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Theorem dfsb7a 1867
Description: An alternative definition of proper substitution df-sb 1643. Similar to dfsb7 1864 in that it involves a dummy variable , but expressed in terms of rather than . For a version which only requires  F/ rather than and being distinct, see sb7af 1866. (Contributed by Jim Kingdon, 5-Feb-2018.)
Assertion
Ref Expression
dfsb7a
Distinct variable groups:   ,   ,   ,
Allowed substitution hints:   (,)

Proof of Theorem dfsb7a
StepHypRef Expression
1 nfv 1418 . 2  F/
21sb7af 1866 1
Colors of variables: wff set class
Syntax hints:   wi 4   wb 98  wal 1240  wsb 1642
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 629  ax-5 1333  ax-7 1334  ax-gen 1335  ax-ie1 1379  ax-ie2 1380  ax-8 1392  ax-10 1393  ax-11 1394  ax-i12 1395  ax-bnd 1396  ax-4 1397  ax-17 1416  ax-i9 1420  ax-ial 1424  ax-i5r 1425
This theorem depends on definitions:  df-bi 110  df-nf 1347  df-sb 1643
This theorem is referenced by: (None)
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