ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  wsb GIF version

Syntax Definition wsb 1645
Description: Extend wff definition to include proper substitution (read "the wff that results when 𝑦 is properly substituted for 𝑥 in wff 𝜑"). (Contributed by NM, 24-Jan-2006.)
Hypotheses
Ref Expression
wph wff 𝜑
vx setvar 𝑥
vy setvar 𝑦
Assertion
Ref Expression
wsb wff [𝑦 / 𝑥]𝜑

See definition df-sb 1646 for more information.

Colors of variables: wff set class
  Copyright terms: Public domain W3C validator