description: subset(one, two) returns the degree of subsetness of one with respect to two where one and two are superpositions examples: subset(|b>, |a> + |b> + |c>) |subset> subset(|c>, 0.3|a> + 2|b> + 9.7|c> + 13|d>) |subset> subset(|b> + |d>, |a> + |b> + |c>) 0.5|subset> see also: is-subset, mbr, is-mbr