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Theorem 2omapen 16473
Description: Equinumerosity of (2o𝑚 𝐴) and the set of decidable subsets of 𝐴. (Contributed by Jim Kingdon, 14-Nov-2025.)
Assertion
Ref Expression
2omapen (𝐴𝑉 → (2o𝑚 𝐴) ≈ {𝑥 ∈ 𝒫 𝐴 ∣ ∀𝑦𝐴 DECID 𝑦𝑥})
Distinct variable groups:   𝑥,𝐴,𝑦   𝑦,𝑉
Allowed substitution hint:   𝑉(𝑥)

Proof of Theorem 2omapen
Dummy variables 𝑠 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 fnmap 6815 . . 3 𝑚 Fn (V × V)
2 2onn 6680 . . . 4 2o ∈ ω
32elexi 2812 . . 3 2o ∈ V
4 elex 2811 . . 3 (𝐴𝑉𝐴 ∈ V)
5 fnovex 6043 . . 3 (( ↑𝑚 Fn (V × V) ∧ 2o ∈ V ∧ 𝐴 ∈ V) → (2o𝑚 𝐴) ∈ V)
61, 3, 4, 5mp3an12i 1375 . 2 (𝐴𝑉 → (2o𝑚 𝐴) ∈ V)
7 eqid 2229 . . 3 (𝑠 ∈ (2o𝑚 𝐴) ↦ {𝑧𝐴 ∣ (𝑠𝑧) = 1o}) = (𝑠 ∈ (2o𝑚 𝐴) ↦ {𝑧𝐴 ∣ (𝑠𝑧) = 1o})
872omap 16472 . 2 (𝐴𝑉 → (𝑠 ∈ (2o𝑚 𝐴) ↦ {𝑧𝐴 ∣ (𝑠𝑧) = 1o}):(2o𝑚 𝐴)–1-1-onto→{𝑥 ∈ 𝒫 𝐴 ∣ ∀𝑦𝐴 DECID 𝑦𝑥})
9 f1oeng 6921 . 2 (((2o𝑚 𝐴) ∈ V ∧ (𝑠 ∈ (2o𝑚 𝐴) ↦ {𝑧𝐴 ∣ (𝑠𝑧) = 1o}):(2o𝑚 𝐴)–1-1-onto→{𝑥 ∈ 𝒫 𝐴 ∣ ∀𝑦𝐴 DECID 𝑦𝑥}) → (2o𝑚 𝐴) ≈ {𝑥 ∈ 𝒫 𝐴 ∣ ∀𝑦𝐴 DECID 𝑦𝑥})
106, 8, 9syl2anc 411 1 (𝐴𝑉 → (2o𝑚 𝐴) ≈ {𝑥 ∈ 𝒫 𝐴 ∣ ∀𝑦𝐴 DECID 𝑦𝑥})
Colors of variables: wff set class
Syntax hints:  wi 4  DECID wdc 839   = wceq 1395  wcel 2200  wral 2508  {crab 2512  Vcvv 2799  𝒫 cpw 3649   class class class wbr 4083  cmpt 4145  ωcom 4683   × cxp 4718   Fn wfn 5316  1-1-ontowf1o 5320  cfv 5321  (class class class)co 6010  1oc1o 6566  2oc2o 6567  𝑚 cmap 6808  cen 6898
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 4259  ax-pr 4294  ax-un 4525  ax-setind 4630  ax-iinf 4681
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 4385  df-iord 4458  df-on 4460  df-suc 4463  df-iom 4684  df-xp 4726  df-rel 4727  df-cnv 4728  df-co 4729  df-dm 4730  df-rn 4731  df-res 4732  df-ima 4733  df-iota 5281  df-fun 5323  df-fn 5324  df-f 5325  df-f1 5326  df-fo 5327  df-f1o 5328  df-fv 5329  df-ov 6013  df-oprab 6014  df-mpo 6015  df-1st 6295  df-2nd 6296  df-1o 6573  df-2o 6574  df-map 6810  df-en 6901
This theorem is referenced by: (None)
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