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Theorem bnj610 31334
Description: Pass from equality (𝑥 = 𝐴) to substitution ([𝐴 / 𝑥]) without the distinct variable restriction ($d 𝐴 𝑥). (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) (New usage is discouraged.)
Hypotheses
Ref Expression
bnj610.1 𝐴 ∈ V
bnj610.2 (𝑥 = 𝐴 → (𝜑𝜓))
bnj610.3 (𝑥 = 𝑦 → (𝜑𝜓′))
bnj610.4 (𝑦 = 𝐴 → (𝜓′𝜓))
Assertion
Ref Expression
bnj610 ([𝐴 / 𝑥]𝜑𝜓)
Distinct variable groups:   𝑦,𝐴   𝜑,𝑦   𝜓,𝑦   𝑥,𝜓′   𝑥,𝑦
Allowed substitution hints:   𝜑(𝑥)   𝜓(𝑥)   𝐴(𝑥)   𝜓′(𝑦)

Proof of Theorem bnj610
StepHypRef Expression
1 vex 3388 . . . 4 𝑦 ∈ V
2 bnj610.3 . . . 4 (𝑥 = 𝑦 → (𝜑𝜓′))
31, 2sbcie 3668 . . 3 ([𝑦 / 𝑥]𝜑𝜓′)
43sbcbii 3689 . 2 ([𝐴 / 𝑦][𝑦 / 𝑥]𝜑[𝐴 / 𝑦]𝜓′)
5 sbcco 3656 . 2 ([𝐴 / 𝑦][𝑦 / 𝑥]𝜑[𝐴 / 𝑥]𝜑)
6 bnj610.1 . . 3 𝐴 ∈ V
7 bnj610.4 . . 3 (𝑦 = 𝐴 → (𝜓′𝜓))
86, 7sbcie 3668 . 2 ([𝐴 / 𝑦]𝜓′𝜓)
94, 5, 83bitr3i 293 1 ([𝐴 / 𝑥]𝜑𝜓)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 198   = wceq 1653  wcel 2157  Vcvv 3385  [wsbc 3633
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1891  ax-4 1905  ax-5 2006  ax-6 2072  ax-7 2107  ax-9 2166  ax-10 2185  ax-11 2200  ax-12 2213  ax-13 2377  ax-ext 2777
This theorem depends on definitions:  df-bi 199  df-an 386  df-or 875  df-3an 1110  df-tru 1657  df-ex 1876  df-nf 1880  df-sb 2065  df-clab 2786  df-cleq 2792  df-clel 2795  df-v 3387  df-sbc 3634
This theorem is referenced by:  bnj611  31505  bnj1000  31528
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