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Theorem fin23lem15 9756
Description: Lemma for fin23 9811. 𝑈 is a monotone function. (Contributed by Stefan O'Rear, 1-Nov-2014.)
Hypothesis
Ref Expression
fin23lem.a 𝑈 = seqω((𝑖 ∈ ω, 𝑢 ∈ V ↦ if(((𝑡𝑖) ∩ 𝑢) = ∅, 𝑢, ((𝑡𝑖) ∩ 𝑢))), ran 𝑡)
Assertion
Ref Expression
fin23lem15 (((𝐴 ∈ ω ∧ 𝐵 ∈ ω) ∧ 𝐵𝐴) → (𝑈𝐴) ⊆ (𝑈𝐵))
Distinct variable groups:   𝑡,𝑖,𝑢   𝐴,𝑖,𝑢   𝑈,𝑖,𝑢
Allowed substitution hints:   𝐴(𝑡)   𝐵(𝑢,𝑡,𝑖)   𝑈(𝑡)

Proof of Theorem fin23lem15
Dummy variables 𝑎 𝑏 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 fveq2 6670 . . 3 (𝑏 = 𝐵 → (𝑈𝑏) = (𝑈𝐵))
21sseq1d 3998 . 2 (𝑏 = 𝐵 → ((𝑈𝑏) ⊆ (𝑈𝐵) ↔ (𝑈𝐵) ⊆ (𝑈𝐵)))
3 fveq2 6670 . . 3 (𝑏 = 𝑎 → (𝑈𝑏) = (𝑈𝑎))
43sseq1d 3998 . 2 (𝑏 = 𝑎 → ((𝑈𝑏) ⊆ (𝑈𝐵) ↔ (𝑈𝑎) ⊆ (𝑈𝐵)))
5 fveq2 6670 . . 3 (𝑏 = suc 𝑎 → (𝑈𝑏) = (𝑈‘suc 𝑎))
65sseq1d 3998 . 2 (𝑏 = suc 𝑎 → ((𝑈𝑏) ⊆ (𝑈𝐵) ↔ (𝑈‘suc 𝑎) ⊆ (𝑈𝐵)))
7 fveq2 6670 . . 3 (𝑏 = 𝐴 → (𝑈𝑏) = (𝑈𝐴))
87sseq1d 3998 . 2 (𝑏 = 𝐴 → ((𝑈𝑏) ⊆ (𝑈𝐵) ↔ (𝑈𝐴) ⊆ (𝑈𝐵)))
9 ssidd 3990 . 2 (𝐵 ∈ ω → (𝑈𝐵) ⊆ (𝑈𝐵))
10 fin23lem.a . . . . 5 𝑈 = seqω((𝑖 ∈ ω, 𝑢 ∈ V ↦ if(((𝑡𝑖) ∩ 𝑢) = ∅, 𝑢, ((𝑡𝑖) ∩ 𝑢))), ran 𝑡)
1110fin23lem13 9754 . . . 4 (𝑎 ∈ ω → (𝑈‘suc 𝑎) ⊆ (𝑈𝑎))
1211ad2antrr 724 . . 3 (((𝑎 ∈ ω ∧ 𝐵 ∈ ω) ∧ 𝐵𝑎) → (𝑈‘suc 𝑎) ⊆ (𝑈𝑎))
13 sstr2 3974 . . 3 ((𝑈‘suc 𝑎) ⊆ (𝑈𝑎) → ((𝑈𝑎) ⊆ (𝑈𝐵) → (𝑈‘suc 𝑎) ⊆ (𝑈𝐵)))
1412, 13syl 17 . 2 (((𝑎 ∈ ω ∧ 𝐵 ∈ ω) ∧ 𝐵𝑎) → ((𝑈𝑎) ⊆ (𝑈𝐵) → (𝑈‘suc 𝑎) ⊆ (𝑈𝐵)))
152, 4, 6, 8, 9, 14findsg 7609 1 (((𝐴 ∈ ω ∧ 𝐵 ∈ ω) ∧ 𝐵𝐴) → (𝑈𝐴) ⊆ (𝑈𝐵))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 398   = wceq 1537  wcel 2114  Vcvv 3494  cin 3935  wss 3936  c0 4291  ifcif 4467   cuni 4838  ran crn 5556  suc csuc 6193  cfv 6355  cmpo 7158  ωcom 7580  seqωcseqom 8083
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793  ax-sep 5203  ax-nul 5210  ax-pow 5266  ax-pr 5330  ax-un 7461
This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-ral 3143  df-rex 3144  df-reu 3145  df-rab 3147  df-v 3496  df-sbc 3773  df-csb 3884  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-pss 3954  df-nul 4292  df-if 4468  df-pw 4541  df-sn 4568  df-pr 4570  df-tp 4572  df-op 4574  df-uni 4839  df-iun 4921  df-br 5067  df-opab 5129  df-mpt 5147  df-tr 5173  df-id 5460  df-eprel 5465  df-po 5474  df-so 5475  df-fr 5514  df-we 5516  df-xp 5561  df-rel 5562  df-cnv 5563  df-co 5564  df-dm 5565  df-rn 5566  df-res 5567  df-ima 5568  df-pred 6148  df-ord 6194  df-on 6195  df-lim 6196  df-suc 6197  df-iota 6314  df-fun 6357  df-fn 6358  df-f 6359  df-f1 6360  df-fo 6361  df-f1o 6362  df-fv 6363  df-ov 7159  df-oprab 7160  df-mpo 7161  df-om 7581  df-2nd 7690  df-wrecs 7947  df-recs 8008  df-rdg 8046  df-seqom 8084
This theorem is referenced by:  fin23lem16  9757
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