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Syntax Definition wsb 1642
Description: Extend wff definition to include proper substitution (read "the wff that results when is properly substituted for in wff "). (Contributed by NM, 24-Jan-2006.)
Hypotheses
Ref Expression
wph
vx  setvar
vy  setvar
Assertion
Ref Expression
wsb

See definition df-sb 1643 for more information.

Colors of variables: wff set class
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