let C be non empty set ; :: thesis: for s, t being Element of (FuzzyLattice C) holds s "\/" t = max (@ s),(@ t)
let s, t be Element of (FuzzyLattice C); :: thesis: s "\/" t = max (@ s),(@ t)
( C,(@ s) @ = s & C,(@ t) @ = t ) ;
hence s "\/" t = max (@ s),(@ t) by Th18; :: thesis: verum