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Theorem cbvralcsf 3598
Description: A more general version of cbvralf 3195 that doesn't require 𝐴 and 𝐵 to be distinct from 𝑥 or 𝑦. Changes bound variables using implicit substitution. (Contributed by Andrew Salmon, 13-Jul-2011.)
Hypotheses
Ref Expression
cbvralcsf.1 𝑦𝐴
cbvralcsf.2 𝑥𝐵
cbvralcsf.3 𝑦𝜑
cbvralcsf.4 𝑥𝜓
cbvralcsf.5 (𝑥 = 𝑦𝐴 = 𝐵)
cbvralcsf.6 (𝑥 = 𝑦 → (𝜑𝜓))
Assertion
Ref Expression
cbvralcsf (∀𝑥𝐴 𝜑 ↔ ∀𝑦𝐵 𝜓)

Proof of Theorem cbvralcsf
Dummy variables 𝑣 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 nfv 1883 . . . 4 𝑧(𝑥𝐴𝜑)
2 nfcsb1v 3582 . . . . . 6 𝑥𝑧 / 𝑥𝐴
32nfcri 2787 . . . . 5 𝑥 𝑧𝑧 / 𝑥𝐴
4 nfsbc1v 3488 . . . . 5 𝑥[𝑧 / 𝑥]𝜑
53, 4nfim 1865 . . . 4 𝑥(𝑧𝑧 / 𝑥𝐴[𝑧 / 𝑥]𝜑)
6 id 22 . . . . . 6 (𝑥 = 𝑧𝑥 = 𝑧)
7 csbeq1a 3575 . . . . . 6 (𝑥 = 𝑧𝐴 = 𝑧 / 𝑥𝐴)
86, 7eleq12d 2724 . . . . 5 (𝑥 = 𝑧 → (𝑥𝐴𝑧𝑧 / 𝑥𝐴))
9 sbceq1a 3479 . . . . 5 (𝑥 = 𝑧 → (𝜑[𝑧 / 𝑥]𝜑))
108, 9imbi12d 333 . . . 4 (𝑥 = 𝑧 → ((𝑥𝐴𝜑) ↔ (𝑧𝑧 / 𝑥𝐴[𝑧 / 𝑥]𝜑)))
111, 5, 10cbval 2307 . . 3 (∀𝑥(𝑥𝐴𝜑) ↔ ∀𝑧(𝑧𝑧 / 𝑥𝐴[𝑧 / 𝑥]𝜑))
12 nfcv 2793 . . . . . . 7 𝑦𝑧
13 cbvralcsf.1 . . . . . . 7 𝑦𝐴
1412, 13nfcsb 3584 . . . . . 6 𝑦𝑧 / 𝑥𝐴
1514nfcri 2787 . . . . 5 𝑦 𝑧𝑧 / 𝑥𝐴
16 cbvralcsf.3 . . . . . 6 𝑦𝜑
1712, 16nfsbc 3490 . . . . 5 𝑦[𝑧 / 𝑥]𝜑
1815, 17nfim 1865 . . . 4 𝑦(𝑧𝑧 / 𝑥𝐴[𝑧 / 𝑥]𝜑)
19 nfv 1883 . . . 4 𝑧(𝑦𝐵𝜓)
20 id 22 . . . . . 6 (𝑧 = 𝑦𝑧 = 𝑦)
21 csbeq1 3569 . . . . . . 7 (𝑧 = 𝑦𝑧 / 𝑥𝐴 = 𝑦 / 𝑥𝐴)
22 df-csb 3567 . . . . . . . 8 𝑦 / 𝑥𝐴 = {𝑣[𝑦 / 𝑥]𝑣𝐴}
23 cbvralcsf.2 . . . . . . . . . . . 12 𝑥𝐵
2423nfcri 2787 . . . . . . . . . . 11 𝑥 𝑣𝐵
25 cbvralcsf.5 . . . . . . . . . . . 12 (𝑥 = 𝑦𝐴 = 𝐵)
2625eleq2d 2716 . . . . . . . . . . 11 (𝑥 = 𝑦 → (𝑣𝐴𝑣𝐵))
2724, 26sbie 2436 . . . . . . . . . 10 ([𝑦 / 𝑥]𝑣𝐴𝑣𝐵)
28 sbsbc 3472 . . . . . . . . . 10 ([𝑦 / 𝑥]𝑣𝐴[𝑦 / 𝑥]𝑣𝐴)
2927, 28bitr3i 266 . . . . . . . . 9 (𝑣𝐵[𝑦 / 𝑥]𝑣𝐴)
3029abbi2i 2767 . . . . . . . 8 𝐵 = {𝑣[𝑦 / 𝑥]𝑣𝐴}
3122, 30eqtr4i 2676 . . . . . . 7 𝑦 / 𝑥𝐴 = 𝐵
3221, 31syl6eq 2701 . . . . . 6 (𝑧 = 𝑦𝑧 / 𝑥𝐴 = 𝐵)
3320, 32eleq12d 2724 . . . . 5 (𝑧 = 𝑦 → (𝑧𝑧 / 𝑥𝐴𝑦𝐵))
34 dfsbcq 3470 . . . . . 6 (𝑧 = 𝑦 → ([𝑧 / 𝑥]𝜑[𝑦 / 𝑥]𝜑))
35 sbsbc 3472 . . . . . . 7 ([𝑦 / 𝑥]𝜑[𝑦 / 𝑥]𝜑)
36 cbvralcsf.4 . . . . . . . 8 𝑥𝜓
37 cbvralcsf.6 . . . . . . . 8 (𝑥 = 𝑦 → (𝜑𝜓))
3836, 37sbie 2436 . . . . . . 7 ([𝑦 / 𝑥]𝜑𝜓)
3935, 38bitr3i 266 . . . . . 6 ([𝑦 / 𝑥]𝜑𝜓)
4034, 39syl6bb 276 . . . . 5 (𝑧 = 𝑦 → ([𝑧 / 𝑥]𝜑𝜓))
4133, 40imbi12d 333 . . . 4 (𝑧 = 𝑦 → ((𝑧𝑧 / 𝑥𝐴[𝑧 / 𝑥]𝜑) ↔ (𝑦𝐵𝜓)))
4218, 19, 41cbval 2307 . . 3 (∀𝑧(𝑧𝑧 / 𝑥𝐴[𝑧 / 𝑥]𝜑) ↔ ∀𝑦(𝑦𝐵𝜓))
4311, 42bitri 264 . 2 (∀𝑥(𝑥𝐴𝜑) ↔ ∀𝑦(𝑦𝐵𝜓))
44 df-ral 2946 . 2 (∀𝑥𝐴 𝜑 ↔ ∀𝑥(𝑥𝐴𝜑))
45 df-ral 2946 . 2 (∀𝑦𝐵 𝜓 ↔ ∀𝑦(𝑦𝐵𝜓))
4643, 44, 453bitr4i 292 1 (∀𝑥𝐴 𝜑 ↔ ∀𝑦𝐵 𝜓)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wal 1521   = wceq 1523  wnf 1748  [wsb 1937  wcel 2030  {cab 2637  wnfc 2780  wral 2941  [wsbc 3468  csb 3566
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-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ral 2946  df-sbc 3469  df-csb 3567
This theorem is referenced by:  cbvrexcsf  3599  cbvralv2  3602
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