description: union(seq, seq) union(seq, seq, seq) the union function takes element-wise max of the coefficients examples: union(|a>, |b>, |c>) |a> + |b> + |c> union(3|a> + 1.2|b>, 3.5|a> + 0.9|b> + 5.13|c>) 3.5|a> + 1.2|b> + 5.13|c> union(|a1> + |a2> . 0.3|b1> + 0.5|b2>, 3|a1> + 0.9|a2> . 0.7|b2>) 3|a1> + |a2> . 0.3|b1> + 0.7|b2> see also: intersection, complement, subset, mbr