science_man_88

powerset

May 23rd, 2017
765
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  1.  Powerset(S)=my(b=apply(r->Vec(r),S));for(x=2,#S,b=setbinop((x,y)->if(x!=Vec(y),concat(x,y),concat(x,[])),b,S));b=concat([[]],select(r->r==vecsort(r,,8),b))
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