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Theorem harval 8508
Description: Function value of the Hartogs function. (Contributed by Stefan O'Rear, 11-Feb-2015.)
Assertion
Ref Expression
harval (𝑋𝑉 → (har‘𝑋) = {𝑦 ∈ On ∣ 𝑦𝑋})
Distinct variable group:   𝑦,𝑋
Allowed substitution hint:   𝑉(𝑦)

Proof of Theorem harval
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 elex 3243 . 2 (𝑋𝑉𝑋 ∈ V)
2 breq2 4689 . . . 4 (𝑥 = 𝑋 → (𝑦𝑥𝑦𝑋))
32rabbidv 3220 . . 3 (𝑥 = 𝑋 → {𝑦 ∈ On ∣ 𝑦𝑥} = {𝑦 ∈ On ∣ 𝑦𝑋})
4 df-har 8504 . . 3 har = (𝑥 ∈ V ↦ {𝑦 ∈ On ∣ 𝑦𝑥})
5 hartogs 8490 . . 3 (𝑥 ∈ V → {𝑦 ∈ On ∣ 𝑦𝑥} ∈ On)
63, 4, 5fvmpt3 6325 . 2 (𝑋 ∈ V → (har‘𝑋) = {𝑦 ∈ On ∣ 𝑦𝑋})
71, 6syl 17 1 (𝑋𝑉 → (har‘𝑋) = {𝑦 ∈ On ∣ 𝑦𝑋})
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1523  wcel 2030  {crab 2945  Vcvv 3231   class class class wbr 4685  Oncon0 5761  cfv 5926  cdom 7995  harchar 8502
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-rep 4804  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1055  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-ral 2946  df-rex 2947  df-reu 2948  df-rmo 2949  df-rab 2950  df-v 3233  df-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-pss 3623  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-tp 4215  df-op 4217  df-uni 4469  df-iun 4554  df-br 4686  df-opab 4746  df-mpt 4763  df-tr 4786  df-id 5053  df-eprel 5058  df-po 5064  df-so 5065  df-fr 5102  df-se 5103  df-we 5104  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-pred 5718  df-ord 5764  df-on 5765  df-lim 5766  df-suc 5767  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-f1 5931  df-fo 5932  df-f1o 5933  df-fv 5934  df-isom 5935  df-riota 6651  df-wrecs 7452  df-recs 7513  df-en 7998  df-dom 7999  df-oi 8456  df-har 8504
This theorem is referenced by:  elharval  8509  harword  8511  harwdom  8536  harval2  8861
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