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Theorem xchbinxr 302
Description: Replacement of a subexpression by an equivalent one. (Contributed by Wolf Lammen, 27-Sep-2014.)
Hypotheses
Ref Expression
xchbinxr.1
xchbinxr.2
Assertion
Ref Expression
xchbinxr

Proof of Theorem xchbinxr
StepHypRef Expression
1 xchbinxr.1 . 2
2 xchbinxr.2 . . 3
32bicomi 193 . 2
41, 3xchbinx 301 1
Colors of variables: wff setvar class
Syntax hints:   wn 3   wb 176
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 177
This theorem is referenced by:  3anor  948  nanbi  1294  2nalexn  1573  ralnex  2624  rexnal  2625  nss  3329  difdif  3392  difab  3523  ssdif0  3609  difin0ss  3616  disjsn  3786  iundif2  4033  iindif2  4035  tfinsuc  4498
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