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Theorem csbrdgg 33512
Description: Move class substitution in and out of the recursive function generator. (Contributed by ML, 25-Oct-2020.)
Assertion
Ref Expression
csbrdgg (𝐴𝑉𝐴 / 𝑥rec(𝐹, 𝐼) = rec(𝐴 / 𝑥𝐹, 𝐴 / 𝑥𝐼))

Proof of Theorem csbrdgg
Dummy variable 𝑔 is distinct from all other variables.
StepHypRef Expression
1 csbrecsg 33511 . . 3 (𝐴𝑉𝐴 / 𝑥recs((𝑔 ∈ V ↦ if(𝑔 = ∅, 𝐼, if(Lim dom 𝑔, ran 𝑔, (𝐹‘(𝑔 dom 𝑔)))))) = recs(𝐴 / 𝑥(𝑔 ∈ V ↦ if(𝑔 = ∅, 𝐼, if(Lim dom 𝑔, ran 𝑔, (𝐹‘(𝑔 dom 𝑔)))))))
2 csbmpt2 5144 . . . . 5 (𝐴𝑉𝐴 / 𝑥(𝑔 ∈ V ↦ if(𝑔 = ∅, 𝐼, if(Lim dom 𝑔, ran 𝑔, (𝐹‘(𝑔 dom 𝑔))))) = (𝑔 ∈ V ↦ 𝐴 / 𝑥if(𝑔 = ∅, 𝐼, if(Lim dom 𝑔, ran 𝑔, (𝐹‘(𝑔 dom 𝑔))))))
3 csbif 4277 . . . . . . 7 𝐴 / 𝑥if(𝑔 = ∅, 𝐼, if(Lim dom 𝑔, ran 𝑔, (𝐹‘(𝑔 dom 𝑔)))) = if([𝐴 / 𝑥]𝑔 = ∅, 𝐴 / 𝑥𝐼, 𝐴 / 𝑥if(Lim dom 𝑔, ran 𝑔, (𝐹‘(𝑔 dom 𝑔))))
4 sbcg 3653 . . . . . . . 8 (𝐴𝑉 → ([𝐴 / 𝑥]𝑔 = ∅ ↔ 𝑔 = ∅))
5 csbif 4277 . . . . . . . . 9 𝐴 / 𝑥if(Lim dom 𝑔, ran 𝑔, (𝐹‘(𝑔 dom 𝑔))) = if([𝐴 / 𝑥]Lim dom 𝑔, 𝐴 / 𝑥 ran 𝑔, 𝐴 / 𝑥(𝐹‘(𝑔 dom 𝑔)))
6 sbcg 3653 . . . . . . . . . 10 (𝐴𝑉 → ([𝐴 / 𝑥]Lim dom 𝑔 ↔ Lim dom 𝑔))
7 csbconstg 3695 . . . . . . . . . 10 (𝐴𝑉𝐴 / 𝑥 ran 𝑔 = ran 𝑔)
8 csbfv12 6372 . . . . . . . . . . 11 𝐴 / 𝑥(𝐹‘(𝑔 dom 𝑔)) = (𝐴 / 𝑥𝐹𝐴 / 𝑥(𝑔 dom 𝑔))
9 csbconstg 3695 . . . . . . . . . . . 12 (𝐴𝑉𝐴 / 𝑥(𝑔 dom 𝑔) = (𝑔 dom 𝑔))
109fveq2d 6336 . . . . . . . . . . 11 (𝐴𝑉 → (𝐴 / 𝑥𝐹𝐴 / 𝑥(𝑔 dom 𝑔)) = (𝐴 / 𝑥𝐹‘(𝑔 dom 𝑔)))
118, 10syl5eq 2817 . . . . . . . . . 10 (𝐴𝑉𝐴 / 𝑥(𝐹‘(𝑔 dom 𝑔)) = (𝐴 / 𝑥𝐹‘(𝑔 dom 𝑔)))
126, 7, 11ifbieq12d 4252 . . . . . . . . 9 (𝐴𝑉 → if([𝐴 / 𝑥]Lim dom 𝑔, 𝐴 / 𝑥 ran 𝑔, 𝐴 / 𝑥(𝐹‘(𝑔 dom 𝑔))) = if(Lim dom 𝑔, ran 𝑔, (𝐴 / 𝑥𝐹‘(𝑔 dom 𝑔))))
135, 12syl5eq 2817 . . . . . . . 8 (𝐴𝑉𝐴 / 𝑥if(Lim dom 𝑔, ran 𝑔, (𝐹‘(𝑔 dom 𝑔))) = if(Lim dom 𝑔, ran 𝑔, (𝐴 / 𝑥𝐹‘(𝑔 dom 𝑔))))
144, 13ifbieq2d 4250 . . . . . . 7 (𝐴𝑉 → if([𝐴 / 𝑥]𝑔 = ∅, 𝐴 / 𝑥𝐼, 𝐴 / 𝑥if(Lim dom 𝑔, ran 𝑔, (𝐹‘(𝑔 dom 𝑔)))) = if(𝑔 = ∅, 𝐴 / 𝑥𝐼, if(Lim dom 𝑔, ran 𝑔, (𝐴 / 𝑥𝐹‘(𝑔 dom 𝑔)))))
153, 14syl5eq 2817 . . . . . 6 (𝐴𝑉𝐴 / 𝑥if(𝑔 = ∅, 𝐼, if(Lim dom 𝑔, ran 𝑔, (𝐹‘(𝑔 dom 𝑔)))) = if(𝑔 = ∅, 𝐴 / 𝑥𝐼, if(Lim dom 𝑔, ran 𝑔, (𝐴 / 𝑥𝐹‘(𝑔 dom 𝑔)))))
1615mpteq2dv 4879 . . . . 5 (𝐴𝑉 → (𝑔 ∈ V ↦ 𝐴 / 𝑥if(𝑔 = ∅, 𝐼, if(Lim dom 𝑔, ran 𝑔, (𝐹‘(𝑔 dom 𝑔))))) = (𝑔 ∈ V ↦ if(𝑔 = ∅, 𝐴 / 𝑥𝐼, if(Lim dom 𝑔, ran 𝑔, (𝐴 / 𝑥𝐹‘(𝑔 dom 𝑔))))))
172, 16eqtrd 2805 . . . 4 (𝐴𝑉𝐴 / 𝑥(𝑔 ∈ V ↦ if(𝑔 = ∅, 𝐼, if(Lim dom 𝑔, ran 𝑔, (𝐹‘(𝑔 dom 𝑔))))) = (𝑔 ∈ V ↦ if(𝑔 = ∅, 𝐴 / 𝑥𝐼, if(Lim dom 𝑔, ran 𝑔, (𝐴 / 𝑥𝐹‘(𝑔 dom 𝑔))))))
18 recseq 7623 . . . 4 (𝐴 / 𝑥(𝑔 ∈ V ↦ if(𝑔 = ∅, 𝐼, if(Lim dom 𝑔, ran 𝑔, (𝐹‘(𝑔 dom 𝑔))))) = (𝑔 ∈ V ↦ if(𝑔 = ∅, 𝐴 / 𝑥𝐼, if(Lim dom 𝑔, ran 𝑔, (𝐴 / 𝑥𝐹‘(𝑔 dom 𝑔))))) → recs(𝐴 / 𝑥(𝑔 ∈ V ↦ if(𝑔 = ∅, 𝐼, if(Lim dom 𝑔, ran 𝑔, (𝐹‘(𝑔 dom 𝑔)))))) = recs((𝑔 ∈ V ↦ if(𝑔 = ∅, 𝐴 / 𝑥𝐼, if(Lim dom 𝑔, ran 𝑔, (𝐴 / 𝑥𝐹‘(𝑔 dom 𝑔)))))))
1917, 18syl 17 . . 3 (𝐴𝑉 → recs(𝐴 / 𝑥(𝑔 ∈ V ↦ if(𝑔 = ∅, 𝐼, if(Lim dom 𝑔, ran 𝑔, (𝐹‘(𝑔 dom 𝑔)))))) = recs((𝑔 ∈ V ↦ if(𝑔 = ∅, 𝐴 / 𝑥𝐼, if(Lim dom 𝑔, ran 𝑔, (𝐴 / 𝑥𝐹‘(𝑔 dom 𝑔)))))))
201, 19eqtrd 2805 . 2 (𝐴𝑉𝐴 / 𝑥recs((𝑔 ∈ V ↦ if(𝑔 = ∅, 𝐼, if(Lim dom 𝑔, ran 𝑔, (𝐹‘(𝑔 dom 𝑔)))))) = recs((𝑔 ∈ V ↦ if(𝑔 = ∅, 𝐴 / 𝑥𝐼, if(Lim dom 𝑔, ran 𝑔, (𝐴 / 𝑥𝐹‘(𝑔 dom 𝑔)))))))
21 df-rdg 7659 . . 3 rec(𝐹, 𝐼) = recs((𝑔 ∈ V ↦ if(𝑔 = ∅, 𝐼, if(Lim dom 𝑔, ran 𝑔, (𝐹‘(𝑔 dom 𝑔))))))
2221csbeq2i 4137 . 2 𝐴 / 𝑥rec(𝐹, 𝐼) = 𝐴 / 𝑥recs((𝑔 ∈ V ↦ if(𝑔 = ∅, 𝐼, if(Lim dom 𝑔, ran 𝑔, (𝐹‘(𝑔 dom 𝑔))))))
23 df-rdg 7659 . 2 rec(𝐴 / 𝑥𝐹, 𝐴 / 𝑥𝐼) = recs((𝑔 ∈ V ↦ if(𝑔 = ∅, 𝐴 / 𝑥𝐼, if(Lim dom 𝑔, ran 𝑔, (𝐴 / 𝑥𝐹‘(𝑔 dom 𝑔))))))
2420, 22, 233eqtr4g 2830 1 (𝐴𝑉𝐴 / 𝑥rec(𝐹, 𝐼) = rec(𝐴 / 𝑥𝐹, 𝐴 / 𝑥𝐼))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1631  wcel 2145  Vcvv 3351  [wsbc 3587  csb 3682  c0 4063  ifcif 4225   cuni 4574  cmpt 4863  dom cdm 5249  ran crn 5250  Lim wlim 5867  cfv 6031  recscrecs 7620  reccrdg 7658
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1870  ax-4 1885  ax-5 1991  ax-6 2057  ax-7 2093  ax-8 2147  ax-9 2154  ax-10 2174  ax-11 2190  ax-12 2203  ax-13 2408  ax-ext 2751  ax-sep 4915  ax-nul 4923  ax-pow 4974  ax-pr 5034
This theorem depends on definitions:  df-bi 197  df-an 383  df-or 835  df-3an 1073  df-tru 1634  df-fal 1637  df-ex 1853  df-nf 1858  df-sb 2050  df-eu 2622  df-mo 2623  df-clab 2758  df-cleq 2764  df-clel 2767  df-nfc 2902  df-ne 2944  df-ral 3066  df-rex 3067  df-rab 3070  df-v 3353  df-sbc 3588  df-csb 3683  df-dif 3726  df-un 3728  df-in 3730  df-ss 3737  df-nul 4064  df-if 4226  df-sn 4317  df-pr 4319  df-op 4323  df-uni 4575  df-br 4787  df-opab 4847  df-mpt 4864  df-xp 5255  df-cnv 5257  df-dm 5259  df-rn 5260  df-res 5261  df-ima 5262  df-pred 5823  df-iota 5994  df-fv 6039  df-wrecs 7559  df-recs 7621  df-rdg 7659
This theorem is referenced by:  csbfinxpg  33562
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