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Artusartos
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Homework Statement
I attached the question...
I'm having trouble proving the closure property of the addition operation.
Homework Equations
The Attempt at a Solution
Since the textbook states "The Boolean group B(X) is the family of all the subsets of X"
I need to show that if A is in B(X) and B is in B(X), then A+B is in B(X). But I'm not sure how...since both A and B are subsets of X, I need to show that A+B is a subset...but X is just arbitrary. I'm a bit confused about this...
Thanks in advance
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