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Theorem csbfv12gALTOLD 38074
 Description: Move class substitution in and out of a function value. The proof is derived from the virtual deduction proof csbfv12gALTVD 38157. (Contributed by Alan Sare, 10-Nov-2012.) Obsolete as of 20-Aug-2018. Use csbfv12 6141 instead. (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
csbfv12gALTOLD (𝐴𝐶𝐴 / 𝑥(𝐹𝐵) = (𝐴 / 𝑥𝐹𝐴 / 𝑥𝐵))

Proof of Theorem csbfv12gALTOLD
Dummy variable 𝑦 is distinct from all other variables.
StepHypRef Expression
1 csbuni 4402 . . . 4 𝐴 / 𝑥 {𝑦 ∣ (𝐹 “ {𝐵}) = {𝑦}} = 𝐴 / 𝑥{𝑦 ∣ (𝐹 “ {𝐵}) = {𝑦}}
21a1i 11 . . 3 (𝐴𝐶𝐴 / 𝑥 {𝑦 ∣ (𝐹 “ {𝐵}) = {𝑦}} = 𝐴 / 𝑥{𝑦 ∣ (𝐹 “ {𝐵}) = {𝑦}})
3 csbab 3960 . . . . . 6 𝐴 / 𝑥{𝑦 ∣ (𝐹 “ {𝐵}) = {𝑦}} = {𝑦[𝐴 / 𝑥](𝐹 “ {𝐵}) = {𝑦}}
43a1i 11 . . . . 5 (𝐴𝐶𝐴 / 𝑥{𝑦 ∣ (𝐹 “ {𝐵}) = {𝑦}} = {𝑦[𝐴 / 𝑥](𝐹 “ {𝐵}) = {𝑦}})
5 sbceqg 3936 . . . . . . 7 (𝐴𝐶 → ([𝐴 / 𝑥](𝐹 “ {𝐵}) = {𝑦} ↔ 𝐴 / 𝑥(𝐹 “ {𝐵}) = 𝐴 / 𝑥{𝑦}))
6 csbima12 5402 . . . . . . . . . 10 𝐴 / 𝑥(𝐹 “ {𝐵}) = (𝐴 / 𝑥𝐹𝐴 / 𝑥{𝐵})
76a1i 11 . . . . . . . . 9 (𝐴𝐶𝐴 / 𝑥(𝐹 “ {𝐵}) = (𝐴 / 𝑥𝐹𝐴 / 𝑥{𝐵}))
8 csbsng 4190 . . . . . . . . . 10 (𝐴𝐶𝐴 / 𝑥{𝐵} = {𝐴 / 𝑥𝐵})
98imaeq2d 5385 . . . . . . . . 9 (𝐴𝐶 → (𝐴 / 𝑥𝐹𝐴 / 𝑥{𝐵}) = (𝐴 / 𝑥𝐹 “ {𝐴 / 𝑥𝐵}))
107, 9eqtrd 2644 . . . . . . . 8 (𝐴𝐶𝐴 / 𝑥(𝐹 “ {𝐵}) = (𝐴 / 𝑥𝐹 “ {𝐴 / 𝑥𝐵}))
11 csbconstg 3512 . . . . . . . 8 (𝐴𝐶𝐴 / 𝑥{𝑦} = {𝑦})
1210, 11eqeq12d 2625 . . . . . . 7 (𝐴𝐶 → (𝐴 / 𝑥(𝐹 “ {𝐵}) = 𝐴 / 𝑥{𝑦} ↔ (𝐴 / 𝑥𝐹 “ {𝐴 / 𝑥𝐵}) = {𝑦}))
135, 12bitrd 267 . . . . . 6 (𝐴𝐶 → ([𝐴 / 𝑥](𝐹 “ {𝐵}) = {𝑦} ↔ (𝐴 / 𝑥𝐹 “ {𝐴 / 𝑥𝐵}) = {𝑦}))
1413abbidv 2728 . . . . 5 (𝐴𝐶 → {𝑦[𝐴 / 𝑥](𝐹 “ {𝐵}) = {𝑦}} = {𝑦 ∣ (𝐴 / 𝑥𝐹 “ {𝐴 / 𝑥𝐵}) = {𝑦}})
154, 14eqtrd 2644 . . . 4 (𝐴𝐶𝐴 / 𝑥{𝑦 ∣ (𝐹 “ {𝐵}) = {𝑦}} = {𝑦 ∣ (𝐴 / 𝑥𝐹 “ {𝐴 / 𝑥𝐵}) = {𝑦}})
1615unieqd 4382 . . 3 (𝐴𝐶 𝐴 / 𝑥{𝑦 ∣ (𝐹 “ {𝐵}) = {𝑦}} = {𝑦 ∣ (𝐴 / 𝑥𝐹 “ {𝐴 / 𝑥𝐵}) = {𝑦}})
172, 16eqtrd 2644 . 2 (𝐴𝐶𝐴 / 𝑥 {𝑦 ∣ (𝐹 “ {𝐵}) = {𝑦}} = {𝑦 ∣ (𝐴 / 𝑥𝐹 “ {𝐴 / 𝑥𝐵}) = {𝑦}})
18 dffv4 6100 . . 3 (𝐹𝐵) = {𝑦 ∣ (𝐹 “ {𝐵}) = {𝑦}}
1918csbeq2i 3945 . 2 𝐴 / 𝑥(𝐹𝐵) = 𝐴 / 𝑥 {𝑦 ∣ (𝐹 “ {𝐵}) = {𝑦}}
20 dffv4 6100 . 2 (𝐴 / 𝑥𝐹𝐴 / 𝑥𝐵) = {𝑦 ∣ (𝐴 / 𝑥𝐹 “ {𝐴 / 𝑥𝐵}) = {𝑦}}
2117, 19, 203eqtr4g 2669 1 (𝐴𝐶𝐴 / 𝑥(𝐹𝐵) = (𝐴 / 𝑥𝐹𝐴 / 𝑥𝐵))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   = wceq 1475   ∈ wcel 1977  {cab 2596  [wsbc 3402  ⦋csb 3499  {csn 4125  ∪ cuni 4372   “ cima 5041  ‘cfv 5804 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833 This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3an 1033  df-tru 1478  df-fal 1481  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ral 2901  df-rex 2902  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-sn 4126  df-pr 4128  df-op 4132  df-uni 4373  df-br 4584  df-opab 4644  df-xp 5044  df-cnv 5046  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-iota 5768  df-fv 5812 This theorem is referenced by: (None)
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