Here is the python (yeah, trivial):

def subset(one,two): if one.count_sum() == 0: # prevent div by 0. return ket("",0) value = intersection(one,two).count_sum()/one.count_sum() return ket("subset",value)And here are some simple examples in the console:

-- full subset: sa: subset(|b>,|a> + |b> + |c>) |subset> -- partial subset: sa: subset(|a>,0.8|a>) 0.8|subset> -- another partial subset: sa: subset(|a> + |d>,|a> + |b> + |c>) 0.5|subset> -- another full subset: sa: subset(|b> + |d> + |e> + |f>,|a> + |b> + |c> + |d> + |e> + |f> + |g> + |h>) |subset> -- another full subset, this one with coeffs other than just 0 and 1: sa: subset(0.8|a> + 3|b> + 7|c> + 0.2|d>,|a> + 4|b> + 7|c> + 5|d> + 37|e>) |subset> -- not at all a subset: sa: subset(|d> + |e> + |f>,|a> + |b> + |c>) 0|subset>I guess that is it. I hope that is clear enough. Now, I don't yet know where I will use it, but presumably it will be useful!

And an observation. I guess one interpretation of subset(SP1,SP2) == 1 is that for every point of a "curve" in SP1, its value is bounded by (ie, less than or equal) the value of SP2 at that same point. I suspect this will be an interesting idea.

BTW, this post was partly motivated by multi-sets. Though multi-sets can be considered a subset of superpositions, since the latter can have non-integer coeffs.

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