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Calculating Powersets

Posted 9 years ago

I have to sets A={1,2,3} and B={a,b,c,d,e}. I want the set of subsets of elements from both A and B that contain at least one element of A and one element of B. I wanted to calculate it using the following formula:

P(A?B)?(P(A)?P(B))

I tried the following query:

Subsets[{1,2,3} union {a,b,c,d,e}]/(Subsets[{1,2,3}] union Subsets[{a,b,c,d,e}])

But, unfortunately, Wolframalpha doesn't understand my query.

Is there any other way?

POSTED BY: dolbik

Try explicitly using the named Wolfram language functions Union and Complement with square brackets.

In Mathematica the following works (dropping the empty set):

Complement[Subsets[{1, 2, 3, a, b, c, d, e}], {#} & /@ {1, 2, 3, a, b, c, d, e}]
POSTED BY: David Gathercole
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