Question: Show that if R and S are both n-ary relations, then Pi1,i2,...,im(R S) = Pi1,i2,...,im(R) Pi1,i2,...,im(S).

Show that if R and S are both n-ary relations, then Pi1,i2,...,im(R ∪ S) = Pi1,i2,...,im(R) ∪ Pi1,i2,...,im(S).

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