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Theorem nninfwlpoimlemdc 7352
Description: Lemma for nninfwlpoim 7354. (Contributed by Jim Kingdon, 8-Dec-2024.)
Hypotheses
Ref Expression
nninfwlpoimlemg.f (𝜑𝐹:ω⟶2o)
nninfwlpoimlemg.g 𝐺 = (𝑖 ∈ ω ↦ if(∃𝑥 ∈ suc 𝑖(𝐹𝑥) = ∅, ∅, 1o))
nninfwlpoilemdc.eq (𝜑 → ∀𝑥 ∈ ℕ𝑦 ∈ ℕ DECID 𝑥 = 𝑦)
Assertion
Ref Expression
nninfwlpoimlemdc (𝜑DECID𝑛 ∈ ω (𝐹𝑛) = 1o)
Distinct variable groups:   𝜑,𝑛,𝑥,𝑖   𝑛,𝐺,𝑥,𝑖   𝑦,𝐺,𝑥,𝑖   𝑛,𝐹,𝑥,𝑖
Allowed substitution hints:   𝜑(𝑦)   𝐹(𝑦)

Proof of Theorem nninfwlpoimlemdc
StepHypRef Expression
1 eqeq2 2239 . . . 4 (𝑦 = (𝑖 ∈ ω ↦ 1o) → (𝐺 = 𝑦𝐺 = (𝑖 ∈ ω ↦ 1o)))
21dcbid 843 . . 3 (𝑦 = (𝑖 ∈ ω ↦ 1o) → (DECID 𝐺 = 𝑦DECID 𝐺 = (𝑖 ∈ ω ↦ 1o)))
3 eqeq1 2236 . . . . . 6 (𝑥 = 𝐺 → (𝑥 = 𝑦𝐺 = 𝑦))
43dcbid 843 . . . . 5 (𝑥 = 𝐺 → (DECID 𝑥 = 𝑦DECID 𝐺 = 𝑦))
54ralbidv 2530 . . . 4 (𝑥 = 𝐺 → (∀𝑦 ∈ ℕ DECID 𝑥 = 𝑦 ↔ ∀𝑦 ∈ ℕ DECID 𝐺 = 𝑦))
6 nninfwlpoilemdc.eq . . . 4 (𝜑 → ∀𝑥 ∈ ℕ𝑦 ∈ ℕ DECID 𝑥 = 𝑦)
7 nninfwlpoimlemg.f . . . . 5 (𝜑𝐹:ω⟶2o)
8 nninfwlpoimlemg.g . . . . 5 𝐺 = (𝑖 ∈ ω ↦ if(∃𝑥 ∈ suc 𝑖(𝐹𝑥) = ∅, ∅, 1o))
97, 8nninfwlpoimlemg 7350 . . . 4 (𝜑𝐺 ∈ ℕ)
105, 6, 9rspcdva 2912 . . 3 (𝜑 → ∀𝑦 ∈ ℕ DECID 𝐺 = 𝑦)
11 infnninf 7299 . . . 4 (𝑖 ∈ ω ↦ 1o) ∈ ℕ
1211a1i 9 . . 3 (𝜑 → (𝑖 ∈ ω ↦ 1o) ∈ ℕ)
132, 10, 12rspcdva 2912 . 2 (𝜑DECID 𝐺 = (𝑖 ∈ ω ↦ 1o))
147, 8nninfwlpoimlemginf 7351 . . 3 (𝜑 → (𝐺 = (𝑖 ∈ ω ↦ 1o) ↔ ∀𝑛 ∈ ω (𝐹𝑛) = 1o))
1514dcbid 843 . 2 (𝜑 → (DECID 𝐺 = (𝑖 ∈ ω ↦ 1o) ↔ DECID𝑛 ∈ ω (𝐹𝑛) = 1o))
1613, 15mpbid 147 1 (𝜑DECID𝑛 ∈ ω (𝐹𝑛) = 1o)
Colors of variables: wff set class
Syntax hints:  wi 4  DECID wdc 839   = wceq 1395  wcel 2200  wral 2508  wrex 2509  c0 3491  ifcif 3602  cmpt 4145  suc csuc 4456  ωcom 4682  wf 5314  cfv 5318  1oc1o 6561  2oc2o 6562  xnninf 7294
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-coll 4199  ax-sep 4202  ax-nul 4210  ax-pow 4258  ax-pr 4293  ax-un 4524  ax-setind 4629  ax-iinf 4680
This theorem depends on definitions:  df-bi 117  df-dc 840  df-3or 1003  df-3an 1004  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-ral 2513  df-rex 2514  df-reu 2515  df-rab 2517  df-v 2801  df-sbc 3029  df-csb 3125  df-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-nul 3492  df-if 3603  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3889  df-int 3924  df-iun 3967  df-br 4084  df-opab 4146  df-mpt 4147  df-tr 4183  df-id 4384  df-iord 4457  df-on 4459  df-suc 4462  df-iom 4683  df-xp 4725  df-rel 4726  df-cnv 4727  df-co 4728  df-dm 4729  df-rn 4730  df-res 4731  df-ima 4732  df-iota 5278  df-fun 5320  df-fn 5321  df-f 5322  df-f1 5323  df-fo 5324  df-f1o 5325  df-fv 5326  df-ov 6010  df-oprab 6011  df-mpo 6012  df-1o 6568  df-2o 6569  df-er 6688  df-map 6805  df-en 6896  df-fin 6898  df-nninf 7295
This theorem is referenced by:  nninfwlpoim  7354
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