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Theorem finxp1o 33558
Description: The value of Cartesian exponentiation at one. (Contributed by ML, 17-Oct-2020.)
Assertion
Ref Expression
finxp1o (𝑈↑↑1𝑜) = 𝑈

Proof of Theorem finxp1o
Dummy variables 𝑛 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 1onn 7890 . . . . . 6 1𝑜 ∈ ω
21a1i 11 . . . . 5 (𝑦𝑈 → 1𝑜 ∈ ω)
3 finxpreclem1 33555 . . . . . 6 (𝑦𝑈 → ∅ = ((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩)))‘⟨1𝑜, 𝑦⟩))
4 1on 7737 . . . . . . . 8 1𝑜 ∈ On
5 1n0 7746 . . . . . . . 8 1𝑜 ≠ ∅
6 nnlim 7244 . . . . . . . . 9 (1𝑜 ∈ ω → ¬ Lim 1𝑜)
71, 6ax-mp 5 . . . . . . . 8 ¬ Lim 1𝑜
8 rdgsucuni 33546 . . . . . . . 8 ((1𝑜 ∈ On ∧ 1𝑜 ≠ ∅ ∧ ¬ Lim 1𝑜) → (rec((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩))), ⟨1𝑜, 𝑦⟩)‘1𝑜) = ((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩)))‘(rec((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩))), ⟨1𝑜, 𝑦⟩)‘ 1𝑜)))
94, 5, 7, 8mp3an 1573 . . . . . . 7 (rec((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩))), ⟨1𝑜, 𝑦⟩)‘1𝑜) = ((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩)))‘(rec((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩))), ⟨1𝑜, 𝑦⟩)‘ 1𝑜))
10 df-1o 7730 . . . . . . . . . . . 12 1𝑜 = suc ∅
1110unieqi 4597 . . . . . . . . . . 11 1𝑜 = suc ∅
12 0elon 5939 . . . . . . . . . . . 12 ∅ ∈ On
1312onunisuci 6002 . . . . . . . . . . 11 suc ∅ = ∅
1411, 13eqtri 2782 . . . . . . . . . 10 1𝑜 = ∅
1514fveq2i 6356 . . . . . . . . 9 (rec((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩))), ⟨1𝑜, 𝑦⟩)‘ 1𝑜) = (rec((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩))), ⟨1𝑜, 𝑦⟩)‘∅)
16 opex 5081 . . . . . . . . . 10 ⟨1𝑜, 𝑦⟩ ∈ V
1716rdg0 7687 . . . . . . . . 9 (rec((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩))), ⟨1𝑜, 𝑦⟩)‘∅) = ⟨1𝑜, 𝑦
1815, 17eqtri 2782 . . . . . . . 8 (rec((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩))), ⟨1𝑜, 𝑦⟩)‘ 1𝑜) = ⟨1𝑜, 𝑦
1918fveq2i 6356 . . . . . . 7 ((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩)))‘(rec((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩))), ⟨1𝑜, 𝑦⟩)‘ 1𝑜)) = ((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩)))‘⟨1𝑜, 𝑦⟩)
209, 19eqtri 2782 . . . . . 6 (rec((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩))), ⟨1𝑜, 𝑦⟩)‘1𝑜) = ((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩)))‘⟨1𝑜, 𝑦⟩)
213, 20syl6eqr 2812 . . . . 5 (𝑦𝑈 → ∅ = (rec((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩))), ⟨1𝑜, 𝑦⟩)‘1𝑜))
22 df-finxp 33550 . . . . . 6 (𝑈↑↑1𝑜) = {𝑦 ∣ (1𝑜 ∈ ω ∧ ∅ = (rec((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩))), ⟨1𝑜, 𝑦⟩)‘1𝑜))}
2322abeq2i 2873 . . . . 5 (𝑦 ∈ (𝑈↑↑1𝑜) ↔ (1𝑜 ∈ ω ∧ ∅ = (rec((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩))), ⟨1𝑜, 𝑦⟩)‘1𝑜)))
242, 21, 23sylanbrc 701 . . . 4 (𝑦𝑈𝑦 ∈ (𝑈↑↑1𝑜))
251, 23mpbiran 991 . . . . 5 (𝑦 ∈ (𝑈↑↑1𝑜) ↔ ∅ = (rec((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩))), ⟨1𝑜, 𝑦⟩)‘1𝑜))
26 vex 3343 . . . . . . 7 𝑦 ∈ V
2720eqcomi 2769 . . . . . . . . . 10 ((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩)))‘⟨1𝑜, 𝑦⟩) = (rec((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩))), ⟨1𝑜, 𝑦⟩)‘1𝑜)
28 finxpreclem2 33556 . . . . . . . . . . . 12 ((𝑦 ∈ V ∧ ¬ 𝑦𝑈) → ¬ ∅ = ((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩)))‘⟨1𝑜, 𝑦⟩))
2928neqned 2939 . . . . . . . . . . 11 ((𝑦 ∈ V ∧ ¬ 𝑦𝑈) → ∅ ≠ ((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩)))‘⟨1𝑜, 𝑦⟩))
3029necomd 2987 . . . . . . . . . 10 ((𝑦 ∈ V ∧ ¬ 𝑦𝑈) → ((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩)))‘⟨1𝑜, 𝑦⟩) ≠ ∅)
3127, 30syl5eqner 3007 . . . . . . . . 9 ((𝑦 ∈ V ∧ ¬ 𝑦𝑈) → (rec((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩))), ⟨1𝑜, 𝑦⟩)‘1𝑜) ≠ ∅)
3231necomd 2987 . . . . . . . 8 ((𝑦 ∈ V ∧ ¬ 𝑦𝑈) → ∅ ≠ (rec((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩))), ⟨1𝑜, 𝑦⟩)‘1𝑜))
3332neneqd 2937 . . . . . . 7 ((𝑦 ∈ V ∧ ¬ 𝑦𝑈) → ¬ ∅ = (rec((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩))), ⟨1𝑜, 𝑦⟩)‘1𝑜))
3426, 33mpan 708 . . . . . 6 𝑦𝑈 → ¬ ∅ = (rec((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩))), ⟨1𝑜, 𝑦⟩)‘1𝑜))
3534con4i 113 . . . . 5 (∅ = (rec((𝑛 ∈ ω, 𝑥 ∈ V ↦ if((𝑛 = 1𝑜𝑥𝑈), ∅, if(𝑥 ∈ (V × 𝑈), ⟨ 𝑛, (1st𝑥)⟩, ⟨𝑛, 𝑥⟩))), ⟨1𝑜, 𝑦⟩)‘1𝑜) → 𝑦𝑈)
3625, 35sylbi 207 . . . 4 (𝑦 ∈ (𝑈↑↑1𝑜) → 𝑦𝑈)
3724, 36impbii 199 . . 3 (𝑦𝑈𝑦 ∈ (𝑈↑↑1𝑜))
3837eqriv 2757 . 2 𝑈 = (𝑈↑↑1𝑜)
3938eqcomi 2769 1 (𝑈↑↑1𝑜) = 𝑈
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wa 383   = wceq 1632  wcel 2139  wne 2932  Vcvv 3340  c0 4058  ifcif 4230  cop 4327   cuni 4588   × cxp 5264  Oncon0 5884  Lim wlim 5885  suc csuc 5886  cfv 6049  cmpt2 6816  ωcom 7231  1st c1st 7332  reccrdg 7675  1𝑜c1o 7723  ↑↑cfinxp 33549
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1871  ax-4 1886  ax-5 1988  ax-6 2054  ax-7 2090  ax-8 2141  ax-9 2148  ax-10 2168  ax-11 2183  ax-12 2196  ax-13 2391  ax-ext 2740  ax-rep 4923  ax-sep 4933  ax-nul 4941  ax-pow 4992  ax-pr 5055  ax-un 7115
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1073  df-3an 1074  df-tru 1635  df-fal 1638  df-ex 1854  df-nf 1859  df-sb 2047  df-eu 2611  df-mo 2612  df-clab 2747  df-cleq 2753  df-clel 2756  df-nfc 2891  df-ne 2933  df-ral 3055  df-rex 3056  df-reu 3057  df-rab 3059  df-v 3342  df-sbc 3577  df-csb 3675  df-dif 3718  df-un 3720  df-in 3722  df-ss 3729  df-pss 3731  df-nul 4059  df-if 4231  df-pw 4304  df-sn 4322  df-pr 4324  df-tp 4326  df-op 4328  df-uni 4589  df-iun 4674  df-br 4805  df-opab 4865  df-mpt 4882  df-tr 4905  df-id 5174  df-eprel 5179  df-po 5187  df-so 5188  df-fr 5225  df-we 5227  df-xp 5272  df-rel 5273  df-cnv 5274  df-co 5275  df-dm 5276  df-rn 5277  df-res 5278  df-ima 5279  df-pred 5841  df-ord 5887  df-on 5888  df-lim 5889  df-suc 5890  df-iota 6012  df-fun 6051  df-fn 6052  df-f 6053  df-f1 6054  df-fo 6055  df-f1o 6056  df-fv 6057  df-ov 6817  df-oprab 6818  df-mpt2 6819  df-om 7232  df-wrecs 7577  df-recs 7638  df-rdg 7676  df-1o 7730  df-finxp 33550
This theorem is referenced by:  finxp2o  33565  finxp00  33568
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