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Theorem bj-sbceqgALT 35087
Description: Distribute proper substitution through an equality relation. Alternate proof of sbceqg 4343. (Contributed by BJ, 6-Oct-2018.) Proof modification is discouraged to avoid using sbceqg 4343, but the Metamath program "MM-PA> MINIMIZE_WITH * / EXCEPT sbceqg" command is ok. (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
bj-sbceqgALT (𝐴𝑉 → ([𝐴 / 𝑥]𝐵 = 𝐶𝐴 / 𝑥𝐵 = 𝐴 / 𝑥𝐶))

Proof of Theorem bj-sbceqgALT
Dummy variable 𝑦 is distinct from all other variables.
StepHypRef Expression
1 dfcleq 2731 . . . . . 6 (𝐵 = 𝐶 ↔ ∀𝑦(𝑦𝐵𝑦𝐶))
21sbcth 3731 . . . . 5 (𝐴𝑉[𝐴 / 𝑥](𝐵 = 𝐶 ↔ ∀𝑦(𝑦𝐵𝑦𝐶)))
3 sbcbig 3770 . . . . 5 (𝐴𝑉 → ([𝐴 / 𝑥](𝐵 = 𝐶 ↔ ∀𝑦(𝑦𝐵𝑦𝐶)) ↔ ([𝐴 / 𝑥]𝐵 = 𝐶[𝐴 / 𝑥]𝑦(𝑦𝐵𝑦𝐶))))
42, 3mpbid 231 . . . 4 (𝐴𝑉 → ([𝐴 / 𝑥]𝐵 = 𝐶[𝐴 / 𝑥]𝑦(𝑦𝐵𝑦𝐶)))
5 sbcal 3780 . . . 4 ([𝐴 / 𝑥]𝑦(𝑦𝐵𝑦𝐶) ↔ ∀𝑦[𝐴 / 𝑥](𝑦𝐵𝑦𝐶))
64, 5bitrdi 287 . . 3 (𝐴𝑉 → ([𝐴 / 𝑥]𝐵 = 𝐶 ↔ ∀𝑦[𝐴 / 𝑥](𝑦𝐵𝑦𝐶)))
7 sbcbig 3770 . . . 4 (𝐴𝑉 → ([𝐴 / 𝑥](𝑦𝐵𝑦𝐶) ↔ ([𝐴 / 𝑥]𝑦𝐵[𝐴 / 𝑥]𝑦𝐶)))
87albidv 1923 . . 3 (𝐴𝑉 → (∀𝑦[𝐴 / 𝑥](𝑦𝐵𝑦𝐶) ↔ ∀𝑦([𝐴 / 𝑥]𝑦𝐵[𝐴 / 𝑥]𝑦𝐶)))
9 sbcel2 4349 . . . . . 6 ([𝐴 / 𝑥]𝑦𝐵𝑦𝐴 / 𝑥𝐵)
109a1i 11 . . . . 5 (𝐴𝑉 → ([𝐴 / 𝑥]𝑦𝐵𝑦𝐴 / 𝑥𝐵))
11 sbcel2 4349 . . . . . 6 ([𝐴 / 𝑥]𝑦𝐶𝑦𝐴 / 𝑥𝐶)
1211a1i 11 . . . . 5 (𝐴𝑉 → ([𝐴 / 𝑥]𝑦𝐶𝑦𝐴 / 𝑥𝐶))
1310, 12bibi12d 346 . . . 4 (𝐴𝑉 → (([𝐴 / 𝑥]𝑦𝐵[𝐴 / 𝑥]𝑦𝐶) ↔ (𝑦𝐴 / 𝑥𝐵𝑦𝐴 / 𝑥𝐶)))
1413albidv 1923 . . 3 (𝐴𝑉 → (∀𝑦([𝐴 / 𝑥]𝑦𝐵[𝐴 / 𝑥]𝑦𝐶) ↔ ∀𝑦(𝑦𝐴 / 𝑥𝐵𝑦𝐴 / 𝑥𝐶)))
156, 8, 143bitrd 305 . 2 (𝐴𝑉 → ([𝐴 / 𝑥]𝐵 = 𝐶 ↔ ∀𝑦(𝑦𝐴 / 𝑥𝐵𝑦𝐴 / 𝑥𝐶)))
16 dfcleq 2731 . 2 (𝐴 / 𝑥𝐵 = 𝐴 / 𝑥𝐶 ↔ ∀𝑦(𝑦𝐴 / 𝑥𝐵𝑦𝐴 / 𝑥𝐶))
1715, 16bitr4di 289 1 (𝐴𝑉 → ([𝐴 / 𝑥]𝐵 = 𝐶𝐴 / 𝑥𝐵 = 𝐴 / 𝑥𝐶))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wal 1537   = wceq 1539  wcel 2106  [wsbc 3716  csb 3832
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2709
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-tru 1542  df-fal 1552  df-ex 1783  df-nf 1787  df-sb 2068  df-clab 2716  df-cleq 2730  df-clel 2816  df-nfc 2889  df-v 3434  df-sbc 3717  df-csb 3833  df-dif 3890  df-nul 4257
This theorem is referenced by: (None)
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