In the theory of surfaces we transform from one set of three rectangular axes to another by the substitutions 'X=' by+ cz, Y = a'x + b'y + c'z, Z =a"x+b"y-l-c"z, where X 2+Y2+Z2 = x2+ y2+z2.
Such a symbolic product, if its does not vanish identically, denotes an invariant or a covariant, according as factors az, bz, cz,...
C or cz is pronounced as English ts; cs as English ch; ds as English j; zs as French j; gy as dy.
These often agree with CZ against M, and the readings of CZZ are generally superior.
Labels such as Biscotti, Baby CZ, D&G and Chloe manufacture adorable, high quality designs, none of which are particularly over-the-top when it comes to fashion, but include just enough pink and ruffles to make an adorable ensemble.
