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Theorem sbccom2f 35291
Description: Commutative law for double class substitution, with nonfree variable condition. (Contributed by Giovanni Mascellani, 31-May-2019.)
Hypotheses
Ref Expression
sbccom2f.1 𝐴 ∈ V
sbccom2f.2 𝑦𝐴
Assertion
Ref Expression
sbccom2f ([𝐴 / 𝑥][𝐵 / 𝑦]𝜑[𝐴 / 𝑥𝐵 / 𝑦][𝐴 / 𝑥]𝜑)
Distinct variable group:   𝑥,𝑦
Allowed substitution hints:   𝜑(𝑥,𝑦)   𝐴(𝑥,𝑦)   𝐵(𝑥,𝑦)

Proof of Theorem sbccom2f
Dummy variable 𝑧 is distinct from all other variables.
StepHypRef Expression
1 sbcco 3802 . . . 4 ([𝐵 / 𝑧][𝑧 / 𝑦]𝜑[𝐵 / 𝑦]𝜑)
21bicomi 225 . . 3 ([𝐵 / 𝑦]𝜑[𝐵 / 𝑧][𝑧 / 𝑦]𝜑)
32sbcbii 3833 . 2 ([𝐴 / 𝑥][𝐵 / 𝑦]𝜑[𝐴 / 𝑥][𝐵 / 𝑧][𝑧 / 𝑦]𝜑)
4 sbccom2f.1 . . 3 𝐴 ∈ V
54sbccom2 35290 . 2 ([𝐴 / 𝑥][𝐵 / 𝑧][𝑧 / 𝑦]𝜑[𝐴 / 𝑥𝐵 / 𝑧][𝐴 / 𝑥][𝑧 / 𝑦]𝜑)
6 vex 3503 . . . . . . 7 𝑧 ∈ V
76sbccom2 35290 . . . . . 6 ([𝑧 / 𝑦][𝐴 / 𝑥]𝜑[𝑧 / 𝑦𝐴 / 𝑥][𝑧 / 𝑦]𝜑)
8 sbccom2f.2 . . . . . . . 8 𝑦𝐴
96, 8csbgfi 3907 . . . . . . 7 𝑧 / 𝑦𝐴 = 𝐴
10 dfsbcq 3778 . . . . . . 7 (𝑧 / 𝑦𝐴 = 𝐴 → ([𝑧 / 𝑦𝐴 / 𝑥][𝑧 / 𝑦]𝜑[𝐴 / 𝑥][𝑧 / 𝑦]𝜑))
119, 10ax-mp 5 . . . . . 6 ([𝑧 / 𝑦𝐴 / 𝑥][𝑧 / 𝑦]𝜑[𝐴 / 𝑥][𝑧 / 𝑦]𝜑)
127, 11bitri 276 . . . . 5 ([𝑧 / 𝑦][𝐴 / 𝑥]𝜑[𝐴 / 𝑥][𝑧 / 𝑦]𝜑)
1312bicomi 225 . . . 4 ([𝐴 / 𝑥][𝑧 / 𝑦]𝜑[𝑧 / 𝑦][𝐴 / 𝑥]𝜑)
1413sbcbii 3833 . . 3 ([𝐴 / 𝑥𝐵 / 𝑧][𝐴 / 𝑥][𝑧 / 𝑦]𝜑[𝐴 / 𝑥𝐵 / 𝑧][𝑧 / 𝑦][𝐴 / 𝑥]𝜑)
15 sbcco 3802 . . 3 ([𝐴 / 𝑥𝐵 / 𝑧][𝑧 / 𝑦][𝐴 / 𝑥]𝜑[𝐴 / 𝑥𝐵 / 𝑦][𝐴 / 𝑥]𝜑)
1614, 15bitri 276 . 2 ([𝐴 / 𝑥𝐵 / 𝑧][𝐴 / 𝑥][𝑧 / 𝑦]𝜑[𝐴 / 𝑥𝐵 / 𝑦][𝐴 / 𝑥]𝜑)
173, 5, 163bitri 298 1 ([𝐴 / 𝑥][𝐵 / 𝑦]𝜑[𝐴 / 𝑥𝐵 / 𝑦][𝐴 / 𝑥]𝜑)
Colors of variables: wff setvar class
Syntax hints:  wb 207   = wceq 1530  wcel 2107  wnfc 2966  Vcvv 3500  [wsbc 3776  csb 3887
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1904  ax-6 1963  ax-7 2008  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2153  ax-12 2169  ax-13 2385  ax-ext 2798
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 844  df-tru 1533  df-ex 1774  df-nf 1778  df-sb 2063  df-clab 2805  df-cleq 2819  df-clel 2898  df-nfc 2968  df-v 3502  df-sbc 3777  df-csb 3888
This theorem is referenced by:  sbccom2fi  35292
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