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Theorem rdgssun 35204
Description: In a recursive definition where each step expands on the previous one using a union, every previous step is a subset of every later step. (Contributed by ML, 1-Apr-2022.)
Hypotheses
Ref Expression
rdgssun.1 𝐹 = (𝑤 ∈ V ↦ (𝑤𝐵))
rdgssun.2 𝐵 ∈ V
Assertion
Ref Expression
rdgssun ((𝑋 ∈ On ∧ 𝑌𝑋) → (rec(𝐹, 𝐴)‘𝑌) ⊆ (rec(𝐹, 𝐴)‘𝑋))
Distinct variable groups:   𝑤,𝐴   𝑤,𝑌
Allowed substitution hints:   𝐵(𝑤)   𝐹(𝑤)   𝑋(𝑤)

Proof of Theorem rdgssun
Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 nfsbc1v 3705 . . . . . . . . . . . 12 𝑥[∅ / 𝑥]𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥)
2 0ex 5185 . . . . . . . . . . . 12 ∅ ∈ V
3 rzal 4405 . . . . . . . . . . . . 13 (𝑥 = ∅ → ∀𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥))
4 sbceq1a 3696 . . . . . . . . . . . . 13 (𝑥 = ∅ → (∀𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥) ↔ [∅ / 𝑥]𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥)))
53, 4mpbid 235 . . . . . . . . . . . 12 (𝑥 = ∅ → [∅ / 𝑥]𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥))
61, 2, 5vtoclef 3491 . . . . . . . . . . 11 [∅ / 𝑥]𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥)
7 vex 3404 . . . . . . . . . . . . . . . 16 𝑦 ∈ V
87elsuc 6251 . . . . . . . . . . . . . . 15 (𝑦 ∈ suc 𝑥 ↔ (𝑦𝑥𝑦 = 𝑥))
9 ssun1 4072 . . . . . . . . . . . . . . . . . . . 20 (rec(𝐹, 𝐴)‘𝑥) ⊆ ((rec(𝐹, 𝐴)‘𝑥) ∪ (rec(𝐹, 𝐴)‘𝑥) / 𝑤𝐵)
10 fvex 6699 . . . . . . . . . . . . . . . . . . . . . 22 (rec(𝐹, 𝐴)‘𝑥) ∈ V
11 rdgssun.2 . . . . . . . . . . . . . . . . . . . . . . 23 𝐵 ∈ V
1211csbex 5189 . . . . . . . . . . . . . . . . . . . . . 22 (rec(𝐹, 𝐴)‘𝑥) / 𝑤𝐵 ∈ V
1310, 12unex 7499 . . . . . . . . . . . . . . . . . . . . 21 ((rec(𝐹, 𝐴)‘𝑥) ∪ (rec(𝐹, 𝐴)‘𝑥) / 𝑤𝐵) ∈ V
14 nfcv 2900 . . . . . . . . . . . . . . . . . . . . . 22 𝑤𝐴
15 nfcv 2900 . . . . . . . . . . . . . . . . . . . . . 22 𝑤𝑥
16 rdgssun.1 . . . . . . . . . . . . . . . . . . . . . . . . . 26 𝐹 = (𝑤 ∈ V ↦ (𝑤𝐵))
17 nfmpt1 5138 . . . . . . . . . . . . . . . . . . . . . . . . . 26 𝑤(𝑤 ∈ V ↦ (𝑤𝐵))
1816, 17nfcxfr 2898 . . . . . . . . . . . . . . . . . . . . . . . . 25 𝑤𝐹
1918, 14nfrdg 8091 . . . . . . . . . . . . . . . . . . . . . . . 24 𝑤rec(𝐹, 𝐴)
2019, 15nffv 6696 . . . . . . . . . . . . . . . . . . . . . . 23 𝑤(rec(𝐹, 𝐴)‘𝑥)
2120nfcsb1 3823 . . . . . . . . . . . . . . . . . . . . . . 23 𝑤(rec(𝐹, 𝐴)‘𝑥) / 𝑤𝐵
2220, 21nfun 4065 . . . . . . . . . . . . . . . . . . . . . 22 𝑤((rec(𝐹, 𝐴)‘𝑥) ∪ (rec(𝐹, 𝐴)‘𝑥) / 𝑤𝐵)
23 rdgeq1 8088 . . . . . . . . . . . . . . . . . . . . . . 23 (𝐹 = (𝑤 ∈ V ↦ (𝑤𝐵)) → rec(𝐹, 𝐴) = rec((𝑤 ∈ V ↦ (𝑤𝐵)), 𝐴))
2416, 23ax-mp 5 . . . . . . . . . . . . . . . . . . . . . 22 rec(𝐹, 𝐴) = rec((𝑤 ∈ V ↦ (𝑤𝐵)), 𝐴)
25 id 22 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑤 = (rec(𝐹, 𝐴)‘𝑥) → 𝑤 = (rec(𝐹, 𝐴)‘𝑥))
26 csbeq1a 3814 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑤 = (rec(𝐹, 𝐴)‘𝑥) → 𝐵 = (rec(𝐹, 𝐴)‘𝑥) / 𝑤𝐵)
2725, 26uneq12d 4064 . . . . . . . . . . . . . . . . . . . . . 22 (𝑤 = (rec(𝐹, 𝐴)‘𝑥) → (𝑤𝐵) = ((rec(𝐹, 𝐴)‘𝑥) ∪ (rec(𝐹, 𝐴)‘𝑥) / 𝑤𝐵))
2814, 15, 22, 24, 27rdgsucmptf 8105 . . . . . . . . . . . . . . . . . . . . 21 ((𝑥 ∈ On ∧ ((rec(𝐹, 𝐴)‘𝑥) ∪ (rec(𝐹, 𝐴)‘𝑥) / 𝑤𝐵) ∈ V) → (rec(𝐹, 𝐴)‘suc 𝑥) = ((rec(𝐹, 𝐴)‘𝑥) ∪ (rec(𝐹, 𝐴)‘𝑥) / 𝑤𝐵))
2913, 28mpan2 691 . . . . . . . . . . . . . . . . . . . 20 (𝑥 ∈ On → (rec(𝐹, 𝐴)‘suc 𝑥) = ((rec(𝐹, 𝐴)‘𝑥) ∪ (rec(𝐹, 𝐴)‘𝑥) / 𝑤𝐵))
309, 29sseqtrrid 3940 . . . . . . . . . . . . . . . . . . 19 (𝑥 ∈ On → (rec(𝐹, 𝐴)‘𝑥) ⊆ (rec(𝐹, 𝐴)‘suc 𝑥))
31 sstr2 3894 . . . . . . . . . . . . . . . . . . 19 ((rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥) → ((rec(𝐹, 𝐴)‘𝑥) ⊆ (rec(𝐹, 𝐴)‘suc 𝑥) → (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘suc 𝑥)))
3230, 31syl5com 31 . . . . . . . . . . . . . . . . . 18 (𝑥 ∈ On → ((rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥) → (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘suc 𝑥)))
3332imim2d 57 . . . . . . . . . . . . . . . . 17 (𝑥 ∈ On → ((𝑦𝑥 → (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥)) → (𝑦𝑥 → (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘suc 𝑥))))
3433imp 410 . . . . . . . . . . . . . . . 16 ((𝑥 ∈ On ∧ (𝑦𝑥 → (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥))) → (𝑦𝑥 → (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘suc 𝑥)))
35 fveq2 6686 . . . . . . . . . . . . . . . . . . 19 (𝑦 = 𝑥 → (rec(𝐹, 𝐴)‘𝑦) = (rec(𝐹, 𝐴)‘𝑥))
3635sseq1d 3918 . . . . . . . . . . . . . . . . . 18 (𝑦 = 𝑥 → ((rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘suc 𝑥) ↔ (rec(𝐹, 𝐴)‘𝑥) ⊆ (rec(𝐹, 𝐴)‘suc 𝑥)))
3730, 36syl5ibrcom 250 . . . . . . . . . . . . . . . . 17 (𝑥 ∈ On → (𝑦 = 𝑥 → (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘suc 𝑥)))
3837adantr 484 . . . . . . . . . . . . . . . 16 ((𝑥 ∈ On ∧ (𝑦𝑥 → (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥))) → (𝑦 = 𝑥 → (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘suc 𝑥)))
3934, 38jaod 858 . . . . . . . . . . . . . . 15 ((𝑥 ∈ On ∧ (𝑦𝑥 → (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥))) → ((𝑦𝑥𝑦 = 𝑥) → (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘suc 𝑥)))
408, 39syl5bi 245 . . . . . . . . . . . . . 14 ((𝑥 ∈ On ∧ (𝑦𝑥 → (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥))) → (𝑦 ∈ suc 𝑥 → (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘suc 𝑥)))
4140ex 416 . . . . . . . . . . . . 13 (𝑥 ∈ On → ((𝑦𝑥 → (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥)) → (𝑦 ∈ suc 𝑥 → (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘suc 𝑥))))
4241ralimdv2 3091 . . . . . . . . . . . 12 (𝑥 ∈ On → (∀𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥) → ∀𝑦 ∈ suc 𝑥(rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘suc 𝑥)))
43 df-sbc 3686 . . . . . . . . . . . . 13 ([suc 𝑥 / 𝑥]𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥) ↔ suc 𝑥 ∈ {𝑥 ∣ ∀𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥)})
44 vex 3404 . . . . . . . . . . . . . . 15 𝑥 ∈ V
4544sucex 7557 . . . . . . . . . . . . . 14 suc 𝑥 ∈ V
46 fveq2 6686 . . . . . . . . . . . . . . . 16 (𝑧 = suc 𝑥 → (rec(𝐹, 𝐴)‘𝑧) = (rec(𝐹, 𝐴)‘suc 𝑥))
4746sseq2d 3919 . . . . . . . . . . . . . . 15 (𝑧 = suc 𝑥 → ((rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑧) ↔ (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘suc 𝑥)))
4847raleqbi1dv 3309 . . . . . . . . . . . . . 14 (𝑧 = suc 𝑥 → (∀𝑦𝑧 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑧) ↔ ∀𝑦 ∈ suc 𝑥(rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘suc 𝑥)))
49 fveq2 6686 . . . . . . . . . . . . . . . . 17 (𝑥 = 𝑧 → (rec(𝐹, 𝐴)‘𝑥) = (rec(𝐹, 𝐴)‘𝑧))
5049sseq2d 3919 . . . . . . . . . . . . . . . 16 (𝑥 = 𝑧 → ((rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥) ↔ (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑧)))
5150raleqbi1dv 3309 . . . . . . . . . . . . . . 15 (𝑥 = 𝑧 → (∀𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥) ↔ ∀𝑦𝑧 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑧)))
5251cbvabv 2807 . . . . . . . . . . . . . 14 {𝑥 ∣ ∀𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥)} = {𝑧 ∣ ∀𝑦𝑧 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑧)}
5345, 48, 52elab2 3582 . . . . . . . . . . . . 13 (suc 𝑥 ∈ {𝑥 ∣ ∀𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥)} ↔ ∀𝑦 ∈ suc 𝑥(rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘suc 𝑥))
5443, 53bitri 278 . . . . . . . . . . . 12 ([suc 𝑥 / 𝑥]𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥) ↔ ∀𝑦 ∈ suc 𝑥(rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘suc 𝑥))
5542, 54syl6ibr 255 . . . . . . . . . . 11 (𝑥 ∈ On → (∀𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥) → [suc 𝑥 / 𝑥]𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥)))
56 ssiun2 4943 . . . . . . . . . . . . . . . 16 (𝑦𝑧 → (rec(𝐹, 𝐴)‘𝑦) ⊆ 𝑦𝑧 (rec(𝐹, 𝐴)‘𝑦))
5756adantl 485 . . . . . . . . . . . . . . 15 ((Lim 𝑧𝑦𝑧) → (rec(𝐹, 𝐴)‘𝑦) ⊆ 𝑦𝑧 (rec(𝐹, 𝐴)‘𝑦))
58 vex 3404 . . . . . . . . . . . . . . . . 17 𝑧 ∈ V
59 rdglim2a 8110 . . . . . . . . . . . . . . . . 17 ((𝑧 ∈ V ∧ Lim 𝑧) → (rec(𝐹, 𝐴)‘𝑧) = 𝑦𝑧 (rec(𝐹, 𝐴)‘𝑦))
6058, 59mpan 690 . . . . . . . . . . . . . . . 16 (Lim 𝑧 → (rec(𝐹, 𝐴)‘𝑧) = 𝑦𝑧 (rec(𝐹, 𝐴)‘𝑦))
6160adantr 484 . . . . . . . . . . . . . . 15 ((Lim 𝑧𝑦𝑧) → (rec(𝐹, 𝐴)‘𝑧) = 𝑦𝑧 (rec(𝐹, 𝐴)‘𝑦))
6257, 61sseqtrrd 3928 . . . . . . . . . . . . . 14 ((Lim 𝑧𝑦𝑧) → (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑧))
6362ralrimiva 3097 . . . . . . . . . . . . 13 (Lim 𝑧 → ∀𝑦𝑧 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑧))
64 df-sbc 3686 . . . . . . . . . . . . . . 15 ([𝑧 / 𝑥]𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥) ↔ 𝑧 ∈ {𝑥 ∣ ∀𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥)})
6552eleq2i 2825 . . . . . . . . . . . . . . 15 (𝑧 ∈ {𝑥 ∣ ∀𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥)} ↔ 𝑧 ∈ {𝑧 ∣ ∀𝑦𝑧 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑧)})
6664, 65bitri 278 . . . . . . . . . . . . . 14 ([𝑧 / 𝑥]𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥) ↔ 𝑧 ∈ {𝑧 ∣ ∀𝑦𝑧 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑧)})
67 abid 2721 . . . . . . . . . . . . . 14 (𝑧 ∈ {𝑧 ∣ ∀𝑦𝑧 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑧)} ↔ ∀𝑦𝑧 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑧))
6866, 67bitri 278 . . . . . . . . . . . . 13 ([𝑧 / 𝑥]𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥) ↔ ∀𝑦𝑧 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑧))
6963, 68sylibr 237 . . . . . . . . . . . 12 (Lim 𝑧[𝑧 / 𝑥]𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥))
7069a1d 25 . . . . . . . . . . 11 (Lim 𝑧 → (∀𝑥𝑧𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥) → [𝑧 / 𝑥]𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥)))
716, 55, 70tfindes 7608 . . . . . . . . . 10 (𝑥 ∈ On → ∀𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥))
72 rsp 3119 . . . . . . . . . 10 (∀𝑦𝑥 (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥) → (𝑦𝑥 → (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥)))
7371, 72syl 17 . . . . . . . . 9 (𝑥 ∈ On → (𝑦𝑥 → (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥)))
74 eleq1 2821 . . . . . . . . . . 11 (𝑥 = 𝑋 → (𝑥 ∈ On ↔ 𝑋 ∈ On))
7574adantl 485 . . . . . . . . . 10 ((𝑦 = 𝑌𝑥 = 𝑋) → (𝑥 ∈ On ↔ 𝑋 ∈ On))
76 eleq12 2823 . . . . . . . . . . 11 ((𝑦 = 𝑌𝑥 = 𝑋) → (𝑦𝑥𝑌𝑋))
77 fveq2 6686 . . . . . . . . . . . . 13 (𝑦 = 𝑌 → (rec(𝐹, 𝐴)‘𝑦) = (rec(𝐹, 𝐴)‘𝑌))
7877adantr 484 . . . . . . . . . . . 12 ((𝑦 = 𝑌𝑥 = 𝑋) → (rec(𝐹, 𝐴)‘𝑦) = (rec(𝐹, 𝐴)‘𝑌))
79 fveq2 6686 . . . . . . . . . . . . 13 (𝑥 = 𝑋 → (rec(𝐹, 𝐴)‘𝑥) = (rec(𝐹, 𝐴)‘𝑋))
8079adantl 485 . . . . . . . . . . . 12 ((𝑦 = 𝑌𝑥 = 𝑋) → (rec(𝐹, 𝐴)‘𝑥) = (rec(𝐹, 𝐴)‘𝑋))
8178, 80sseq12d 3920 . . . . . . . . . . 11 ((𝑦 = 𝑌𝑥 = 𝑋) → ((rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥) ↔ (rec(𝐹, 𝐴)‘𝑌) ⊆ (rec(𝐹, 𝐴)‘𝑋)))
8276, 81imbi12d 348 . . . . . . . . . 10 ((𝑦 = 𝑌𝑥 = 𝑋) → ((𝑦𝑥 → (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥)) ↔ (𝑌𝑋 → (rec(𝐹, 𝐴)‘𝑌) ⊆ (rec(𝐹, 𝐴)‘𝑋))))
8375, 82imbi12d 348 . . . . . . . . 9 ((𝑦 = 𝑌𝑥 = 𝑋) → ((𝑥 ∈ On → (𝑦𝑥 → (rec(𝐹, 𝐴)‘𝑦) ⊆ (rec(𝐹, 𝐴)‘𝑥))) ↔ (𝑋 ∈ On → (𝑌𝑋 → (rec(𝐹, 𝐴)‘𝑌) ⊆ (rec(𝐹, 𝐴)‘𝑋)))))
8473, 83mpbii 236 . . . . . . . 8 ((𝑦 = 𝑌𝑥 = 𝑋) → (𝑋 ∈ On → (𝑌𝑋 → (rec(𝐹, 𝐴)‘𝑌) ⊆ (rec(𝐹, 𝐴)‘𝑋))))
8584ex 416 . . . . . . 7 (𝑦 = 𝑌 → (𝑥 = 𝑋 → (𝑋 ∈ On → (𝑌𝑋 → (rec(𝐹, 𝐴)‘𝑌) ⊆ (rec(𝐹, 𝐴)‘𝑋)))))
8685vtocleg 3489 . . . . . 6 (𝑌𝑋 → (𝑥 = 𝑋 → (𝑋 ∈ On → (𝑌𝑋 → (rec(𝐹, 𝐴)‘𝑌) ⊆ (rec(𝐹, 𝐴)‘𝑋)))))
8786com12 32 . . . . 5 (𝑥 = 𝑋 → (𝑌𝑋 → (𝑋 ∈ On → (𝑌𝑋 → (rec(𝐹, 𝐴)‘𝑌) ⊆ (rec(𝐹, 𝐴)‘𝑋)))))
8887vtocleg 3489 . . . 4 (𝑋 ∈ On → (𝑌𝑋 → (𝑋 ∈ On → (𝑌𝑋 → (rec(𝐹, 𝐴)‘𝑌) ⊆ (rec(𝐹, 𝐴)‘𝑋)))))
8988pm2.43b 55 . . 3 (𝑌𝑋 → (𝑋 ∈ On → (𝑌𝑋 → (rec(𝐹, 𝐴)‘𝑌) ⊆ (rec(𝐹, 𝐴)‘𝑋))))
9089pm2.43b 55 . 2 (𝑋 ∈ On → (𝑌𝑋 → (rec(𝐹, 𝐴)‘𝑌) ⊆ (rec(𝐹, 𝐴)‘𝑋)))
9190imp 410 1 ((𝑋 ∈ On ∧ 𝑌𝑋) → (rec(𝐹, 𝐴)‘𝑌) ⊆ (rec(𝐹, 𝐴)‘𝑋))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 209  wa 399  wo 846   = wceq 1542  wcel 2114  {cab 2717  wral 3054  Vcvv 3400  [wsbc 3685  csb 3800  cun 3851  wss 3853  c0 4221   ciun 4891  cmpt 5120  Oncon0 6182  Lim wlim 6183  suc csuc 6184  cfv 6349  reccrdg 8086
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1975  ax-7 2020  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2162  ax-12 2179  ax-ext 2711  ax-rep 5164  ax-sep 5177  ax-nul 5184  ax-pr 5306  ax-un 7491
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 847  df-3or 1089  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1787  df-nf 1791  df-sb 2075  df-mo 2541  df-eu 2571  df-clab 2718  df-cleq 2731  df-clel 2812  df-nfc 2882  df-ne 2936  df-ral 3059  df-rex 3060  df-reu 3061  df-rab 3063  df-v 3402  df-sbc 3686  df-csb 3801  df-dif 3856  df-un 3858  df-in 3860  df-ss 3870  df-pss 3872  df-nul 4222  df-if 4425  df-pw 4500  df-sn 4527  df-pr 4529  df-tp 4531  df-op 4533  df-uni 4807  df-iun 4893  df-br 5041  df-opab 5103  df-mpt 5121  df-tr 5147  df-id 5439  df-eprel 5444  df-po 5452  df-so 5453  df-fr 5493  df-we 5495  df-xp 5541  df-rel 5542  df-cnv 5543  df-co 5544  df-dm 5545  df-rn 5546  df-res 5547  df-ima 5548  df-pred 6139  df-ord 6185  df-on 6186  df-lim 6187  df-suc 6188  df-iota 6307  df-fun 6351  df-fn 6352  df-f 6353  df-f1 6354  df-fo 6355  df-f1o 6356  df-fv 6357  df-wrecs 7988  df-recs 8049  df-rdg 8087
This theorem is referenced by: (None)
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