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Theorem sbco3v 1843
Description: Version of sbco3 1848 with a distinct variable constraint between  x and  y. (Contributed by Jim Kingdon, 19-Feb-2018.)
Assertion
Ref Expression
sbco3v  |-  ( [ z  /  y ] [ y  /  x ] ph  <->  [ z  /  x ] [ x  /  y ] ph )
Distinct variable group:    x, y
Allowed substitution hints:    ph( x, y, z)

Proof of Theorem sbco3v
StepHypRef Expression
1 nfs1v 1815 . . . 4  |-  F/ x [ y  /  x ] ph
21nfri 1412 . . 3  |-  ( [ y  /  x ] ph  ->  A. x [ y  /  x ] ph )
32sbco2v 1821 . 2  |-  ( [ z  /  x ] [ x  /  y ] [ y  /  x ] ph  <->  [ z  /  y ] [ y  /  x ] ph )
4 sbco 1842 . . 3  |-  ( [ x  /  y ] [ y  /  x ] ph  <->  [ x  /  y ] ph )
54sbbii 1648 . 2  |-  ( [ z  /  x ] [ x  /  y ] [ y  /  x ] ph  <->  [ z  /  x ] [ x  /  y ] ph )
63, 5bitr3i 175 1  |-  ( [ z  /  y ] [ y  /  x ] ph  <->  [ z  /  x ] [ x  /  y ] ph )
Colors of variables: wff set class
Syntax hints:    <-> wb 98   [wsb 1645
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 630  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-10 1396  ax-11 1397  ax-i12 1398  ax-4 1400  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428
This theorem depends on definitions:  df-bi 110  df-nf 1350  df-sb 1646
This theorem is referenced by:  sbcomv  1845
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