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intersection(seq, seq)
the intersection function, takes element-wise min of the coefficients
it generalizes standard set intersection where the coefficients are either 0 or 1
ie, it is a fuzzy set intersection

-- set intersection of {a,b,c,d} and {b,d,e,f,g}:
intersection(split |abcd>, split |bdefg>)
    |b> + |d>

-- fuzzy set intersection example:
intersection(3|a> + 1.2|b>, 3.5|a> + 0.9|b> + 5.13|c>)
    3|a> + 0.900000|b>

-- sequence intersection example:
intersection( ssplit |abcde>, ssplit |abc>)
    |a> . |b> . |c>