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Theorem sb6a 2116
Description: Equivalence for substitution. (Contributed by NM, 5-Aug-1993.)
Assertion
Ref Expression
sb6a
Distinct variable group:   ,
Allowed substitution hints:   (,)

Proof of Theorem sb6a
StepHypRef Expression
1 sb6 2099 . 2
2 sbequ12 1919 . . . . 5
32equcoms 1681 . . . 4
43pm5.74i 236 . . 3
54albii 1566 . 2
61, 5bitri 240 1
Colors of variables: wff setvar class
Syntax hints:   wi 4   wb 176  wal 1540  wsb 1648
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925
This theorem depends on definitions:  df-bi 177  df-an 360  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649
This theorem is referenced by: (None)
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