ( 𝑥 ∈ 𝐴 → 𝒫 ( 𝑅1 ‘ 𝑥 ) ⊆ ∪ 𝑥 ∈ 𝐴 𝒫 ( 𝑅1 ‘ 𝑥 ) )
28 26 27 syl ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝐴 = suc 𝑥 ) → 𝒫 ( 𝑅1 ‘ 𝑥 ) ⊆ ∪ 𝑥 ∈ 𝐴 𝒫 ( 𝑅1 ‘ 𝑥 ) )
29 23 28 eqsstrd ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝐴 = suc 𝑥 ) → ( 𝑅1 ‘ 𝐴 ) ⊆ ∪ 𝑥 ∈ 𝐴 𝒫 ( 𝑅1 ‘ 𝑥 ) )
30 29 ex ⊢ ( 𝐴 ∈ dom 𝑅1 → ( 𝐴 = suc 𝑥 → ( 𝑅1 ‘ 𝐴 ) ⊆ ∪ 𝑥 ∈ 𝐴 𝒫 ( 𝑅1 ‘ 𝑥 ) ) )
31 30 a1d ⊢ ( 𝐴 ∈ dom 𝑅1 → ( 𝑥 ∈ On → ( 𝐴 = suc 𝑥 → ( 𝑅1 ‘ 𝐴 ) ⊆ ∪ 𝑥 ∈ 𝐴 𝒫 ( 𝑅1 ‘ 𝑥 ) ) ) )
32 8 11 31 rexlimd ⊢ ( 𝐴 ∈ dom 𝑅1 → ( ∃ 𝑥 ∈ On 𝐴 = suc 𝑥 → ( 𝑅1 ‘ 𝐴 ) ⊆ ∪ 𝑥 ∈ 𝐴 𝒫 ( 𝑅1 ‘ 𝑥 ) ) )
33 32 imp ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ ∃ 𝑥 ∈ On 𝐴 = suc 𝑥 ) → ( 𝑅1 ‘ 𝐴 ) ⊆ ∪ 𝑥 ∈ 𝐴 𝒫 ( 𝑅1 ‘ 𝑥 ) )
34 r1limg ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ Lim 𝐴 ) → ( 𝑅1 ‘ 𝐴 ) = ∪ 𝑥 ∈ 𝐴 ( 𝑅1 ‘ 𝑥 ) )
35 r1tr ⊢ Tr ( 𝑅1 ‘ 𝑥 )
36 dftr4 ⊢ ( Tr ( 𝑅1 ‘ 𝑥 ) ↔ ( 𝑅1 ‘ 𝑥 ) ⊆ 𝒫 ( 𝑅1 ‘ 𝑥 ) )
37 35 36 mpbi ⊢ ( 𝑅1 ‘ 𝑥 ) ⊆ 𝒫 ( 𝑅1 ‘ 𝑥 )
38 37 a1i ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ Lim 𝐴 ) → ( 𝑅1 ‘ 𝑥 ) ⊆ 𝒫 ( 𝑅1 ‘ 𝑥 ) )
39 38 ralrimivw ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ Lim 𝐴 ) → ∀ 𝑥 ∈ 𝐴 ( 𝑅1 ‘ 𝑥 ) ⊆ 𝒫 ( 𝑅1 ‘ 𝑥 ) )
40 ss2iun ⊢ ( ∀ 𝑥 ∈ 𝐴 ( 𝑅1 ‘ 𝑥 ) ⊆ 𝒫 ( 𝑅1 ‘ 𝑥 ) → ∪ 𝑥 ∈ 𝐴 ( 𝑅1 ‘ 𝑥 ) ⊆ ∪ 𝑥 ∈ 𝐴 𝒫 ( 𝑅1 ‘ 𝑥 ) )
41 39 40 syl ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ Lim 𝐴 ) → ∪ 𝑥 ∈ 𝐴 ( 𝑅1 ‘ 𝑥 ) ⊆ ∪ 𝑥 ∈ 𝐴 𝒫 ( 𝑅1 ‘ 𝑥 ) )
42 34 41 eqsstrd ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ Lim 𝐴 ) → ( 𝑅1 ‘ 𝐴 ) ⊆ ∪ 𝑥 ∈ 𝐴 𝒫 ( 𝑅1 ‘ 𝑥 ) )
43 42 adantrl ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ ( 𝐴 ∈ V ∧ Lim 𝐴 ) ) → ( 𝑅1 ‘ 𝐴 ) ⊆ ∪ 𝑥 ∈ 𝐴 𝒫 ( 𝑅1 ‘ 𝑥 ) )
44 limord ⊢ ( Lim dom 𝑅1 → Ord dom 𝑅1 )
45 17 44 ax-mp ⊢ Ord dom 𝑅1
46 ordsson ⊢ ( Ord dom 𝑅1 → dom 𝑅1 ⊆ On )
47 45 46 ax-mp ⊢ dom 𝑅1 ⊆ On
48 47 sseli ⊢ ( 𝐴 ∈ dom 𝑅1 → 𝐴 ∈ On )
49 onzsl ⊢ ( 𝐴 ∈ On ↔ ( 𝐴 = ∅ ∨ ∃ 𝑥 ∈ On 𝐴 = suc 𝑥 ∨ ( 𝐴 ∈ V ∧ Lim 𝐴 ) ) )
50 48 49 sylib ⊢ ( 𝐴 ∈ dom 𝑅1 → ( 𝐴 = ∅ ∨ ∃ 𝑥 ∈ On 𝐴 = suc 𝑥 ∨ ( 𝐴 ∈ V ∧ Lim 𝐴 ) ) )
51 7 33 43 50 mpjao3dan ⊢ ( 𝐴 ∈ dom 𝑅1 → ( 𝑅1 ‘ 𝐴 ) ⊆ ∪ 𝑥 ∈ 𝐴 𝒫 ( 𝑅1 ‘ 𝑥 ) )
52 ordtr1 ⊢ ( Ord dom 𝑅1 → ( ( 𝑥 ∈ 𝐴 ∧ 𝐴 ∈ dom 𝑅1 ) → 𝑥 ∈ dom 𝑅1 ) )
53 45 52 ax-mp ⊢ ( ( 𝑥 ∈ 𝐴 ∧ 𝐴 ∈ dom 𝑅1 ) → 𝑥 ∈ dom 𝑅1 )
54 53 ancoms ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝑥 ∈ 𝐴 ) → 𝑥 ∈ dom 𝑅1 )
55 54 21 syl ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝑥 ∈ 𝐴 ) → ( 𝑅1 ‘ suc 𝑥 ) = 𝒫 ( 𝑅1 ‘ 𝑥 ) )
56 simpr ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝑥 ∈ 𝐴 ) → 𝑥 ∈ 𝐴 )
57 ordelord ⊢ ( ( Ord dom 𝑅1 ∧ 𝐴 ∈ dom 𝑅1 ) → Ord 𝐴 )
58 45 57 mpan ⊢ ( 𝐴 ∈ dom 𝑅1 → Ord 𝐴 )
59 58 adantr ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝑥 ∈ 𝐴 ) → Ord 𝐴 )
60 ordelsuc ⊢ ( ( 𝑥 ∈ 𝐴 ∧ Ord 𝐴 ) → ( 𝑥 ∈ 𝐴 ↔ suc 𝑥 ⊆ 𝐴 ) )
61 56 59 60 syl2anc ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝑥 ∈ 𝐴 ) → ( 𝑥 ∈ 𝐴 ↔ suc 𝑥 ⊆ 𝐴 ) )
62 56 61 mpbid ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝑥 ∈ 𝐴 ) → suc 𝑥 ⊆ 𝐴 )
63 54 19 sylib ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝑥 ∈ 𝐴 ) → suc 𝑥 ∈ dom 𝑅1 )
64 simpl ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝑥 ∈ 𝐴 ) → 𝐴 ∈ dom 𝑅1 )
65 r1ord3g ⊢ ( ( suc 𝑥 ∈ dom 𝑅1 ∧ 𝐴 ∈ dom 𝑅1 ) → ( suc 𝑥 ⊆ 𝐴 → ( 𝑅1 ‘ suc 𝑥 ) ⊆ ( 𝑅1 ‘ 𝐴 ) ) )
66 63 64 65 syl2anc ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝑥 ∈ 𝐴 ) → ( suc 𝑥 ⊆ 𝐴 → ( 𝑅1 ‘ suc 𝑥 ) ⊆ ( 𝑅1 ‘ 𝐴 ) ) )
67 62 66 mpd ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝑥 ∈ 𝐴 ) → ( 𝑅1 ‘ suc 𝑥 ) ⊆ ( 𝑅1 ‘ 𝐴 ) )
68 55 67 eqsstrrd ⊢ ( ( 𝐴 ∈ dom 𝑅1 ∧ 𝑥 ∈ 𝐴 ) → 𝒫 ( 𝑅1 ‘ 𝑥 ) ⊆ ( 𝑅1 ‘ 𝐴 ) )
69 68 ralrimiva ⊢ ( 𝐴 ∈ dom 𝑅1 → ∀ 𝑥 ∈ 𝐴 𝒫 ( 𝑅1 ‘ 𝑥 ) ⊆ ( 𝑅1 ‘ 𝐴 ) )
70 iunss ⊢ ( ∪ 𝑥 ∈ 𝐴 𝒫 ( 𝑅1 ‘ 𝑥 ) ⊆ ( 𝑅1 ‘ 𝐴 ) ↔ ∀ 𝑥 ∈ 𝐴 𝒫 ( 𝑅1 ‘ 𝑥 ) ⊆ ( 𝑅1 ‘ 𝐴 ) )
71 69 70 sylibr ⊢ ( 𝐴 ∈ dom 𝑅1 → ∪ 𝑥 ∈ 𝐴 𝒫 ( 𝑅1 ‘ 𝑥 ) ⊆ ( 𝑅1 ‘ 𝐴 ) )
72 51 71 eqssd ⊢ ( 𝐴 ∈ dom 𝑅1 → ( 𝑅1 ‘ 𝐴 ) = ∪ 𝑥 ∈ 𝐴 𝒫 ( 𝑅1 ‘ 𝑥 ) )