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Theorem sb4b 2054
Description: Simplified definition of substitution when variables are distinct. (Contributed by NM, 27-May-1997.)
Assertion
Ref Expression
sb4b

Proof of Theorem sb4b
StepHypRef Expression
1 sb4 2053 . 2
2 sb2 2023 . 2
31, 2impbid1 194 1
Colors of variables: wff setvar class
Syntax hints:   wn 3   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:  nfsb4t  2080  sbcom  2089  sbcom2  2114
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