howard hanson called this operation of commutative mathematical convolution "superposition" or "@-projection" and used the "/" notation interchangeably. thus "p@m" or "p/m" means "perfect fifth at major third", e.g.: { c e g b }. he specifically noted that two triad forms could be so multiplied, or a triad multiplied by itself, to produce a resultant scale. the latter "squaring" of a triad produces a particular scale highly saturated in instances of the source triad . thus "pmn", hanson's name for common the major triad, when squared, is "pmn", e.g.: { c d e g g b }.